CHARACTERIZATION OF THE ANTAGONISM OF THE MYCORRHIZAL FUNGUS Waitea circinata AGAINST Magnaporthe oryzae, Cochliobolus miyabeanus, Monographella albescens AND Sarocladium oryzae RICE PATHOGENS
Palavras-chave:
brusone do arroz, controle biológico, fungo micorrízico, enzimas líticas, metabólitos voláteisResumo
A produção de arroz é afetada por patógenos importantes como Magnaporthe oryzae, Cochliobolus miyabeanus, Monographella albescens e Sarocladium oryzae, e fungos micorrízicos de orquídeas podem contribuir para o biocontrole dessas doenças. O objetivo deste estudo foi caracterizar os mecanismos de antagonismo de W. circinata contra patógenos do arroz. O ácido indolacético (AIA) e as enzimas líticas de W. circinata foram quantificadas. A eficácia do bioagente e seus metabólitos foi avaliada in vitro. O antagonismo in vivo contra a brusone do arroz também foi investigado. Waitea circinata produziu AIA (2,3 µg ml-1), celulase e polifenol oxidase em teste qualitativo. Glucanase, quitinase e protease também foram produzidas em cultura com paredes celulares e em co-cultura com patógenos para explicar a antibiose. W. circinata atua no antagonismo direto por antibiose e metabólitos voláteis. A suspensão micelial reduziu a germinação de conídios de M. oryzae, a formação de apressórios e a brusone do arroz em 61, 82 e 84%, respectivamente. W. circinata, um bioagente único, controla quatro patógenos do arroz. Os resultados podem contribuir para novas formulações contendo este fungo, enzimas, bem como seus metabólitos voláteis.
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