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Farklı Yetişme Koşullarında Yetişen Bazı Odunsu Türlerde Yaprak Mikromorfolojik Karakterlerinin Değişimi
Abstract
Bu çalışmada, doğal yayılış alanında yetişen bazı odunsu bitkilerdeki stomatal karakterlerin tür ve fitocografik bölgeye bağlı değişiminin belirlenmesi amaçlanmıştır. Bu amaçla Türkiye’de Akdeniz Fitocoğrafik Bölgesi, Avrupa-Sibirya Fitocoğrafik Bölgesi ve İran-Turan Fitocoğrafik Bölgesinde yayılış gösteren Acer negondo L., Berberis thunbergii DC., Populus alba L. ve Rhus coriaria L. türlerinden yaprak numuneleri alınmıştır. Yapraklardan elektron mikroskopu yardımıyla alınan görüntüler üzerinde ImageJ programı yardımıyla ölçümler yapılarak stoma eni, stoma boyu, stomapor eni ve stomapor boyu belirlenmiştir. Çalışma sonuçları çalışmaya konu karakterlerin tür ve fitocoğrafik bölgeye bağlı olarak belirgin bir değişiminin olmadığını ortaya koymaktadır. Bu sonuç türlerin genetik varyasyonunun geniş olması veya mikro çevre koşullarının baskın olması ile açıklanabilmektedir.
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Morphological measurements of Anatolian chestnut (Castanea sativa Mill.) leaves were done within the borders of Abana district of Kastamonu province. The study was conducted using mixed (oak, beech, hornbeam, black pine, and yellow pine) medium (41% to 70%) and fully closed (71% to 100%) stands. Some leaf parameters, such as leaf blade width, petiole length, leaf blade length, leaf length, distance between lateral veins, teeth width, teeth length, the angle between the leaf base and the petiole, and the angle between the midrib and lateral veins, were measured. Moreover, stomata of the leaves picked up from precise altitudes were observed under a scanning electron microscope. The differences between fibre elevation, fibre wall thickness, elasticity coefficient, rigidity coefficient, Muhlstep rate, and Runkel ratio were found in the wood samples taken from different altitude zones. It was found that altitude did not affect leaf blade width, fibre length, fibre width, felting ratio, and lumen width. However, it was determined that altitude affected other studied characteristics.
The complex of beech taxa in western Eurasia (Fagus sylvatica L. s.l.) represents one of the most widespread broad-leaved trees in the temperate forests of the northern hemisphere. Two subspecies are generally recognized, F. sylvatica ssp. sylvatica in Europe and F. sylvatica ssp. orientalis in southwestern Asia, but several strongly differentiated regional populations were identified within this complex. To reveal geographical and genomic patterns of hybridization and introgression,
genetic variation at 6789 single-nucleotide polymorphisms (SNP) resulting from ddRAD sequencing was studied in 288 specimens representing 207 populations distributed across the whole range. Two clusters resulting from a Bayesian analysis
of population Structure well coincided with the subspecies, while increasing the number of clusters allowed to distinguish divergent lineages within subspecies. Two zones of potential hybridization between such lineages were analyzed: western
Balkans at the contact of both subspecies and the Alpine area at the contact of populations coming from different glacial refugia. Geographical distribution of hybrid indices in the Balkan hybrid zone indicates asymmetric gene flow preferentially directed from F. orientalis to F. sylvatica. Eight SNPs showed a significant shift of genomic cline centers, seven of them toward excess F. orientalis ancestry, suggesting that introgression irregularly affects different regions of the beech genome. On the other hand, no genomic cline outliers were found in the Alpine hybrid zone. Implications for assisted gene flow are shortly discussed.
Seed orchards with high hereditary qualities and the improvement studies used are of great importance. This study was carried out on individuals in a Boyabat grafted black pine seed orchard, Sinop. The morphological and micromorphological measurements of the characteristics were performed on needle samples taken from individuals, and the genetic diversity was determined on a clonal basis. According to the analysis of variance applied to the data obtained from the measurements and the morphological and micromorphological characters of the clones, it was determined that there was a significant difference among the clones at the P<0.001 confidence level. In this context, according to Duncan’s Range test, the creation of a large number of groups is an indicator of it. The highest heritability rates were obtained in needle diameter, stipule diameter, number of the dorsal stoma, and needle length characteristics.
Çalışmanın amacı: Bu çalışmada, Eşleştirilmiş Model Karşılaştırılma Projesinin iklim değişikliği senaryoları kapsamında (SSPs 245 ve SSPs 585) çalışma alanının mevcut durum ve gelecekteki (günümüz, 2040, 2060, 2080) iklim değişikliklerinin belirlemesi amaçlamıştır. Çalışmanın alanı: Çalışmaya konu alan Samsun ilidir. Materyal ve yöntem: Güncel iklim verileri Meteoroloji Genel Müdürlüğü'ne bağlı 24 meteoroloji istasyonu tarafından yapılan ölçümlerden elde edilmiştir. Bu verilerden elde edilen 2000-2020 dönemine ait ölçüm verileri kullanılarak, bu çalışma için “Ters Mesafe Ağırlıklı” yöntemi ile iklim haritaları hazırlanmıştır. Bu haritalara biyokonfor indeks formülleri uygulanarak biyokonfor haritaları elde edilmiştir. Temel sonuçlar: Bölgede günümüzde ortalama en düşük ve en yüksek sıcaklıklar yaklaşık olarak 7-24 °C arasında değişmektedir. İki senaryoya göre 2040 yılından 2080 yılına kadar sıcaklı 13-19 °C arasında değişecek ve daha sonra ilk senaryoya göre sabit kalırken ikinci senaryoya göre 2080-2100 arasında 19-25 °C’ye çıkacaktır. Sonuç olarak, bölge çok daha sıcak olacak ve 2100'de Samsun'da sıcak bölgeler olabilir. Araştırma vurguları: Samsun ilindeki biyokonfor bölgeleri, özellikle soğutma maliyetleri başta olmak üzere, yakında önemli ölçüde değişecek ve iklimlendirme sistemlerinin kullandığı gazlar ve enerji tüketimi nedeniyle küresel iklim değişikliğine olumsuz katkıda bulunacaktır.
Global climate change is considered an irreversible problem, which might directly or indirectly affect all the organisms and ecosystems on the earth and the world has to struggle with. Plants having no effective movement mechanism are the group that global climate change will affect the most. In order to minimize the species and population losses, it is important to estimate the changes in the available distribution areas of species and to ensure the migration mechanism, which the species will need, by the hand of humans. The present study aims to reveal how potential distribution areas of fir, which is among the significant tree species of Turkey and significant portion of global distribution of which is in Turkey, will change from an altitudinal aspect because of the climate change. The results achieved showed that, because of the effects of global climate change, the suitable distribution areas of Abies nordmanniana subsp. nordmanniana will significantly decrease especially at high altitudes and that suitable distribution areas of Abies nordmanniana subsp. equi-trojani will reduce at altitudes higher than 1400 m but increase generally at the altitudes between 200 and 600 m. Moreover, suitable distribution areas of Abies cilicica will shift towards higher altitudes.
Trace metal pollution is a vital issue in ecological problems (air, soil, and water), and it threatens human health in many urban areas worldwide. The accumulation of heavy metals released from various sources can readily occur on plants and impairs their growth. Therefore, monitoring metal concentration is extremely important when released into the atmosphere from one place to another urban environment. Biomonitor is one of the passive methods used to track selected elements. Chromium (Cr) has adverse effects on plants when it is in high concentrations; therefore, the variation of its concentration in plants is important to be assessed. Another target element, zinc (Zn), has different essential metabolic functions in plants and is crucial in protein and carbohydrate synthesis. It directly affects the plant due to its protein and carbohydrate synthesis role. This study aimed to determine the variation of the Cr and Zn concentration ratio in the organs of Picea pungens Engelm. from Ankara, Türkiye. According to organ, age, washing status, and location, Picea pungens Engelm. showed significant differences (p < 0.05) for Cr and Zn pollution on the road shoulders. Their location on the tree can easily determine the age of the needles and branches. The total values of bark for Cr and Zn were calculated as 23,887 ppb and 672,012 ppb in barks in unwashed samples. The result of the Cr and Zn content was significantly evaluated using ANOVA and Duncan test. The P. pungens is an excellent passive sampler as a biomonitor for the Cr and Zn distribution in the local atmospheric environment.
Urban air pollution in cities, among the world’s most critical problems, has escalated to such an extent that it threatens human health in many urban centers and causes the death of millions every year. Trace metals are significant among the components of air pollution. Trace metals can endure long without undergoing biodegradation and bioaccumulation in living organisms. Moreover, their concentration in the air increases gradually. Therefore, monitoring metal concentration is extremely important for reliable indicators of environmental pollution. Biomonitoring is an effective method for describing metal concentrations in urban areas. Chromium, manganese, and zinc, selected within the present study, have various adverse effects on plants in high concentrations. Their identification is highly critical for monitoring the pollution level in their regions. This study aimed to determine the Cr, Mn, and Zn concentration changes according to organ, and age in Elaeagnus angustifolia L., Platanus orientalis L., Koelreuteria paniculata Laxm, Ailanthus altissima (Mill.) Swingle, and Cedrus atlantica (Endl.) Manetti ex Carr is 30 years old. The accumulation of metals in the outer bark can be found as follows Zn > Mn > Cr in all species, although Ailanthus altissima (Mill.) Swingle and Platanus orientalis L. can be suitable for biomonitoring tools because concentrations change significantly depending on the airborne metal.
Economic and industrial development results in worldwide population concentration in cities, leading to increases in impervious surfaces. Thus, the surface temperatures increase and cities are exposed to the urban heat island effect. This study analyzed the changes in the urban heat island effect in the 30 years (from 1990 to 2021) in the central district of Bartin. In this sense, there were two primary goals. Firstly, land use/land cover change, land surface temperature (LST), normalized difference built-up index (NDBI), and normalized difference vegetation index (NDVI) were analyzed by using remote sensing methods between 1990 and 2021. Secondly, a linear regression analysis was conducted to determine the factors associated with LST, NDVI, and NDBI. The study results revealed increases in urban surfaces and the average land surface temperature values in the past 30 years and showed a decline in the vegetation. Regression analysis results indicated a strong negative relationship between LST and NDVI and a strong positive relationship between LST and NDBI. It was also found a robust negative relationship between NDBI and NDVI. In light of the findings, it was stated that the amount of open and green areas should be increased in order to prevent the negative effects of the urban heat island in the central district of Bartin. For this purpose, it has been proposed to encourage green roof systems throughout the city, to create city parks and to create a green belt system. In addition, as a result of the study, the importance of preventing forest destruction caused by over settlement in the Mountains, which is one of the rare habitats of the world with different plant species, was emphasized. In this sense, legal sanctions should be employed to protect those areas and prevent construction.
Heavy metals (HMs), among the components of air pollution that is one of the utmost critical concerns our world has faced, are one of the biggest threats to living organisms. The plants, as a biomonitor, offer the most effective solution in tracking the change of HM concentration on earth and taking them under control. This paper aimed to evaluate the differences in cadmium (Cd), iron (Fe), and aluminum (Al) concentrations by using the annual rings of a 180-year-old Corylus colurna L. tree, which was cut in late 2020. Moreover, HMs in outer and inner bark were also compared to the values found in wood, and the direction-based change in the concentrations of these HMs was examined. As a result, the concentrations statistically differed between wood and barks for all three elements only in the north side (p < 0.001), and bark samples had higher Cd, Fe, and Al element concentrations than wood. When examining the annual rings, the highest values were commonly observed in the western and northern sides, and there were notable differences between the directions in the same term. The difference is thought to be the effects of highway and steel and iron facility located at the nearest point. In conclusion, the results showed that the use of the species and monitoring method employed in this study were very appropriate for tracking the variation in Cd, Fe, and Al concentrations, and these HMs have almost no transfer between organs and cells of the Corylus colurna.
Climate is a factor that affects the entire life of humans such as physiological development and characteristics, housing and house structures, food and cloth selections, and distribution on land. It is projected that global climate change would cause important changes in climate parameters in near future and affect the lives of all organisms on the earth directly or indirectly. It is estimated that these changes would cause significant changes in biocomfort zones. Thus, it is important to determine the biocomfort zones depending on the climate change scenarios and to use them in urban planning studies. In this study, it was aimed to determine the change in bioclimatic comfort zones in Antalya depending on the projected climate change scenarios. Within the scope of this study, considering the SSPs 245 and SSPs 585 scenarios of Coupled Model Intercomparison Project Phase 6, that is the 6th assessment report of IPCC, it was aimed to determine the current status and possible changes in biocomfort zones in Antalya in years 2040, 2060, 2080, and 2100. The results showed that the comfort zones in Antalya will generally shift from cold to hot towards the year 2100, that this shift will be at important level, and that the highest level of increase will be seen in southern regions with high population density and intense touristic activities.
The principal problem in dense cities is air pollution and the damage to the environment caused by air pollution. Roadside landscape plants are exposed to air pollutants, especially in small urban centers caused by congested traffic, heating, and industrial enterprises. According to the type of landscape plants, being a good biomonitor varies according to their absorbing capacity of air pollutants. Chromium (Cr), cadmium (Cd), and zinc (Zn) are the leading pollutants originating from emissions. They are selected and negatively affect several landscape plants in high concentrations. This study aimed to determine their concentration changes according to organ and washing status by commonly used 14 landscape species in parks. The heavy metal holding capacity of 14 species used was compared; chromium, cadmium, and zinc concentrations changed significantly depending on the factors evaluated to adsorb them. The ranking of the accumulation levels was determined as Zn > Cr > Cd and was detected at higher levels in unwashed organs than in the others. Chamaecyparis lawsoniana (A. Murr.) Parl. was shown better biomonitoring features on heavy metal accumulation among all species. Its unwashed leaves’ deposited Cd, Cr, and Zn were 154 ppb, 6400 ppb, and 39,940 ppb, respectively.
Bedding plants in the nursery phase are often subject to drought stress because of the small volume of the containers and the hydraulic conductivity of organic substrates used. To analyse the morphological, physiological, and enzymatic responses of zinnia (Zinnia elegans L.) plants at different irrigation levels, four treatments were performed: irrigated at 100% (100% field capacity, FC); light deficit irrigation (75% FC), medium deficit irrigation (50% FC), and severe deficit irrigation (25% FC). The growth of zinnia was significantly influenced by drought stress treatments. Different morphological parameters (dry biomass, leaf number, root to shoot ratio (R/S)) were modified only in the more severe drought stress treatment (25% FC). The stomata density increased in 50% FC and 25% FC, while the stomata size was reduced in 25% FC. The net photosynthesis, stomatal conductance, and transpiration were reduced in 50% FC and 25% FC. The relative water content (RWC) was reduced in 25% FC. Severe drought stress (25% FC) increased proline content up to seven-fold. Catalase (CAT), peroxidase (GPX), and superoxide dismutase (SOD) activity significantly increased in 50% FC and 25% FC. Principal component analysis (PCA) showed that the morphological and physiological parameters were mostly associated with the 100% FC and 75% FC treatments of the biplot, whereas the stomata density, R/S ratio, and antioxidant enzymes (GPX, CAT) were associated with 50% FC, and proline and DPPH were associated with 25% FC, respectively.
Climate-dependent changes in wood anatomical characteristics were studied for Rosa sp. and Nerium oleander sp. grown in phytosociological areas. For this purpose, wood samples were taken from the individual wood species grown in Antalya, Eskisehir, and Kastamonu provenances, where Terrestrial, Black Sea, and Mediterranean climate types prevail, and 11 anatomical characters were identified or calculated. As a result of the study, it has been determined that the climate has large effects on the characteristics that are the subject of the study and that each characteristic is at a higher level in individuals grown in areas where different climate types prevail. The highest values in Rosa species were obtained in the individuals grown under Terrestrial climate type in all characteristics except for LW (lumen widths), EC (elasticity coefficients), and FF (F-Factors.) Whereas in Nerium oleander, the highest values were obtained in individuals grown in the Mediterranean climate type in FL (fibre lengths), LW (lumen widths), FR (felting ratios), and EC (elasticity coefficients). For the same species type, in the Terrestrial climate, RIJID (rigidity coefficients), MUHT (Muhlstep ratios), and RUNK (Runkel ratios), and in the Black Sea climate DWT (double wall thicknesses) and WT (wall thicknesses) characteristics had high values.
Exhaustion of stratospheric ozone found at a height of 10–30 km around the world causes the solar UV-B (280–320 nm) radiation to penetrate through the atmosphere more, and thus to reach the Earth’s surface quicker. The protective ozone layer gets damaged by human activities constantly, and the increasing levels of UV radiation present threats to all life forms, plants, animals, and even microorganisms. However, the studies conducted on the effects of UV radiation on plants, and especially forest trees, are rather limited. In this study, it was aimed to identify the effects of UV-B radiation on some germination and seedling characteristics of Anatolian black pine seeds. Within the scope of the study, seeds were exposed to UV-B radiation for 5, 10, 20, 30, 40, 50, and 60 min for germination experiments; and the germination speed (GS) was calculated as the ratio of the germinated seeds to the solid seeds at the end of the 7th day, whereas the germination percentage (GP) was calculated as the ratio of the germinated seeds to the solid seeds at the end of the 35th day. The seeds reserved for the seedling experiment were exposed to UV-B radiation for 1, 3, 5, and 7 h. With the measurements made at the end of the day, the seedling length (SL), the terminal bud length (TBL), the branch number (BN), the root collar diameter (RCD), the stem fresh weight (SFW), the root fresh weight (RFW), the stem dry weight (SDW) and the root dry weight (RDW), and the rooting percentage (RP) were determined. Variance analysis and Duncan test were applied to the obtained data with the help of SPSS package program. The study results revealed that the exposure time to increased UV-B radiation significantly affected all characters; the least affected character was RP, and that the most affected characters were RDW, SDW, and RCD. As a result of the study, it was found that even the applications with the lowest intensity took effect in most of the characters, that the seedling development decreased by more than 80% in terms of some characters at the end of 7-h application, and that even the decrease in the RP character, which was the least affected by the 7-h UV-B application, was above 50%.
With the global climate anomalies and the destruction of ecological balance, the water shortage has become a serious ecological problem facing all mankind, and drought has become a key factor restricting the development of agricultural production. Therefore, it is essential to study the drought tolerance of crops. Based on previous studies, we reviewed the effects of drought stress on plant morphology and physiology, including the changes of external morphology and internal structure of root, stem, and leaf, the effects of drought stress on osmotic regulation substances, drought-induced proteins, and active oxygen metabolism of plants. In this paper, the main drought stress signals and signal transduction pathways in plants are described, and the functional genes and regulatory genes related to drought stress are listed, respectively. We summarize the above aspects to provide valuable background knowledge and theoretical basis for future agriculture, forestry breeding, and cultivation.
Fires pose a serious threat to the forests that lay on the western and southern coastline of Turkey that start with North Aegean coasts and end with the provincial boundaries of Hatay. Çanakkale, a western province of Turkey, is located in the North Aegean boundary and its topography (Dardanelles Strait), climate, and vegetation cover combine to form an inviting recipe to forest fires. Although the province is located in a transitional zone in terms of climate and vegetation, each year it witnesses highly dry and hot fire seasons. Thus, large forest fires occur periodically. In this research, the relationship between the large periodic fires (larger than 100 ha) and the climate data was investigated, with a particular focus on the most severe 8 fire seasons from 1969 to 2007. We established that there is a relationship between 1977, 1985, and 1986 fire seasons and the climate data for the corresponding periods. The remaining 5 seasons in which conflagrations occurred were also found to coincide with the days with high daily severity indices (DSR). These are 1969, 1977, 1985, 1987, and 2008. Additionally, 2008 was determined as the year with the highest fire risk, followed by year 1969.
In this study, we investigated the variability in morphological traits of seedlings from five Euonymus japonicus cultivars. We measured seedling heights, root collar diameters, leaf lengths and widths, root lengths, root numbers, and twig numbers of 60 seedlings from each cultivar. The E. japonicus cultivars Variegate and Green Rocket had the highest (95.8%) and lowest (70.3%) rooting percentages, respectively. With the exception of root lengths (p > 0.05), all morphological characteristics significantly differed among all cultivars (p < 0.05). In particular, the cultivar Green Rocket performed better than all other cultivars, with greater seedling heights and root collar diameters. These data warrant further studies for quantifying differences in traits among these cultivars.
Turkey has different habitat conditions resulting from a wide diversity of climatic and psychographical conditions. Different relationships of topography and climate have caused different geographical and ecological regions. These regional differences significantly affect the spread of plant species and determine distinct species’ compositions in different regions. Consequently, Turkey has high pure and mixed natural forests with biological and economic value in terms of both tree species and stand constitutions. Tending works done in the forests has also changed the relationship of light, temperature and humidity in the forest ecosystems.
As a result, soil and litter properties changed. Altitude, aspect, slope, topography and soil properties are effective factors for a habitat’s productivity. This present study was aimed at determining the properties of the soil and primary tree species located in the Taşköprü district of Kastamonu Province. Taşköprü district is located in the western Black Sea region of the Black Region and is geographically in the Euro-Siberian floristic region. Soil samples were taken from 15 different points, including 5 each from three different areas representing each tree species and from soils under different forest tree species (Scotch pine, black pine, oak) in the Taşköprü region. The stand characteristics of these species, such as age, height, diameter, frequency and litter condition, were measured in the field. Texture, pH, bulk density, organic matter, electrical conductivity (EC) and maximum water holding capacity were determined from the soil samples. These were evaluated for the different forest tree species and obtained soil analysis results.
This study examines the effect of light on the sapling forms of Turkish fir (Abies nordmanniana subsp. bornmulleriana), a species endemic to Turkey and extensively used in landscaping work. Needle samples were taken from seedlings grown in different light conditions. The samples were taken of one-, two-, and three-year-old main shoots and needles on the side branches. The samples were measured to determine needle length, needle diameter , and the number of stoma channels. The total number of 1 mm stoma area changes depending on the light conditions and position are determined. Analysis of Variance and Duncan tests were applied to the obtained data, and results were evaluated. In all the needles, most of the increase in needle position and needle length was determined to be due to the light. The curve of stomas was drawn depending on the light channels and the total number of stoma. The highest value was reached in semi-shade conditions.
The reduction in the precipitation level and the occurrence of frequent drought will be among the top future worries for humans to tackle on this planet. Globally 80% of the agricultural land area is rainfed. According to current research and predictions of frequent drought in the future, there will be a substantial reduction in the economic yield of crop plants, a major threat to food security. Drought tolerance is a major economic consideration to yield. Various biological processes are getting affected by low water stress. Photosynthesis which is an essential biological process for the survival of plants is getting majorly influenced. However, plants have some inbuilt mechanisms to respond to drought stress to some extent. In this mini review, we have highlighted the impact of drought on crop plants, its impact on photosynthesis and responses of plants to drought stress. Understanding mechanism of drought stress tolerance will lead towards development of drought tolerance in crop plants.
Scientific evidence suggests forest cover across the world is gradually decreasing whilst the world’s population is rapidly increasing. In line with this, the demand on raw wood is also increasing, making it impossible for the already limited natural resources to meet human needs in proportion to the increasing population size. To counter this, there is a need to increase the variety and availability of timber through genetic improvement. This has been seen in genetic improvement studies in forestry which have resulted in seed orchard establishments, however, the genetic variation in these seed orchards continues to be a topic of debate. This study aims to determine the clonal variation in chemical characteristics in Hanönü (Kastamonu) Günlüburun Black Pine (Pinus nigra Arnold. subsp. pallasiana (Lamb.) Holmboe) seed orchard. The analysis shows differences between the clones were seen at the 99.9% confidence level. Ash content, NaOH, extractive substance, and hot water solubility exhibited the highest heritability scores, according to the heritability estimates of the clones in the seed orchard. However, hemicellulose content showed an extremely low H2 (0.1).
Climate change, global warming and the deterioration of related environmental conditions cause an important problem for forest tree species. For this reason, it is necessary to determine the response of trees to these conditions. The objective of this study was to investigate the effects of water stress on seed germination of fifteen Pinus nigra Arnold. provenances in Turkey. For this purpose, the water stresses between 0 and -8.0 bars were obtained using polyethylene glycol-6000 (PEG) solutions. Seeds were kept for 35 days at 20 ± 0.5°C. In this study, significant variations between the provenances were found. Ankara Uluhan (% 95, 08) and Isparta Tota (% 85, 41) provenances at -8.0 bars having the highest cumulative germination percentages were the most resistant provenances against the water stress. This study has shown that the water stress reduced the germination speed, germination percentage and germination value.
Photosynthesis is the production of organic compounds by using luminous energy in living creatures having chlorophyll and the main factor is chlorophyll in photosynthesis having vital importance for living creatures. The amount of chlorophyll shows an alteration by being affected from many environmental factors. In this research, effects of insolation on amount of chlorophyll on leaves has been tried to determine by using Cornus mas, Cydonia oblonga, Robinia pseudoacacia which are totally 20 species. For this purpose, the aim is to determine change of amount of chlorophyll between leaves getting sun light all day along and leaves which grows in dark shadow conditions in these plants being grown in same region. According to the research results, it was seen that the amount of chlorophyll in leaves getting sun light is higher and except for Cydonia oblonga, Betula pendula, Ailanthus altissima and Lonicera tatarica, there was no a marked difference between measurement values.
Scarcity of water is a severe environmental constraint to plant productivity. Drought-induced loss in crop yield probably exceeds losses from all other causes, since both the severity and duration of the stress are critical. Here, we have reviewed the effects of drought stress on the growth, phenology, water and nutrient relations, photosynthesis, assimilate partitioning, and respiration in plants. This article also describes the mechanism of drought resistance in plants on a morphological, physiological and molecular basis. Various management strategies have been proposed to cope with drought stress. Drought stress reduces leaf size, stem extension and root proliferation, disturbs plant water relations and reduces water-use efficiency. Plants display a variety of physiological and biochemical responses at cellular and whole-organism levels towards prevailing drought stress, thus making it a complex phenomenon. CO2 assimilation by leaves is reduced mainly by stomatal closure, membrane damage and disturbed activity of various enzymes, especially those of CO2 fixation and adenosine triphosphate synthesis. Enhanced metabolite flux through the photorespiratory pathway increases the oxidative load on the tissues as both processes generate reactive oxygen species. Injury caused by reactive oxygen species to biological macromolecules under drought stress is among the major deterrents to growth. Plants display a range of mechanisms to withstand drought stress. The major mechanisms include curtailed water loss by increased diffusive resistance, enhanced water uptake with prolific and deep root systems and its efficient use, and smaller and succulent leaves to reduce the transpirational loss. Among the nutrients, potassium ions help in osmotic adjustment; silicon increases root endodermal silicification and improves the cell water balance. Low-molecular-weight osmolytes, including glycinebetaine, proline and other amino acids, organic acids, and polyols, are crucial to sustain cellular functions under drought. Plant growth substances such as salicylic acid, auxins, gibberrellins, cytokinin and abscisic acid modulate the plant responses towards drought. Polyamines, citrulline and several enzymes act as antioxidants and reduce the adverse effects of water deficit. At molecular levels several drought-responsive genes and transcription factors have been identified, such as the dehydration-responsive element-binding gene, aquaporin, late embryogenesis abundant proteins and dehydrins. Plant drought tolerance can be managed by adopting strategies such as mass screening and breeding, marker-assisted selection and exogenous application of hormones and osmoprotectants to seed or growing plants, as well as engineering for drought resistance.
Plant growth and productivity is adversely affected by nature's wrath in the form of various biotic and abiotic stress factors. Water deficit is one of the major abiotic stresses, which adversely affects crop growth and yield. These changes are mainly related to altered metabolic functions, one of those is either loss of or reduced synthesis of photosynthetic pigments. This results in declined light harvesting and generation of reducing powers, which are a source of energy for dark reactions of photosynthesis. These changes in the amounts of photosynthetic pigments are closely associated to plant biomass yield. This review describes some aspects of drought induced changes in morphological, physiological and pigments composition in higher plants.
Water, the most important component of life, is rapidly becoming a critically short commodity for humans and crop production. Limited water supply is one of the major abiotic factors that adversely affect agricultural crop production worldwide. Drought stress influences the normal physiology and growth of plants in many ways. It results in an increase of solute concentration outside the roots compared to the internal environment of the root and causes reverse osmosis. As a result, the cell membrane shrinks from the cell wall and may eventually lead to death of the cell. Water stress tends to shrink away from the interface with water-absorbing roots, creating a gap in the soil-plant-air continuum. As the plant continues to lose water via transpiration, water is drawn from root cells resulting in shrinkage of cell membranes and results in decreased integrity of the cell membrane and the living cell may be destroyed. Drought stress inhibits photosynthesis in plants by closing stomata and damaging the chlorophyll contents and photosynthetic apparatus. It disturbs the balance between the production of reactive oxygen species (ROS) and the antioxidant defence, causing accumulation of ROS which induces oxidative stress to proteins, membrane lipids and other cellular component. Mineral elements have numerous functions in plants including maintaining charge balance, electron carriers, structural components, enzyme activation, and providing osmoticum for turgor and growth .In this paper, an overview of some macronutrients (nitrogen, phosphorus, potassium, calcium and magnesium), micronutrients (Zinc, Boron, Copper) and silicon has been discussed in detail as how these nutrients play their role in decreasing the adverse effects of drought in crop plant.
Responses of plant leaf stomatal conductance and photosynthesis to water deficit have been extensively reported; however,
little is known concerning the relationships of stomatal density with regard to water status and gas exchange. The responses
of stomatal density to leaf water status were determined, and correlation with specific leaf area (SLA) in a photosynthetic study of a perennial grass, Leymus chinensis, subjected to different soil moisture contents. Moderate water deficits had positive effects on stomatal number, but more
severe deficits led to a reduction, described in a quadratic parabolic curve. The stomatal size obviously decreased with water
deficit, and stomatal density was positively correlated with stomatal conductance (gs), net CO2 assimilation rate (An), and water use efficiency (WUE). A significantly negative correlation of SLA with stomatal density was also observed, suggesting that the balance between leaf area and its matter may be associated with
the guard cell number. The present results indicate that high flexibilities in stomatal density and guard cell size will change
in response to water status, and this process may be closely associated with photosynthesis and water use efficiency.
Changes in rainfall and temperature brought about through climate change may affect plant species distribution and community composition of grasslands. The primary objective of this study was to test how manipulation of water and temperature would influence the plasticity of stomatal density and leaf area of bluebunch wheatgrass, Pseudoroegneria spicata. It was hypothesized that: (1) an increased water supply will increase biomass and leaf area and decrease stomatal density, while a reduced water supply will cause the opposite effect; (2) an increase in temperature will reduce biomass and leaf area and increase stomatal density; and (3) the combinations of water and temperature treatments can be aligned along a stress gradient and that stomatal density will be highest at high stress. Methods The three water supply treatments were (1) ambient, (2) increased approx. 30% more than ambient through weekly watering and (3) decreased approx. 30 % less than ambient by rain shades. The two temperature treatments were (1) ambient and (2) increased approx. 1-3 degrees C by using open-top chambers. At the end of the second experimental growing season, above-ground biomass was harvested, oven-dried and weighed, tillers from bluebunch wheatgrass plants sampled, and the abaxial stomatal density and leaf area of tillers were measured.
The first hypothesis was partially supported--reducing water supply increased stomatal density, but increasing water supply reduced leaf area. The second hypothesis was rejected. Finally, the third hypothesis could not be fully supported--rather than a linear response there appears to be a parabolic stomatal density response to stress.
Overall, the abaxial stomatal density and leaf area of bluebunch wheatgrass were plastic in their response to water and temperature manipulations. Although bluebunch wheatgrass has the potential to adapt to changing climate, the grass is limited in its ability to respond to a combination of reduced water and increased temperature.
Global climate change poses significant threats to ecosystems worldwide, particularly impacting long-lived forest tree species such as Pinus nigra. This study assessed the potential shifts in distribution areas for Pinus nigra, an important tree species, one highly vulnerable to global climate change, given its prevalence in continental climates, in Türkiye under different climate scenarios (SSPs 585 and 245). In this study, suitable distribution regions of Pinus nigra were evaluated based on SSPs 585 and SSPs 245 using nine different models. Results indicated potential losses in Pinus nigra distribution areas ranging from 15.0% to 43.5% (SSPs 245) and 19.7% to 48.9% (SSPs 585) by 2100. However, in 2100, new suitable distribution areas are expected to be formed at rates ranging from 13.8% to 32.1% and 15.1% to 34.4% according to the above scenarios. Because most of the newly formed suitable distribution regions are quite far from the areas where the species currently spreads, it seems necessary to provide the migration mechanism needed by the species by humans to prevent population losses in this process.
Aim of the study: In the process of global climate change (GCC), the migration mechanism needed especially for forest trees must be provided by humans. For this purpose, contrary to the previous studies, detailed studies to be carried out on small areas are needed. Area of study: In the present study carried out in Kastamonu Regional Directorate of Forestry, which performs the highest level of wood production in Türkiye, it was aimed to specify the actual distribution areas of the Abies and the change in their suitable distribution areas due to GCC. Material and methods: In this study, besides the existing distribution areas and the potential future distribution areas, also the suitable distribution areas were determined by using SSP 126, SSP 370, and SSP 585 scenarios for the years 2040, 2070, and 2100 for Abies at Kastamonu. Main results: The results achieved there showed that, depending on the results of climate change, distribution areas of Abies populations would change in the future and this change would be in form of an increase in general. Research highlights: This species (Abies) seems incapable of keeping up with such changes without human intervention. Thus, considering the study results, it is recommended to make necessary amendments to the forest management plans.
Global population growth and increasing urban population density together are responsible for many disruptions such as environmental pollution, especially air one. Trace metals are of specific prominence as air pollutants because they are conservative pollutants. They tend to accumulate biologically; some have poisonous or carcinogenic effects, even at small concentrations. Among toxic trace metals, lead (Pb) and zinc (Zn) can be harmful to human health in certain quantities. These trace metals were included in primary pollutant lists of the Agency for Toxic Substances and Disease Registry. Therefore, determining these trace metal concentrations in the air and monitoring the differences is very important for determining the risky districts and the level of risk. Biomonitors are the most important indicators of differences in trace metal concentrations in the atmosphere. The plants chosen as biomonitors intake several of the trace metals from the soil and/or the air into their bodies and determining the level of this accumulation might provide insight into the trace metal pollution of the atmosphere and soil. The present study aims to determine the variations of Pb and Zn concentrations in various landscaping plants growing in different districts of Kastamonu (Türkiye) depending on tree species, organs and traffic density. It was found that unwashed leaves of Acer negundo L. can be suggested as a good biomonitor for the presence of both analysed trace metals. Keywords: biomonitor; air pollution; trace metal; lead; zinc; traffic
Chromium (Cr) is one of the most detrimental heavy metals, the concentration of which has increased significantly in nature in the last century. Cr pollution can cause toxic and harmful health effects by causing high accumulation levels in animal and human tissues, seriously affecting ecosystems and natural resources. Due to environmental and human health risks, it is critical to track the change of Cr pollution in the air and reduce it. This study aims to determine the suitable tree species that can be used for observing and reducing Cr pollution. For this purpose, samples (wood, inner bark and outer bark) taken from Pinus pinaster, Cupressus arizonica, Picea orientalis, Cedrus atlantica, and Pseudotsuga menziesii species grown in Düzce, Türkiye, which is among the 5 most polluted cities in Europe according to the World Air Pollution 2021 Report, were examined. The accumulation of Cr concentration was determined by species (40-year-old), organ, and direction, and changes in age range were evaluated. As a result of the study, while the highest concentration levels were determined in the outer bark in general, it was interpreted that the branching structure affected this situation. The study results reveal that, in general, Cr pollution is mainly caused by traffic. It has been determined that C. arizonica and P. menziesii are the suitable tree species that can be used for observing and reducing Cr pollution in the air.
It is inevitable that the global climate change, which has important effects on the climate throughout the world, would have significant effects on the biocomfort zones. Hence, how global climate change will change the biocomfort zones should be determined and the data to be obtained should be used in urban planning projects. In the current study, SSPs 245 and SSPs 585 scenarios were taken as a basis, and the potential effects of global climate change on the biocomfort zones in Muğla province, Türkiye were investigated. Within the scope of the present study, the current status of biocomfort zones in Muğla and their possible conditions in years 2040, 2060, 2080, and 2100 were compared using DI and ETv methods. At the end of the study, it was estimated that, according DI method, 14.13% of Muğla province are in cold zone, 31.96% in cool zone, and 53.71% in comfortable zone. According to the SSPs 585 scenario, together with the increase in temperature, the cold and cool zones will totally disappear in year 2100, comfortable zones will decrease to 31.22%, and approx. 68.78% of the province will be in hot zone. According to the calculations made using ETv method, Muğla province currently consists of moderately cold zones by 2%, quite cold zones by 13.16%, slightly cold zones by 57.06%, and mild zones by 27.79%. Based on the SSPs 585 scenario for the year 2100, it is projected that Muğla will consist of slightly cool zones by 1.41%, mild zones by 14.42%, and comfortable zones by 68.06%, besides warm zones by 16.11% which are not present at this moment. This finding suggests that especially the cooling costs will increase and the air-conditioning systems to be used will negatively affect the global climate change through the energy consumption and the gases used.
Electromagnetic radiation is a substantial pollution factor that most of the living things found almost everywhere are constantly exposed to with current technology. The number of studies conducted on the effects of this exposed radiation on the living things constantly is limited; and almost all of the studies conducted are aimed at measuring the effects of short-term exposure. In addition to this, most of the studies conducted on plants focus on herbaceous plant species. In this study, the effects of distance to base station on flower and cone yield and germination percentage were investigated in Pinus brutia individuals, one of the critical forest tree species. The study results revealed that being close to the base station significantly reduced the number of flowers and cones in P. brutia individuals, and that the values obtained in individuals at a distance of 800 m from the base station were 11 times more than the number of flowers and 7 times more than the number of cones compared to the individuals at a distance of 100 m. In the seeds subject to the study, there is a three-times difference in terms of the germination percentage among the individuals located at the furthest and closest distance to the base station. These results show that P. brutia individuals are considerably affected by the base station.
The stomatal characteristics, length and dry weight as well as stable carbon isotope composition (⤑C) of needles and tree rings of Qinghai spruce (Picea crassifolia) at different altitudes in the Qilian mountains were investigated. The results showed that stomatal density, distribution pattern on epidermis, and length and dry weight of needles all increased with altitude below 3,000 m. In contrast, these parameters all decreased with increasing altitude above 3,000 m. Furthermore an assay of tree rings showed that near 3,000 m in altitude was the optimum zone for growth and development of Qinghai spruce. Although atmospheric CO2 concentration influences stomatal density, the effects of many environmental factors, such as temperature, light and rainfall, could obscure the effects of changes in atmospheric CO2 concentration on stomatal density at altitudes higher than the optimum for growth. The correlation of stomatal density with atmospheric CO2 concentration and ⤑C of Qinghai spruce needles was significant below 3,000 m, but was insignificant above 3,000 m altitude. The ⤑C value of needles, however, was negatively correlated with atmospheric CO2 concentrations. Therefore, the influence of altitude should be considered in research on plant physiological ecology and the relationship of stomatal density with ⤑C value or atmospheric CO2 concentration.
Acer negondo L. ve Acer pseudoplatanus L. fidanlarında kuraklık ve UV-B streslerinin bazı anatomik, morfolojik ve fizyolojik karakterler üzerine etkisi. Doktora tezi
- H Çobanoğlu
Çobanoğlu, H. (2023). Acer negondo L. ve Acer pseudoplatanus L. fidanlarında kuraklık ve UV-B streslerinin bazı anatomik,
morfolojik ve fizyolojik karakterler üzerine etkisi. Doktora tezi, Düzce Üniversitesi, Türkiye.
Kısıntılı sulama koşullarında yetiştirilen gemlik zeytin fidanlarının agronomik ve fizyolojik ozellikleri ile yuksek sıcaklık toleranslarının belirlenmesi. Yüksek lisans tezi
- B Oncu
Oncu, B. (2021). Kısıntılı sulama koşullarında yetiştirilen gemlik zeytin fidanlarının agronomik ve fizyolojik ozellikleri ile
yuksek sıcaklık toleranslarının belirlenmesi. Yüksek lisans tezi, Bursa Uludağ Universitesi, Bursa, Turkiye.
Drought-induced responses of photosynthesis and antioxidant metabolism in higher plants
- A R Reddy
- K V Chaitanya
- M Vivekanandan
Reddy, A. R., Chaitanya, K. V., & Vivekanandan, M. (2004). Drought-induced responses of photosynthesis and antioxidant
metabolism in higher plants. Journal of Plant Physiology, 161(11): 1189-1202.
Phytoremediation and long-term metal uptake monitoring of silver, selenium, antimony, and thallium by black pine (Pinus nigra Arnold)
- H Sevik
- Y Yildiz
- H B Ozel
Sevik, H., Yildiz, Y., Ozel, H.B. (2024). Phytoremediation and long-term metal uptake monitoring of silver, selenium, antimony,
and thallium by black pine (Pinus nigra Arnold). BioResources, 19(3): 4824-4837.
Clonal variation based on some morphological and micromorphological characteristics in the Boyabat
- N Yigit
- A Öztürk
- H Sevik
- H B Özel
- F E R Kshkush
- B Işık
Yigit, N., Öztürk, A., Sevik, H., Özel, H. B., Kshkush, F. E. R., and Işık, B. (2023). Clonal variation based on some morphological
and micromorphological characteristics in the Boyabat (Sinop/Turkey) black pine (Pinus nigra subsp. pallasiana (Lamb.)