Luz Marina Melgarejo

Luz Marina Melgarejo
National University of Colombia | UNAL · Departamento de Biología (Bogotá)

PhD

About

186
Publications
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Introduction
Additional affiliations
January 2001 - July 2015
National University of Colombia
Position
  • profesora titular

Publications

Publications (186)
Book
Full-text available
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...
Article
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...
Article
Full-text available
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...
Article
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...
Article
Full-text available
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...
Chapter
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
Chapter
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
Article
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...
Article
Full-text available
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...
Article
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...
Article
Full-text available
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...
Article
Full-text available
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...
Preprint
Full-text available
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...
Article
Full-text available
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...
Article
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...
Chapter
Full-text available
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.
Article
Full-text available
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...
Article
Full-text available
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...
Article
Full-text available
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...
Article
Full-text available
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...
Article
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...
Book
Full-text available
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...
Chapter
Full-text available
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...
Article
Full-text available
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...
Article
Full-text available
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...
Article
Full-text available
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...
Data
Artículo divulgativo sobre la utilización de microalgas encapsulada en alginato para la valoración del estado tráfico de humedales en la sabana de Bogota´.
Article
Full-text available
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
Article
Full-text available
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%...
Article
Full-text available
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...
Data
Leaf photosynthesis-CO2 response curves of cacao for MPAR. (TXT)
Data
Leaf photosynthesis-CO2 response curves of cacao for HPAR. (TXT)
Data
Leaf photosynthesis-CO2 response curves of cacao for LPAR. (TXT)
Data
The photosynthetic response curves to PAR intensity for AFs. (TXT)
Data
Chl a fluorescence parameters as a function of PAR in cacao leaves for AFs. (TXT)
Article
Full-text available
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...
Article
Full-text available
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...
Article
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...
Article
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...
Article
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...
Article
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...
Article
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...
Article
Full-text available
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...
Article
Full-text available
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...
Article
Regression models to predict leaf area and leaf weight in cacao (Theobrama cacao L.) were fitted using leaves from cultivated plants under nursery conditions and from plants of commercial plantations, both located in the Amazon Investigations Center CIMAZ at Macagual, Caquetá, Colombia. A total of 2895 leaves were collected in such a way to cover a...
Article
Full-text available
Aim and background: We present a typology of cacao agroforest systems in Colombian Amazonia. These systems had yet to be described in the literature, especially their potential in terms of biodiversity conservation. The systems studied are located in a post-conflict area, and a deforestation front in Colombian Amazonia. Cacao cropping systems are...
Article
Biological significance: Theobroma grandiflorum and Theobroma bicolor are endemic Amazonian plants that are poorly traded at the local level. As close relatives of Theobroma cacao, they may provide a good alternative for human consumption and industrial purposes. In this regard, we performed equivalence studies by conducting a comparative biochemi...
Article
In Colombia, climate change causes an increased incidence of waterlogging and flooding in many agricultural areas, affecting crops, such as the cape gooseberry, which is very prone to Fusarium oxysporum. In a greenhouse, 2-month-old seed propagated cape gooseberry plants, grown in 2-L pots filled with horticultural soil+sand (70:30 vol%) that was p...
Article
Full-text available
Aquatic ecosystems are susceptible to deterioration caused by eutrophication. Changes in the nutrient concentration may affect species physiology, making it a key factor in structuring communities. Phytoplankters have a short generation time and a fast response to environmental factors, which makes them a good model to address issues related to the...
Article
To explore the species-specific relationships between anatomical and physiological traits related to salt tolerance and forest structure, we tested the hypothesis that mangrove trees living under different long-term salinity and nitrogen regimes have different leaf anatomical traits and intrinsic water use efficiency (WUE) patterns, leading to diff...
Presentation
Full-text available
LIBRO DE RESÚMENES XI CONGRESO DE FICOLOGÍA DE LATINOAMERICA Y EL CARIBE. IX REUNIÓN IBEROAMERICANA DE FICOLOGÍA Cali, Colombia 5 al 10 de noviembre de 2017
Article
Cassava is one of the main sources of energy for human populations in tropical countries. Cassava production can be severely reduced by diseases, such as the vascular bacteriosis (bacterial blight) caused by Xanthomonas axonopodis pv. manihotis (Xam). In this study, the physiological behavior of plants from two cassava varieties, one resistant and...
Article
Full-text available
La inmovilización de las algas tiene múltiples aplicaciones, tales como la biorremediación del agua y la producción de metabolitos. Una de las variables que se puede determinar en las algas inmovilizadas es la fluorescencia de la clorofila a, debido a que este parámetro está relacionado con la respuesta fisiológica de estos organismos. Por ello, el...
Article
Changes in abscisic acid (ABA), indole-3-acetic acid (IAA) and jasmonic acid (JA) content in developing calyx, fruits and leaves of Physalis peruviana L. plants were analysed. Plant hormones have been widely studied for their roles in the regulation of various aspects related to plant development and, in particular, into their action during develop...
Conference Paper
Full-text available
Los factores que influyen en la calidad de las frutas pasifloráceas comerciales en el País (maracuyá, gulupa, granadilla, curuba, badea y cholupa) dependen de las condiciones climáticas y del manejo del cultivo, además de las condiciones en poscosecha que son determinadas por el genotipo (variedad) de la planta. Las exigencias a los factores climát...
Conference Paper
Full-text available
La curuba es un frutal andino con alto potencial de exportación dadas sus propiedades organolépticas y bioquímicas; sin embargo, se desconocen aspectos de la fisiología del cultivo en función del ambiente físico, que está en constante cambio. Esta investigación tuvo el objetivo de evaluar aspectos de la fotosíntesis, el uso eficiente del agua y el...
Book
Full-text available
Los biofertilizantes y su uso en cultivos: El Maíz (Zea mays) como caso de estudio es un libro de carácter científico-divulgativo en relación con el tema del desarrollo de fertilizantes amigables con el ambiente. Se presentan resultados en el marcor del proyecto Potencial biofertilizante de bacterias fijadoras de nitrógeno y solubilizadoras de fosf...
Article
Full-text available
Purpose: To review the most important pre-operative and surgical risk factors for endothelial damage in patients undergoing cataract surgery and to provide a tool for risk stratification and guidelines to customize the surgical approach. Design: Review of the literature. Methods: We performed a review of the literature using the following MeSH term...