AVALIAÇÃO DA PATOGENICIDADE DE FUNGOS MICORRÍZICOS ISOLADOS DE Epidendrum cinnabarinum SALZ EX LINDL. EM DIFERENTES ESPÉCIES DE HORTALIÇAS

Abstract

The orchid family is made up of about 25,000 species in 900 genres. The genus Epidendrum spp. It has about 1500 species and occurs exclusively in the Neotropics, distributing of a wide variety of habitats. In this work we isolated an endophytic mycelium of the roots of an orchid Epidendrum species cinnabarinum SALZ EX Lindl, and by optical microscopy supported in the literature, it was identified as the genus Rhizoctonia sp. After identifying the isolated roots of seedlings which the Rhizoctonia (broccoli, cauliflower, cucumber and cabbage) were inoculated with the isolated and subjected to different times of exposure to the fungus (3 and 6 hours). After inoculation the seedlings were planted in individual pots where they remained for 20 days until the completion of biometric analysis. The variables used in biometry were leaf width; root length and hypocotyl; fresh matter of root and hypocotyl; Chlorophyll A, B and the total; dry matter of root and hypocotyl. The data obtained in biometrics were subjected to analysis of variance and means were compared by the Scott Knott test at 1 and 5% probability. Discarded if the pathogenicity of the fungus, since they were not observed Rhizoctonia symptoms nor the death of seedlings; We concluded that all bioindicators pathogenicity responded better to the treatment 3 hours of inoculation. A work in this perspective is of paramount importance due to the identification of fungi miorrízicos of orchids, which can help overcome the difficult acclimatization phase seedling conditions Ex vitro.