Raul Hernando Posada

University of Caldas · Departamento de ciencias exactas y naturales

Dark septate endophytes (DSE) and arbuscular mycorrhizal fungi (AMF) can simultaneously colonize the roots of different plants; their function and association can range from symbiotic to parasitic. The type of interaction is believed to be dependent on environmental and soil nutritional conditions. We quantified banana root colonization by arbuscul...

The banana is widely and intensively cultivated in the tropics. Traditional production employs a high input of industrial supplements, the excess of which contaminates the environment, altering existing edaphic populations and their functions. Some producers have incorporated other plant species in polycultures to reduce costs and achieve an altern...

Arbuscular mycorrhizal fungi (AMF) are essential for growth of coffee plants in acidic and phosphate deficient soils in Central and South America. We investigated the species richness of Glomeromycotean fungi in 9–13 years old coffee plantations in Colombia and Mexico. Fungal species richness was related to physical and chemical soil factors, soil...

Certain large cities are carrying out programs of afforestation in an attempt to solve problems related to pollution. This incorporation of trees and shrubs has opened the doors to the incorporation of scale insects with patterns of distribution and density that is dependent on many factors. This research evaluated the distribution patterns of scal...

Citrus spp. L. are economically important fruit trees in the tropics, subtropics and Mediterranean climates. Vitis vinifera has worldwide importance for table grape and wine production and has its distribution in climates between 40-50 degree latitude South and North of the Americas, Europe, Asia, Africa and Australia. Physalis peruviana (cape goos...

The distribution of arbuscular mycorrhizal (AM) fungal structures in roots, in soil surrounding roots and in amended coffee pulps (CP) was investigated in 12 coffee plantations in Colombia. Fresh CP had been added to plants 6 -10 months before sampling. The questions were whether soil chemical and physical parameter and soil depth had an effect on...

Almost 900 fungal isolates were obtained from eight coffee plantations in Colombia and Mexico. Of these, 76 isolates showed activity to solubilize Ca3(PO4)2 (PCa) and FePO4·H2O (PFe), which had been added to agar in a plate test. Generally, PCa was better solubilized than PFe. Colombian isolates were generally somewhat less effective than Mexican i...

Soil properties and the environment have multiple outcomes on fungal communities. Although, the interaction effects between management intensity, pH, available phosphorus, organic carbon, soil texture and different fractions of water stable macro-aggregates on the communities of microscopic filamentous fungi (MFF), iron phosphate solubilizing fungi...

El suelo y sus propiedades tienen múltiples relaciones con las comunidades fúngicas. El efecto conjunto de la intensidad de manejo y las variables edáficas, incluida la estabilidad de agregados sobre las comunidades de hongos microscópicos filamentosos (HMF), solubilizadores de fosfato de hierro (HSP-Fe) y solubilizadores tanto de fosfato de hierro...

Fungal colonization of litter has been described mostly in terms of fructification succession in the decomposition process or the process of fungal ligninolysis. No studies have been conducted on litter colonization by arbuscular mycorrhizal fungi (AMF) and their relationship with the presence of saprotrophic fungi. The aim of the present study was...

En Bogotá, desde hace cerca de 10 años se está llevando a cabo un programa de aforestación de la ciudad. Croton bogotensis, Eugenia myrtifolia, Ficus soatensis, Sambucus peruviana y Schinus molle, empleadas en este programa, están padeciendo frecuentes y severas afectaciones por plagas y enfermedades. Debido a que en ambientes citadinos son múltip...

Spore number and root infection by arbuscular mycorrhizal fungi were evaluated in Eugenia myrtifolia, Ficus soatensis and Croton bogotensis, in parks and green zones of urban woodlands of Bogotá DC. The aim was to investigate relations between mycorrhizal associations and tree phyto-sanitary conditions, and effects of two distinct climatic zones. I...

Spore number and root infection by Arbuscular mycorrhizal fungi were evaluated in Eugenia myrtifolia, Ficus soatensis and Croton bogotensis, in parks and green zones of urban woodlands of Bogotá D.C, Colombia. The aim was to investigate relations between mycorrhizal associations and tree phyto-sanitary conditions, and effects of two distinct climat...

Spore number and root infection by Arbuscular mycorrhizal fungi were evaluated in Eugenia myrtifolia, Ficus soatensis and Croton bogotensis, in parks and green zones of urban woodlands of Bogotá D.C, Colombia. The aim was to investigate relations between mycorrhizal associations and tree phyto-sanitary conditions, and effects of two distinct climat...

El complejo de insectos succionadores pertenecientes al género Pseudococcus (Hemiptera: Pseudococcidae) afecta entre otras especies vegetales al caucho sabanero, Ficus soatensis Dugand, especie ampliamente empleada en la arborización urbana de Bogotá sin ser reportada como afectada por el insecto plaga; su alta abundancia en la ciudad y su asociaci...

To evaluate the effects of soil physical and chemical factors (pH, conductivity, humidity, available phosphorus and organic matter) and environmental factors (temperature, relative air humidity, altitude and atmospheric pressure) on arbuscular mycorrhizal fungi (AMF)-Brachiaria decumbens grass relationship. Furthermore to establish patterns of micr...

The diversity of factors influencing the distribution of arbuscular mycorrhizal fungi inoculum (spores and hyphae), plant species, pH, soil humidity, conductivity, P availability, nutrients and heavy metals have been reported. Reports are contradictory and mostly supported on data from temperate zones; under tropical conditions it is difficult to d...

The subject of this research was to evaluate the effect of the time of establishment (05 years, 510 years, and more than 10 years.) of pastures of Brachiaria sp. over the Arbuscular Mycorrhizal Fungal populations (AMF): genus and spore distribution, length of extramatrical mycelia, root colonizations by AMF and septate fungi; the pastures resulting...

La patología arbórea ha progresado con especies de interés comercial, pero poco en otros sectores; la incorporación de árboles y arbustos a las ciudades con fines ornamentales y sanitarios en ambientes diferentes a las silvestres ha llevado a la manifestación de enfermedades de etiologías desconocidas, siendo Croton bogotensis, Ficus soatensis, Fra...