Record ID No. |
976 |
Author(s) |
Montilla,E., Rivera,R .A., Herrera,R.A., Fernandez,F , 2005 |
Affiliation |
Departamento de Produccion Vegetal, Instituto de Investigaciones Agropecuarias (IIAP), Facultad de Ciencias Forestales y Ambientales, Universidad de Los Andes, Merida, Venezuela. |
Title |
Spatial-seasonal characterization of native mycorrhiza of two coffee plantations in Cuba |
Source. Vol.(no):Page |
Cultivos-Tropicales. 26(4): 5-12p. |
Categories |
Mycorrhiza General |
Subjects |
Soil plant relations |
Sub-subjects |
Plantations |
Host |
Coffea arabica |
Organism |
Glomales, Diversisporales, Acaulosporaceae, Glomaceae, Gigasporaceae |
Country |
Venezuela, S. America |
Abstracts |
In order to evaluate the native mycorrhiza functioning in coffee plantations and to establish the future strategy of arbuscular mycorrhizal management under field conditions, an experiment was conducted in 2 coffee plantations with different soil types (rhodic Eutrudox-Ferralsol and chromic Cambisol). Six plants per site were randomly selected, and 6 soil samples were taken at 30, 60 and 90 cm distance from each plant and at 0-20 and 20-40 cm depth. Samples were obtained during 2 physiological plant stages - fruiting and post-harvest. The mycorrhizal components of each sample were determined, and chemicals analyses and identification of genera and species of the native mycorrhizal fungi were carried out. Data were subjected to statistical analyses (ANOVA, Turkey media test and principal component analysis) to determine the spatial dispersion of variables and treatments. Results showed a strong effect of the physiological stages on the mycorrhizal functioning and spore populations. Fruiting was characterized by a high metabolic activity, high values of colonized root percentage, visual density of root colonization, large amount of extra-matrical mycelium and low spore number in contrast with post-harvest stage, where spore populations increased at the expense of significant decrease in other fungal variables. This could probably be due to the low plant metabolic activity that could stimulate sporulation as a survival mechanism. The presence of spores from the order Glomales and Diversisporales, and from the families Acaulosporaceae, Glomaceae and Gigasporaceae, were observed. The most representative genera were Acaulospora and Glomus, with an average appearance of 52.06 and 38.80%, respectively. |