Avaliação de indutores de resistência e mecanismos bioquímicos no controle da antracnose do feijão caupi (Vigna unguiculata L. Walp.)

Abstract

The cowpea is a major source of income in the North/Northeast of Brazil. But the same can be affected by a wide range of plant pathogens can damage production and productivity. Currently it is common to use resistance inducers as a means to combat the pathogens attack. This work aimed to evaluate resistance inducers, as well as the biochemical mechanisms in controlling anthracnose of cowpea (Vigna unguiculata L. Walp.). We conducted an antagonistic test with various strains of Trichoderma URM front of Colletotrichum lidemuthianum URM3149, the greenhouse was applied four abiotic inducers (salicylic acid, chitosan, amino butyric acid, acibenzolar-S-methyl) and biotic (Trichoderma) in cowpea plants. The severity of the disease, as well as enzymatic activities performed leaves was evaluated (catalase, peroxidase, polyphenol oxidase, β-1,3-glucanase and protease). Trichoderma aureorivide URM5158 showed a high rate of antagonism as well as the activity of chitinase was high. Among all the inductors in the end of the experiment only acibenzolar-S-methyl severity showed high rate and did not differ from control. Salicylic acid stood out among the abiotic inducers and T. aureorivide URM5158. The Trichoderma aureoviride URM5158 species has the potential antagonistic to Colletotrichum lindemuthianum URM3149; show potential inducers against severity of bean anthracnose.