Variabilidade patogênica de Colletotrichum graminicola isolado de milho (Zea mays L.). / Pathogenic variability of colletotrichum graminicola (ces.) g. w. wils. from maize (zea mays l.).

AUTOR(ES)

Mauricio Pires Machado Barbosa

DATA DE PUBLICAÇÃO

2002

RESUMO

Anthracnose leaf blight and stalk rot of corn are importa nt diseases in maize caused by Colletotrichum graminicola, and are considered to be very important in production corn areas throughout the world and Brazil. The control is based only on genetic resistance. The effectiveness of genetic resistance to control plant diseases depends on the existence of races of pathogens, able overcome them. Trials to study pathogenic and genetic variability of Colletotrichum graminicola from maize were done using isolates from brazilian states Minas Gerais, Goiás, Mato Grosso do Sul, São Paulo and Maranhão. Isolates were geneticaly compared using RAPDs molecular markers. After clustering, five isolates were choosen in order to conduct virulence and agressiveness experiments in maize inbred lines. Trials were conducted in field for evaluation of stalk rot and at green house to evaluate anthracnose leaf blight. Field trials did not show diferential interaction between isolates and host genotypes, neither studing anthracnose leaf blight, nor anthracnose stalk rot, driven to conclusion that, for genotypes and isolates used in this study, we re not able to identificate races of Colletotrichum graminicola. There was no correlation between stalk lesion area and leaf blighted area, showing that genetic resistance pathways were different.

ASSUNTO(S)

fungo fitopatogênico podridão (illness of plant) antracnose podridão (doença de planta) maize milho

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