Samples were taken from the rhizosphere of rice (Oryza sativa) of the GAB 8 variety, in a plot under the organic subsistence farming modality. Rhizospheric fungi were isolated, determining significant differences in the total number of isolates for the crop cycle variables, rhizosphere sections (soil section, root section, soil+root mixture), phenological phases (vegetative, flowering, maturation) and dilutions (10-1 to 10-7). The biological activity (antagonism) of rhizospheric fungi against Pyricularia oryzae was evaluated. Twenty fungal strains were isolated that showed antagonistic activity against P. oryzae, 2 strains correspond to the species Aspergillus flavus, 3 to Aspergillus niger, 2 to Aspergillus spp, 2 to Penicillium sp (morphotype r1), 5 to Penicillium sp (morphotype r2) and 6 to Trichoderma sp (fungal morphotypes were molecularly identified by sequencing the ITS genes).
The present investigation developed the bioprospecting and characterization of rhizospheric fungi against pathogens of rice cultivars, as a possible alternative to the use of chemical synthesis fungicides.
