Luz Marina Melgarejo

Universidad Nacional de Colombia | UNAL

Microorganisms play a crucial role in the phosphorus cycle, as they mineralize and immobilize organic phosphorus and solubilize and precipitate the inorganic fraction of it. In various regions of the planet, the functional capacity of microorganisms in the solubilization process has been evaluated; however, in polar regions, the difficulty in acces...

The rapid growth of urban population has significantly changed human settlement patterns, leading to a decline in air quality and changes in climatic conditions in urban areas. Trees are recognized as nature-based solutions because they can remove particles from the air and regulate the climate. However, trees are negatively affected by pollution a...

The carnation (Dianthus caryophyllus L.) stands as a key export important for Colombia, yet its production faces challenges due to vascular wilting triggered by Fusarium oxysporum f. sp. dianthi (Fod). This study examined Fod impact on stomatal resistance, leaf temperature, and dry biomass in carnation plants, alongside its influence on rooted cutt...

Introduction: Passiflora tripartita var. mollissima (banana passionfruit) is one of the most promising exotic tropical fruits from the diversity of the Passifloraceae family in South America, because of its organoleptic properties and antioxidant activity. Objective: To evaluate the physiological and anatomical responses of banana passionfruit pla...

The rapid growth of urban population has significantly changed human settlement patterns, leading to a decline in air quality and changes in climatic conditions in urban areas. Trees are recognized as nature-based solutions because they can remove particles from the air and regulate the climate. However, trees are negatively affected by pollution a...

The goldenberry adapts well to altitudes between 1500 and 3000 m a.s.l., with optimum average temperatures in Colombia between 13°C and 16°C. 1500–2000 hours/year of direct sunshine promote the size, quality, and ripening of fruits. Light use efficiency is much higher in the reproductive stage. The roots and the basal vegetative stem are the larges...

Colombia is one of the main producers of carnations worldwide. However, its production has been affected by vascular wilting caused by the pathogen Fusarium oxysporum f. sp. dianthi (Fod). In previous studies, thiamine has been proposed as a potential resistance inducer for this disease, under greenhouse growth conditions. However, the specific con...

La evidencia muestra que todas las plantas conviven con endófitos, lo cual indica que desempeñan un papel fundamental aún por dilucidar. El objetivo de este trabajo fue evaluar el potencial biotecnológico de endófitos provenientes de Passiflora edulis f. edulis, en dos aspectos: como acción promotora de crecimiento vegetal y como controladores del...

Citation: Solarte, M.E.; Solarte Erazo, Y.; Ramírez Cupacán, E.; Enríquez Paz, C.; Melgarejo, L.M.; Lasso, E.; Flexas, J.; Gulias, J. Photosynthetic Abstract: Global warming and changes in land use are some of the main threats to high mountain species. Both can interact in ways not yet assessed. In this study, we evaluated the photosynthetic respon...

The impact of altitude on the different sugars and acids of the feijoa fruit is unknown. For that reason, the objective of this study was to evaluate the altitudinal effect on the content of organic acids (citric and malic) and sugars (glucose, fructose, and sucrose) during the development of feijoa fruits. The study was carried out in the towns of...

Semi-arid environments characterized by low rainfall are subject to soil desertification processes. These environments have heterogeneous landscapes with patches of vegetation known as resource islands that are generated by nurse species that delay the desertification process because they increase the availability of water and nutrients in the soil...

El libro está dividido en siete capítulos que incluyen principales aspectos ecológicos y sociales como: sus determinantes ecológicos, su dinámica vegetal natural, el régimen de disturbios natural y antrópico; los socioecosistemas y su gobernanza, y aspectos prácticos como la determinación de los escenarios de restauración; las estrategias necesaria...

Colletotrichum causing anthracnose in mango is known for its variable virulence that may have an effect on disease development and efficacy of management strategies. In this study, we characterized Colletotrichum spp. isolated from mango fruits under in vitro and in vivo conditions using close-range thermography and reflectance spectroscopy. Twenty...

Since the industrial revolution, anthropogenic activities have increased atmospheric CO2 concentration—one of the major causes of global warming—with a 600 to 700 ppm prediction by the end of this century. Orchards and vineyards are critical sustainable production systems that can minimize emissions and sequester carbon within the atmosphere. Infor...

Since the industrial revolution, anthropogenic activities have increased atmospheric CO2 concentration—one of the major causes of global warming—with a 600 to 700 ppm prediction by the end of this century. Orchards and vineyards are critical sustainable production systems that can minimize emissions and sequester carbon within the atmosphere. Infor...

South American Leaf Blight (SALB), caused by the fungus Pseudocercospora ulei, is the principal rubber crop disease in Latin America. Several studies have focused on the genetics of resistance and the epidemiology of this disease, but few have analyzed the physiological alterations caused by SALB in Hevea brasiliensis. In addition, changes under fi...

Growth rates of microalgae encapsulated in calcium alginate as a possible indicator of the trophic state of aquatic ecosystems There are many applications for encapsulated algae but the use as an indicator of the trophic state of aquatic environments has not been explored in-depth. In this paper, the effects of different nutrient concentrations in...

All chapters available in https://repositorio.unal.edu.co/handle/unal/11137 https://repositorio.unal.edu.co/bitstream/handle/unal/11137/06_Cap04.pdf?sequence=4&isAllowed=y

Full text available in https://repositorio.unal.edu.co/handle/unal/11137 https://repositorio.unal.edu.co/bitstream/handle/unal/11137/03_Cap01.pdf?sequence=2&isAllowed=y

One of the most important diseases affecting potato is late blight, caused by the oomycete Phtytophthora infestans. The use of jasmonic acid has been reported to reduce the progression of the disease in potato, but the defense mechanisms involved in this response are unknown. In this study we described the effect of jasmonic acid as a priming agent...

In this study, we measured diurnal patterns of sap flow (Vs) in cacao trees growing in three types of agroforestry systems (AFs) that differ in the incident solar radiation they receive. We modeled the relationship of Vs with several microclimatic characteristics of the AFs using mixed linear models. We characterized microclimatic variables that ma...

The effects of potassium (K) defciency on the physiological, biochemical, and anatomical parameters of leaves in the tree tomato plants (Solanum betaceum Cav.) were evaluated during vegetative growth. The experiment was carried out for 135 days after treatment applications under greenhouse conditions, employing the nutrient solutions with the follo...

Water deficits are the major constraint in some potato-growing areas of the world. The effect is most severe at the tuberization stage, resulting in lower yield. Therefore, an assessment of genetic and phenotypic variations resulting from water deficits in Colombia germplasm is required to accelerate breeding efforts. Phenotypic variations in respo...

Orphan crops, which include many of the tropical fruit species used in the juice industry, lack genomic resources and breeding efforts. Typical of this dilemma is the lack of commercial cultivars of purple passion fruit, Passiflora edulis f. edulis, and of information on the genetic resources of its substantial semiwild gene pool. In this study, we...

One of the most important diseases affecting potato is late blight, caused by the oomycete Phtytophthora infestans. The use of jasmonic acid has been reported to reduce the progression of the disease in potato, but the defense mechanisms involved in this response are unknown. In this study we described the effect of jasmonic acid as a priming agent...

Within the framework of the Mars City State Contest 2020 of The Mars Society, from Colombia, with an interdisciplinary and academic perspective, it was sought to give a perspective of solutions and answers to the challenges of possible human life on Mars. Thus, the document initially addresses a forward-looking prologue, an introduction to the conc...

Guava, due to its ability to grow in tropical and subtropical climates, has been introduced to some 60 low-latitude countries. It adapts to temperature ranges between 15 and 30°C. Outside this range, the effect of lower or higher temperatures reduces, in the first place, fruit set, while night temperatures of 5 to 7°C stop growth. Additionally, low...

The effect of different resistance inducers against carnation vascular wilting caused by Fusarium oxysporum f. sp. dianthi (Fod) was evaluated, as well as its relation with the content of phenols and flavonoids in roots of the carnation plants. Indexed cuttings of carnation (Dianthus caryophyllus L.) were used with three-weeks of rooting (variety S...

The purple passion fruit (Passiflora edulis Sims f. edulis) is a promising crop in Colombia because of its high potential for international markets and high profitability. However, without adequate fertilization, the metabolic processes of plant growth can be affected. The objective of this research was to evaluate the effect of macro- and micronut...

Water deficit stress is responsible for at least 40 % of crop losses worldwide, positioning itself as a strong threat to food security. Purple passion fruit (Passiflora edulis Sims f. edulis) is one of the most desirable exotic fruits on the world market mainly for its organoleptic properties. Information on the response to water deficit stress for...

Se describen las características morfológicas, las condiciones de clima y suelo para el cultivo comercial de la curuba, las variedades y cultivares, el establecimiento y manejo del cultivo, las principales enfermedades e insectos-plagas, la cosecha y poscosecha, así mismo la comercialización y el valor agregado.

Purple passion fruit, Passiflora edulis Sims f. edulis, is an important semi-perennial, fruit bearing vine originating in South America that produces a commercial tropical juice pulp for international and national consumption. Within the round purple passion fruit are a large number of membranous seed sacs each containing individual seeds. Little i...

Global demand for juice of the purple passion fruit, Passiflora edulis f. edulis , is growing, making it a promising species for farmers to grow in the highland tropics, to which it is adapted. However, research centers and private companies have done little to produce new high-yielding varieties. The objective of the present study, therefore, was...

In a literature review of the ecophysiology of the cape gooseberry (Physalis peruviana L.) it was found that in Colombia this typical Andean plant adapts to a wide altitudinal range of the tropical cold climate, between 1,800 and 2,800 m a.s.l., with optimal medium temperatures between 13 and 16°C and base (minimum) temperatures for stem and fruit...

The curuba (Passiflora tripartita var. mollissima) is an important Andean fruit in bioprospecting industries because of its pleasant taste and aroma, antioxidant potential and sedative action. The objective of this study was to evaluate the development of curuba plants and the physicochemical characteristics of fruits under two environmental tropic...

South American Leaf Blight (SALB) is a fungal disease caused by the pathogen Pseudocercospora ulei. It is the main disease affecting rubber trees in Latin America. This study was designed to investigate the changes in the spectral reflectance of rubber leaflets inoculated with P. ulei under controlled conditions. Young leaflets of two clones of Hev...

Anthracnose caused by Colletotrichum sp., is considered the most limiting disease in mango crops (Mangifera indica). Studies associated with this patosystem have focused on biological and molecular analyzes, but few have been approached from noninvasive methodologies. Within these techniques, infrared spectroscopy (NIR, Near infra Red) has been sho...

Este libro, editado por Luz Marina Melgarejo, se puede descargar gratis y completamente a través del link: "Gulupa (Passiflora edulis), curuba (Passiflora tripartita), aguacate (Persea americana) y tomate de árbol (Solanum betaceum) Innovaciones". Su contenido es: I. Aspectos en germinación, morfoagronomía, fenología, nutrición mineral, calidad de...

Este capítulo es parte del libro "Gulupa (Passiflora edulis), curuba (Passiflora tripartita), aguacate (Persea americana) y tomate de árbol (Solanum betaceum) Innovaciones" , editado por Luz Marina Melgarejo, que se puede descargar gratis y completamente a través del link: "Gulupa (Passiflora edulis), curuba (Passiflora tripartita), aguacate (Perse...

El libro va dirigido al sector agrícola, a cultivadores, al sector académico-investigativo, así como a personas interesadas en avances de la investigación en gulupa, curuba, aguacate cv. Hass y tomate de árbol, para su tecnificación y manejo. Los resultados se presentan en dos grandes temáticas: la primera, relacionada con aspectos de la germinació...

El libro va dirigido al sector agrícola, a cultivadores, al sector académico-investigativo, así como a personas interesadas en avances de la investigación en gulupa, curuba, aguacate cv. Hass y tomate de árbol, para su tecnificación y manejo. Los resultados se presentan en dos grandes temáticas: la primera, relacionada con aspectos de la germinació...

El libro va dirigido al sector agrícola, a cultivadores, al sector académico-investigativo, así como a personas interesadas en avances de la investigación en gulupa, curuba, aguacate cv. Hass y tomate de árbol, para su tecnificación y manejo. Los resultados se presentan en dos grandes temáticas: la primera, relacionada con aspectos de la germinació...

El libro va dirigido al sector agrícola, a cultivadores, al sector académico-investigativo, así como a personas interesadas en avances de la investigación en gulupa, curuba, aguacate cv. Hass y tomate de árbol, para su tecnificación y manejo. Los resultados se presentan en dos grandes temáticas: la primera, relacionada con aspectos de la germinació...

El libro va dirigido al sector agrícola, a cultivadores, al sector académico-investigativo, así como a personas interesadas en avances de la investigación en gulupa, curuba, aguacate cv. Hass y tomate de árbol, para su tecnificación y manejo. Los resultados se presentan en dos grandes temáticas: la primera, relacionada con aspectos de la germinació...

El libro va dirigido al sector agrícola, a cultivadores, al sector académico-investigativo, así como a personas interesadas en avances de la investigación en gulupa, curuba, aguacate cv. Hass y tomate de árbol, para su tecnificación y manejo. Los resultados se presentan en dos grandes temáticas: la primera, relacionada con aspectos de la germinació...

El libro va dirigido al sector agrícola, a cultivadores, al sector académico-investigativo, así como a personas interesadas en avances de la investigación en gulupa, curuba, aguacate cv. Hass y tomate de árbol, para su tecnificación y manejo. Los resultados se presentan en dos grandes temáticas: la primera, relacionada con aspectos de la germinació...

El libro va dirigido al sector agrícola, a cultivadores, al sector académico-investigativo, así como a personas interesadas en avances de la investigación en gulupa, curuba, aguacate cv. Hass y tomate de árbol, para su tecnificación y manejo. Los resultados se presentan en dos grandes temáticas: la primera, relacionada con aspectos de la germinació...

Purple passion fruit (Passiflora edulis Sims f. edulis) is a tropical juice source. The goal of this project was to evaluate photosynthetic and physiological variability for the crop with the hypotheses that landraces contain the diversity to adapt to higher elevation nontraditional growing environments and this is dependent on specific parameters...

Purple passion fruit (Passiflora edulis Sims f. edulis) is a tropical juice source. The goal of this project was to evaluate photosynthetic and physiological variability for the crop with the hypotheses that landraces contain the diversity to adapt to higher elevation nontraditional growing environments and this is dependent on specific parameters...

Colombia is the country with the greatest genetic diversity in passion fruit species, some of which are cultivated on an area of approximately 13,673 ha. Each variety must be planted at a suitable altitude under optimal conditions to obtain the best quality. Regarding plant nutrition, potassium has the greatest influence due to the effect of its ap...

Artículo divulgativo sobre la utilización de microalgas encapsulada en alginato para la valoración del estado tráfico de humedales en la sabana de Bogota´.

Artículo divulgativo sobre la utilización de algas microscópicas embebidas en esferas de alginato como sistema de valoración del estado tráfico de humedales de la Sabana de Bogotá. Publicado en la revista electrónica Bioika

Para conocer el efecto de los nutrientes minerales potasio (K), boro (B) y fósforo (P), sobre variables fisiológicas y de crecimiento en aguacate var. Hass, se evaluaron siete tratamientos y cuatro réplicas con tres niveles de dosis: (1) deficiencia del respectivo elemento: 50% de la fertilización completa, (2) completa o tratamiento control: 100%...

Cacao (Theobroma cacao L.) has traditionally been considered a crop that requires shade, and consequently it is implemented under agroforestry systems (AFs) in order to regulate the level of incident solar radiation. However, optimal shade levels for this tree crop may vary depending on the climate conditions of where it is grown. Here we analyzed...

Leaf photosynthesis-CO2 response curves of cacao for MPAR. (TXT)

Leaf photosynthesis-CO2 response curves of cacao for HPAR. (TXT)

Leaf photosynthesis-CO2 response curves of cacao for LPAR. (TXT)

The photosynthetic response curves to PAR intensity for AFs. (TXT)

Chl a fluorescence parameters as a function of PAR in cacao leaves for AFs. (TXT)

The rice hoja blanca virus (RHBV), transmitted by the planthopper insect Tagosodes orizicolus, is a disease that attacks rice and generates significant production losses in Colombia. Fedearroz 2000 and Colombia I commercial rice varieties, which have different resistance levels to the disease, were selected in this study. To identify proteins assoc...

The humic acid (HA) obtained with the activity of three bacterial strains that transformed a lignite-type low rank coal (LRC) and released humified organic matter (HOM) was characterized. The HA obtained with the activity of Bacillus mycoides, Microbacterium sp. and Acinetobacter baumannii were compared with HA obtained with the traditional alkalin...

We evaluated the contents of carotenoids, chlorophyll and pectin in guava fruit, Psidium guajava L., in three locations (Barbosa, Puente Nacional, and Velez) in Santander Department, Colombia in four varieties (Regional Blanca, Raquira Blanca, Guavata Victoria, Regional Roja) for four stages of maturity (green, physiological maturity, semi-ripe, ri...

In order to observe the effects of nutrients: potassium (K), boron (B) and phosphorus (P), on physiological and growth variables in avocado var. Hass, seven treatments and four repetitions with three dose levels were evaluated: (1) deficiency of the respective element: 50% or half of the complete fertilization, (2) complete or control treatment: 10...

South American leaf blight (SALB), the main disease found in the rubber tree crops of Latin America, is caused by the fungus Pseudocercospora ulei. This study aims to determine the photosynthetic response of two clones of H. brasiliensis with different resistances to SALB from P. ulei under controlled conditions, by means of a temporal analysis of...

Plant pathogens have developed different strategies during their evolutionary process to infect and colonize their hosts. In the same way, plants have evolved different mechanisms acting against potential pathogens trying to infect and colonize their tissues. Regulation of a wide variety of proteins is required in order to perceive the pathogen and...

Se evaluó el contenido de carotenoides, clorofila y pectinas en frutos de guayaba Psidium guajava L. en tres localidades del departamento de Santander, Colombia (Barbosa, Puente Nacional y Vélez), en cuatro variedades (Regional Blanca, Ráquira Blanca, Guavatá Victoria y Regional Roja) y en cuatro estados de madurez (verde, madurez fisiológica, pint...

La gulupa es un frutal nativo producido en Colombia y exportado a diferentes mercados internacionales. Los principales problemas que afectan la producción del cultivo están relacionados con la floración y fructificación, debido a limitaciones nutricionales, como la deficiencia de boro (B). La presente investigación tuvo como objetivo, evaluar el ef...

El presente trabajo tuvo como objetivo evaluar el efecto de dosis de nitrógeno, fósforo y potasio sobre el crecimiento del tomate de árbol en etapa vegetativa. Se realizó bajo condiciones de invernadero en la Universidad Nacional de Colombia (sede Bogotá) y se empleó un diseño de bloques aleatorizado, donde se evaluaron ocho tratamientos, con tres...