Rajaram Panneerselvam

• M.Sc., M.Phil., Ph.D., B.Ed.,
• Annamalai University

In nature, plants are always subjected to various abiotic stresses such as drought, salinity, high temperatures and so on. Among these drought is a worldwide problem, responsible for limiting the growth, physiology and productivity of plants, thus has become a challenge for global food security towards growing population. Proso millet (Panicum mili...

The present investigation was undertaken for the assessment of 14 accessions of Excoecaria agallocha L. collected from Indian mangrove by RAPD markers. DNA was isolated using the CTAB method. Fifteen out of twenty primers screened were informative and produced 118 amplification products, among which 62 products (52.54%) were found to be polymorphic...

A pot-culture experiment was conducted to estimate the ameliorating effect of triazole compounds Hexaconazole, Tebuconazole and Propiconazole on drought stress in sunflower (Helianthus annuus L.). The plants were subjected to drought (DID) stress after four days of interval from the 30th day of sowing (DAS). One-day-interval irrigation was kept as...

Objective To screen the antioxidant potential of leaf and stem of the various ecotypes of Brahmi. Methods The medicinally important plant, Bacopa monnieri L (B. monnieri). to analyze the antioxidative enzymes, superoxide dismutase (EC 1.15.1.1) catalase (EC 1.11.1.6) and peroxidases (E.C. 1.11.1.7), and some non-enzymatic antioxidants. Results Th...

Drought stress is one of the abiotic stresses and it may alter plant growth, metabolism and yield. The present study aims to analyze the growth, chlorophyll pigments, osmotic adjustment and antioxidative enzymes activity in Panicum sumatrense under drought stress. The control was irrigated daily and treated plants were irrigated at 4-, 7-, 10-, 13-...

Objective To investigate morphological and biochemical mechanism between plant and drought stress by the way of plant survival under drought stress. Methods Drought stress was imposed by irrigation daily (Control), 4, 7, 10 and 13 days interval (4 DID, 7 DID, 10 DID and 13 DID). Later they were irrigated at regular intervals for different maturity...

Preliminary analysis of flavonoid chromatographic migration profiles of endemic/endangered species of Rauvolfia L from Southern Western Ghats of India were carried out. Paper chromatogram showed maximum separation in the solvent system of forestral. In the paper chromatogram, number of flavonoid spots varied from 9 to 12 in the five taxa studied. T...

Abelmoschus esculentus L. was selected for present study under pot culture in Completely Randomized Block Design (CRBD) experiment, hexaconazole and tebuconazole are a triazole derivative, which have both fungicidal and plant growth regulator (PGR) properties and also protect plants from several types of abiotic stresses. The plants were subjected...

Plant exhibits various patterns of survival under salinity and their growth and development depend on their capacity to overcome the stress. Present investigation was focused on the response and regulation of the antioxidant defense system and the level of lipid peroxidation in Panicum miliacium and Panicum sumatrense under salt treatments. NaCl st...

The genetic diversity of Xylocarpus a tree mangrove species was assessed. Three species viz., X. granatum, X. moluccensis and X. mekongensis were collected from different localities of the states of Tamil Nadu and Andhra Pradesh in India. These three species showed high degrees of phenotypic variation in the vegetative parts such as leaf, bark and...

Plectranthus forskohlii (Wild). Briq. (Syn: Coleus forskohlii) is an important indigenous medicinal plant in India. It has been used in traditional Ayurvedic medicine for curing various disorders and this is the only source of the diterpenoid forskolin. Forskolin is used for the treatment of eczema, asthma, psoriasis, cardiovascular disorders and h...

Brahmi is a small prostrate herb that grows wild in marshy and damp places near water logs throughout India. The plant has been used since ancient time in folklore and traditional medicine as nervine, cardio-tonic, and diuretic. The plants were collected from18 different geographical regions of south India. RAPD profiles in order to assess diversit...

Rauvolfia has long been regarded as medicinal plant. Leaves of all the reported five species of Rauvolfia from southern Western Ghats were chosen to investigate their antioxidant activities, phytochemicals and nutrient composition. The five species were then screened for their antioxidant potentials using various in vitro models such as total antio...

Afforestation becomes essential to conserve and increase the forest area. Mangroves have many endangered species which requires conservation. During afforestation, the species encounters different edaphic and environmental factors. For adopting the new environment, the introduced species tend to change its morphological and physiological characters...

To study the antimicrobial activity of Enicostemma littorale (E. littorale) using different solvents. Chloroform, methanol and acetone extracts of different parts of E. littorale (leaf, stem and root) were evaluated for antimicrobial activity using disc diffusion method against some gram-negative species such as Escherichia coli, Klebsiella pnemoni...

Excoecaria agallocha L. is a critically endangered mangrove tree from the Pichavaram mangrove reserve forest, the Tamil Nadu Coastal area. It is distributed on the seashore and the edge-mangrove. In order to reduce the decrease in number of these Mediterranean mixed stand, unsupervised forest management practices have drastically been reduced. In a...

Phytochemical and antioxidant activity studies of the leaves of Rauovlofia beddomei Hook. (Apocyanaceae) have been carried out. The ethyl acetate fraction of methanol extract yielded five compounds (1 – 5) identified as flavonoids: (1) kaempferol, (2) kaempferol-3-O-D-glucoside, (3) quercetin, (4) apigenin-3-O-D-glucoside, and (5) apigenin-7-O-neoh...

The effect of triadimefon (TDM) a triazole compound on antioxidant potential and eugenol content was studied in Ocimum tenuiflorum L. The plant was subjected to 15 mg/l TDM by soil-drenching on 50th, 70th and 90th days after planting (DAP). Analyses were carried out on 60th, 80th and 100th DAP. Both enzymatic and non-enzymatic antioxidant potential...

Excoecaria agallocha has long been used in folk medicine in many countries as antimicrobials and/or antioxidants. Eighty percent methanol extracts obtained from Excoecaria agallocha was evaluated for antibacterial activity using the disc diffusion assay, antiradical scavenging effects, reduced glutathione and phenolic. Best antibacterial activity a...

Objective To compare the antibacterial property between tissue cultured and wild plants of Clitoria ternatea.Methods Callus formation, shoot multiplication and rooting were carried out in MS medium supplemented with 2,4-D and KN; BA, KN and IAA; NAA and NAA, respectively. The antibacterial activity was evaluated using disc diffusion method against...

In order to assess the role of the antioxidative defense system against salt treatment, the activities of some antioxidative enzymes were monitored in a true mangrove, Excoecaria agallocha subjected to varying levels of NaCl. Salt stress was imposed on 60-days old plants with five different concentrations of NaCl (0, 100, 200, 300, 400 and 500 mM)...

The production of leaf and root antioxidant changes when exposed to saline conditions were investigated in the perennial halophyte Sesuvium portulacastrum L. Plants were grown with a nonsterilized soil and sterilized soil with 50 and 100% of sterilized seawater on 25, 55 and 85 Days After Planting (DAP). The plants were harvested on 30th, 60th and...

Medicinal plants are the source for wide variety of natural antioxidants. In the study reported here, we have conducted a comparative study between the different parts of the plant Enicostemma littorale. The amount of total phenols and antioxidant enzymes Glutathione-S-Transferase, Superoxide Dismutase, Catalase and Peroxidase activities were evalu...

To quantify the colchicine (alkaloid) present in Gloriosa superba by High Performance Liquid Chromatography (HPLC) method. Gloriosa superba species are known for their content of colchicine, a valuable alkaloid in the seeds and tubers (corms). HPLC analysis was carried out to confirm the presence of colchicine in Gloriosa superba. Treatment of gibb...

The triadimefon induced changes in antioxidant potential and alkaloid production of Datura fastuosa and Datura innoxia were studied. Both varieties were subjected to 15 mg L -1 triadimefon treatment by soil drenching on 55, 65 and 80 Days after Planting (DAP). The plants were harvested on 60, 75 and 90 DAP and used for analyzing antioxidant content...

In this study, 5 μM ABA and GA3 concentration were used to study the effect of these growth regulators on the andrographolide content and antioxidant potentials of Andrographis paniculata. The growth regulators were applied by means of foliar spray during morning hours. A significant enhancement in non-enzymatic antioxidant contents was observed in...

Changes in the sucrose metabolism of Curcuma longa L. plants were studied under treatment with different triazole compounds viz., triadimefon (TDM) and propiconazole (PCZ). Plants were treated with TDM at 15 mg/L and PCZ at 10 mg/L separately by soil drenching on 80, 110, and 140 days after planting (DAP). The plants were harvested randomly on 90,...

Triadimefon and hexaconazole are triazole group of fungicides have plant growth regulating properties. The present investigation aimed to study the growth regulating effect of these compounds on sweet potato (Ipomoea batatas L.). Each plant was treated with one litre of aqueous solutions containing 15mg L-1 triadimefon and 10mg L-1 hexaconazole on...

A field experiment was conducted to investigate the effect of growth regulators on growth characteristics such as root length, shoot length, total leaf area, number of inflorescence per plant, number of flower per inflorescence, whole plant fresh weight and whole plant dry weight. Photosynthetic characteristics were also analyzed based on the same...

Water is vital for plant growth, development and productivity. Permanent or temporary water deficit stress limits the growth and distribution of natural and artificial vegetation and the performance of cultivated plants (crops) more than any other environmental factor. Productive and sustainable agriculture necessitates growing plants (crops) in ar...

Environmental stresses (salinity, drought, heat/cold, light and other hostile conditions) may trigger in plants oxidative stress, generating the formation of reactive oxygen species (ROS). These species are partially reduced or activated derivatives of oxygen, comprising both free radical ( \textO2- ,\textOH , \textOH 2 ) ( {\text{O}}_{2}^{\cdot...

The effect of different plant growth regulators (PGR) and elicitor treatments on the alkaloid profile variation of Catharanthus roseus was investigated in the present study. The PGR used were paclobutrazol (PBZ), gibberellic acid (GA3) and Pseudomonas fluorescens elicitors (PF Elicitors). The estimated alkaloids were ajmalicine, catharanthine, tabe...

In the present investigation, different plant growth promoters and retardant were used to determine the anatomical characteristics of Catharanthus roseus. The plant growth promoters used were gibberellic acid (GA ) and Pseudomonas fluorescens elicitors (PF Elicitors) and retardant was paclobutrazol (PBZ). The 3 treatments were given by soil drenchi...

In the present investigation, experiments were conducted to study the effects of different sodium salts viz., sodium chloride (NaCl), sodium sulphate (Na2SO4) and sodium carbonate (Na2CO3) on morphological parameters (germination percentage, root and shoot length, dry weight of root and shoot) and photosynthetic pigment contents (chlorophyll 'a', c...

In the present study, the effect of Triadimefon and Hexaconazole on the enzymatic antioxidans like Superoxide dismutase and ascorbate perxidase of Manihot esculenta Crantz during the growth and maturation period was analysed. One litre of 20 mg L triadimefon and 15mg L hexaconazole solution per plant was used -1 -1 for the treatment and control was...

A pot culture experiment was conducted to estimate the effect of cobalt (0, 50, 100, 150, 200 and 250 mg kg-1soil) on morphological parameters, drymatter production, yield and yield components of soybean. Pot culture experiments were conducted during January 2006 to April 2006. Periodical observations were made to record the various morphological p...

Pennisetum plants were grown with NaCl and CaCl in order to study the effect of CaCl on NaCl 2 2 induced oxidative stress in terms of osmolyte concentration, proline (PRO)-metabolizing enzymes. The plants were treated with solutions of 100 mM NaCl, 100 mM NaCl with 5 mM CaCl and 5 mM CaCl alone. Groundwater 2 2 was used for irrigation of control pl...

For the past several years, several techniques of physiology have been applied to overcome the water deficit and drought stress in field crops. However little information is gained on the response to PBZ and ABA treatments under drought stress and their ameliorative actions on Sesamum. So a study was carried out to understand the effect of PBZ and...

In the present investigation, an attempt was made to study the effect of different triazole compounds viz., triadimefon, paclobutrazol and propiconazole on photosynthetic characteristics of Amorphophallus campanulatus. The results indicated that in Amorphophallus campanulatus the triazole compounds increased the total chlorophyll and carotenoid con...

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 pho...

In this study, Ocimum sanctum plants were treated with paclobutrazol (PBZ) and Abscissic acid (ABA) to analyze the changes in the enzymatic and non-enzymatic antioxidant responses. Non- enzymatic antioxidants like ascorbic acid decreased in the ABA treated plants. But it increased in the PBZ treated plants. Although both PBZ and ABA treatments cons...

The effects of triadimefon (TDM), a triazole compound, on NaCl-stressed blackgram (Vigna mungo (L.) Hepper) plants were studied to understand the ameliorative effect of this triazole derivative. Seeds were sown in plastic pots and irrigated with groundwater up to 35 days after sowing (DAS) to field capacity. Later plants were irrigated with groundw...

In the present study to estimate the effect of triazole viz. triadimefon and hexaconazole on the antioxidant metabolism of Raphanus sativus. Triadimefon (TDM) 10 mg and hexaconazole (HEX) 5 mg LG who l-1 1 treated to per plant in one pot, on 8, 23, 38 and 53 days after sowing (DAS). The antioxidant enzymes like superoxide dismutase (SOD), ascorbate...

The effect of different plat growth regulators like paclobutrazol (PBZ) gibberellic acid and Pseudomonas fluorescens treatments on the non-enzymatic antioxidant components of Catharanthus roseus was investigated in the present study. The treatments were given to plants by soil drenching on 38, 53, 68 and 83 days after planting (DAP). The plants wer...

Water is vital for plant growth, development and productivity. Water deficit stress limits the growth and distribution of natural vegetation and the performance of cultivated plants more than any other environmental factors. Although basic studies and practices aimed at improving water stress resistance and water use efficiency have been carried ou...

In the present investigation, changes in individual alkaloid profiles were studied in Catharanthus roseus (L.) G. Don. plants under treatment with Pseudomonas fluorescens. The Pseudomonas fluorescens treatments were given by soil drenching on 38, 53, 68 and 83 days after planting (DAP) by soil drenching. The plants were taken randomly on 45, 60, 75...

The effect of triadimefon was investigated in a medicinal plant, Catharanthus roseus subjected to water deficit stress. The abscisic acid (ABA) level, DNA and RNA contents and activities of ATPase and protease were found varying in different parts of the plants under treatment. Drought treatment increased the ABA level more than twofold in all part...

Jaleel C.A., Gopi R., Panneerselvam R. (2008): Biochemical alterations in white yam (Dioscorea rotundata Poir. ) under triazole fungicides: impacts on tuber quality. Czech J. Food Sci., 26: 298-307. An investigation was conducted to find out the effects of two triazole fungicides (triadimefon (TDM) and hexaconazole (HEX) - 15 and 10 mg/l per plant,...

Triadimefon is a triazole derivative, which have plant growth regulator properties. However, the influential mechanism of triadimefon on medicinal plants like Withania somnifera is not much studied. In the present investigation, the effects triadimefon at 10 mg L−1 on the germination, early seedling growth, photosynthetic pigments, non-enzymatic an...

A pot-culture experiment was conducted to estimate the ameliorating effect of triadimefon (TDM) on drought stress in sunflower (Helianthus annuus L.) plants. The plants were subjected to 3-, 6-, and 9-day-interval drought (DID) stress and drought stress with TDM @ 15 mg l(-1) and 15 mg l(-1) TDM alone from the 30th day after sowing (DAS). One-day-i...

The ability of triadimefon (TDM), a triazole group of fungicide, to ameliorate salinity stress was studied in Catharanthus roseus (L.) G. Don. plants subjected to sodium chloride (NaCl) treatment. NaCl treatment at 80mM level decreased overall growth of this plant and reduced the chlorophyll contents, protein, antioxidant enzymes such as peroxidase...

An investigation was carried out to reveal the changes in the concentration of soluble carbohydrates under tuber dormancy in food yam (Dioscorea esculenta) tubers and in an economically important spice cum medicinal plant turmeric (Curcuma longa) rhizomes under storage. Harvested, fully matured tubers of yam and rhizomes of turmeric were stored in...

Triadimefon, potential fungicide cum plant-growth retardant was used in this study to investigate its effect on the growth and the photosynthetic pigment contents of two varieties of Catharanthus roseus (L.) G. Don. The plants of both varieties were subjected to 15 mg l(-1) triadimefon treatment by soil drenching 30, 45, 60, and 75 days after plant...

The variations in antioxidant potentials and indole alkaloid content were studied in the present investigation, in two varieties (rosea and alba) of Catharanthus roseus, an important herb used in traditional as well as modern medicine, exposed to water deficit stress. The antioxidant and alkaloid profiles were estimated from root, stem, leaf, flowe...

The effect of different triazole compounds, viz., triadimefon (TDM) and hexaconazole (HEX) treatments on the antioxidant metabolism of Solenostemon rotundifolius Poir., Morton plants was investigated in the present study under pot culture. Plants were treated with TDM at 15 mg l(-1) and HEX at 10 mg l(-1) separately by soil drenching on 80, 110 and...

In the present work, we have analysed the changes in the reactive oxygen metabolism of Catharanthus roseus (L.) G. Don. plants in terms of H(2)O(2) content, lipid peroxidation and the free radical quenching systems (non-enzymatic and enzymatic antioxidants) under drought stress. In addition to this, the root alkaloid ajmalicine was extracted and qu...

In the present investigation, five varieties of okra (Abelmoschus esculentus (L.) Moench.) were screened for their water use efficiency under two water regimes, viz., 60% and 100% filed capacity. Drought stress was imposed at 60% field capacity from 30 to 70 days after sowing, while the control pots were maintained at 100% field capacity throughout...

Experiments were conducted to study the effects of different sodium salts viz., sodium chloride (NaCl), sodium sulphate (Na(2)SO(4)) and sodium carbonate (Na(2)CO(3)) on growth, dry matter production, mineral contents, biochemical constituent and enzyme activities of sunflower (Helianthus annuus L.). The germinating sunflower seeds were treated wit...

A pot culture experiment was conducted to estimate the stress ameliorating ability of paclobutrazol, a triazole fungicide in Vigna unguiculata (L.) Walp. plants. Treatments were given as 80 mM NaCl, 80 mM NaCl+15 mg l(-1) paclobutrazol and 15 mg l(-1) paclobutrazol alone. The samples were collected on 60 and 80 days after sowing (DAS). NaCl stress...

An experiment was conducted in two varieties, rosea and alba, of Catharanthus roseus plants with two watering treatments viz., 100 and 60% of field capacity, to understand the effects of water deficit on early growth, biomass allocation and photosynthetic pigment responses. We found that there were significant differences in early growth, dry matte...

An investigation was carried out to estimate the salt stress ameliorative effect of propiconazole (a triazole group of fungicide cum plant growth regulator) on the NaCl stressed Catharanthus roseus. The experiment was conducted in pots. All the pots were irrigated to the field capacity with ground water up to 30 days after sowing (DAS). The treatme...

Two varieties, rosea and alba, of Catharanthus roseus (L.) G. Don. were screened for their water use efficiency under two watering regimes, viz. 60 and 100% filed capacity in the present study. Drought stress was imposed at 60% filed capacity from 30 to 70 days after sowing, while the control pots were maintained at 100% filed capacity throughout t...

The mitigative effects of triadimefon (5 mg/L) on the germination, early seedling growth, photosynthetic pigments, non-enzymatic antioxidant contents and activities of antioxidant enzymes were studied in salt stressed (40 mM NaCl) Withania somnifera Dunal plants. Salinity stress decreased the germination percentage, early seedling growth and chloro...

The main objectives of this study wre to asses the effect of Triadimefon and Hexaconazole on the non-enzymatic antioxidant potentials of Manihot esculenta Crantz during the growth and maturation period. One litre of 20 mg L triadimefon and 15mg L hexaconazole solution per plant was used for the treatment -1 -1 and control was treated with one litre...

In this study we tried to explore the changes occurring in antioxidant enzymes Ascorbate peroxidase (APX, EC: 1.11.1.11), Catalase (CAT, EC: 1.11.1.6) and Superoxide dismutase (SOD, EC: 1.15.1.1) of two Coleus speceis (Plectranthus aromaticus Benth and Plectranthus vettiveroides K.C. Jacob.) on treatments with propiconazole and hexaconazole. The tr...

An investigation was carried out to study the effect of Triadimefon and Hexaconazole on th e photosynthetic pigment characteristics of tapioca (Manihot esculenta Crantz) during the growth and maturation period. One litre of 20 mg L-1 triadimefon and 15mg L-1 hexaconazole solution per plant was used for the treatment and control was treated with one...

The effect of different plant growth regulators (PGR) and fungicide treatments on the growth characteristics of Catharanthus roseus (L.) G. Don. (Madagascar periwinkle, Family: Apocynaceae) was investigated in the present study. The PGR used were paclobutrazol (PBZ), gibberellic acid (GA ) an d 3 Pseudomonas fluorescens elicitors (PF Elicitors) by...

A pot culture experiment was conducted to estimate the changes occurring in antioxidants like ascorbic acid, α-tocopherol and total phenols of Plectranthus aromaticus and Plectranthus vettiveroids on treatments with propiconazole and hexaconazole. The treatments were given as soil drenching 30, 50 and 70 days after planting (DAP). The plants were u...

In a pot culture experiment, the effect of calcium chloride (CaCl2) as an ameliorating agent on sodium chloride (NaCl) stress was studied in Dioscorea rotundata plants. Plants were raised in pots and exposed to salinity stress (80 mM NaCl) with or without 5 mM CaCl2. NaCl-stressed plants showed decreased protein and total sug- ars, and increased fr...

The effect of salinity on growth, photosynthetic pigment content, and alkaloid secondary metabolite accumulation were studied in an economically important medicinal plant, Catharanthus roseus (L.) G. Don., under pot culture conditions. Plants were treated with different concentrations of NaCl, (e.g. 50 and 100 mM) 30, 45, 60, and 75 days after sowi...

Triadimefon (TDM), a systemic fungicide with non-traditional plant-growth regulator properties, was administered to Catharanthus roseus (L.) G. Don. plants in order to determine its effects on oxidative injury in terms of H2O2 content, lipid peroxidation (LPO), electrolyte leakage (EL), protein and amino acid contents, as well as proline metabolism...

AIM: To evaluate the antioxidant potential and indole alkaloid variations in different parts of two varieties (rosea and alba) of Catharanthus roseus. METHODS: The antioxidant potentials were examined in terms of non-enzymatic antioxidant molecules and activities of antioxidant enzymes. The non-enzymatic antioxidant molecules studied were ascorbic...

The effect of paclobutrazol (PBZ) treatments on the antioxidant metabolism of white yam (Dioscorea rotundata Poir.) was investigated in the present study. PBZ @ 15 mg l(-1) plant(-1) was given to plants by soil drenching, 30, 60, and 90 days after planting (DAP). The non-enzymatic antioxidant contents like ascorbic acid (AA), reduced glutathione (G...

Some medicinal plants need to be cultivated commercially in order to meet the ever-increasing demand for medicinal plants for the indigenous systems of medicine as well as for the pharmaceutical industry; in this regard, it seems significant to test the important medicinal plants for their salt-tolerance capacity, with a view to exploiting the sali...

An investigation was conducted in Plectranthus forskholii by giving it different concentrations (10, 15, 20, 25, and 30 mg L(-1)) of hexaconazole, a fungicide cum plant-growth regulator, in order to find out its effects on growth, pigment composition, and antioxidant potential. The treatments were given as soil drenching on different growth stages....

An investigation was carried out to find out the extent of changes occurred in groundnut (Arachis hypogaea L.) cultivars in response to paclobutrazol (PBZ) treatment under water deficit stress. Two groundnut cultivars namely ICG 221 and ICG 476 were used for the study. Individual treatment with PBZ and drought stress showed an increase in ascorbic...

The effects of two triazole compounds, triadimefon and hexaconazole, on the growth and carbohydrate metabolism were studied in Solenostemon rotundifolius Poir., Morton plants under pot culture. Plants were treated with triadimefon at 15mg l(-1) and hexaconazole at 10mg l(-1) separately by soil drenching on 80, 110 and 140 days after planting (DAP)....

A pot culture experiment was conducted to estimate the drought stress mitigating effect of ketoconazole (KCZ), a fungicide cum plant growth regulator, in Catharanthus roseus plants. The plants under pot culture were subjected to drought stress and drought stress with KCZ from 30 days after sowing (DAS) and regular irrigation was kept as control. An...

The application of triazole fungicides is a common practice in the cultivation of carrot (Daucus carota L.) plants. It is there for seems important to test the changes that are occurring in this food crop under triazoles, the non-traditional plant growth regulators, treatments in order to identify the extent to which it tolerate the fungicide appli...

Changes in antioxidant potentials and indole alkaloid, ajmalicine, production were studied in Catharanthus roseus (L.) G. Don. plants under treatment with gibberellic acid (GA(3)). The GA(3) treatments were given in two ways, foliar spray and soil drenching methods on 30, 45, 60 and 75 days after planting (DAP). The plants were uprooted randomly on...

An investigation was carried out with paclobutrazol (PBZ) in order to study its effect on the photosynthetic and anatomical characteristics of Catharanthus roseus (L.) G. Don. The chlorophyll content and related parameters like net photosynthetic rate, transpiration rate and internal CO2 concentration were measured from control and treated plant sa...

The effect of plant growth promoting rhizobacteria (PGPR) like Pseudomonas fluorescens on growth parameters and the production of ajmalicine were investigated in Catharanthus roseus under drought stress. The plants under pot culture were subjected to 10, 15 and 20 days interval drought (DID) stress and drought stress with Pseudomonas fluorescens at...

The present investigation was conducted to determine whether CaCl(2) increases Catharanthus roseus drought tolerance and if such tolerance is correlated with changes in oxidative stress, osmoregulation and indole alkaloid accumulation. C. roseus plants were grown under water deficit environments with or without CaCl(2). Drought induced oxidative st...

In the present investigation, two watering treatments, viz., 100% and 60% field capacity (FC) were used to understand the effects of water deficit on early growth, biomass allocation, pigment and biochemical constituents and proline metabolism of five varieties of Sunflower (Helianthus annuus L.) plants. We found that there was a significant differ...

Catharanthus roseus (L.) G. Don plants were grown in different water regimes in order to study the drought induced osmotic stress and proline (PRO) metabolism, antioxidative enzyme activities and indole alkaloid accumulation. The plants under pot culture were subjected to 10, 15 and 20 days interval drought (DID) stress from 30 days after sowing (D...

We have evaluated the ability of two triazole growth regulators, viz. triadimefon (TDM) and hexaconazole (HEX), in the enhancement of tuber production and quality in cassava (Manihot esculenta Crantz) through their effects on carbohydrate metabolism. One litre of 20 mg(-1) TDM and 15 mg(-1) HEX solution per plant were used for the treatments and gr...

Catharanthus roseus (L.) G. Don. plants were grown with NaCl and CaCl2 in order to study the effect of CaCl2 on NaCl-induced oxidative stress in terms of lipid peroxidation (TBARS content), H2O2 content, osmolyte concentration, proline (PRO)-metabolizing enzymes, antioxidant enzyme activities, and indole alkaloid accumulation. The plants were treat...

We have examined the changes in carbohydrate metabolism in food yam (Dioscorea esculenta (Lour.) Burk.) tubers and in an economically important spice cum medicinal plant turmeric (Curcuma longa L.) rhizomes under storage. Both specimens showed varied levels of dormancy and sprouting appeared at the end of dormant period. Harvested, fully matured tu...

The present investigation was carried out with an aim to study the effects of two important fungicides/plant growth regulators, triadimefon (TDM) and hexaconazole (HEX) on white yam (Dioscorea rotundata Poir.). Each plant was treated with 1l of aqueous solution containing 15mgl-1 TDM and 10mgl−1 HEX by soil drenching on 10, 20 and 30days after plan...

In the present study, a pot culture experiment was conducted to estimate the ameliorating effect of propiconazole (PCZ) on drought stress in cowpea (Vigna unguiculata (L.) Walp.) plants. From 30 days after sowing (DAS), the plants were subjected to 3, 6 and 9 days interval drought (DID) stress and drought stress with PCZ at 15 and 15 mg l(-1) PCZ a...

The effect of paclobutrazol, a plant growth regulator, on antioxidant defense system was investigated in Catharanthus roseus (L.) G. Don. plants subjected to NaCl stress. The growth parameters were significantly reduced under 80mM NaCl treatment; however, this growth inhibition was less in paclobutrazol-treated (15mgl−1plant−1) plants. The non-enzy...