Abstract
Race Diversity and Complexity in Populations of the Sorghum Anthracnose Fungus Colletotrichum graminicola
Highlights
RESUMO – A diversidade fenotípica de Colletotrichum graminicola, agente causal da antracnose em sorgo, foi analisada através da virulência em dez linhagens de sorgo
Dilatory resistance, characterized by a slow rate of disease development, suffices for the control of sorghum anthracnose in some areas of the country, but a specific host-pathogen interaction is known for some sorghum genotypes and pathogen isolates, which indicates that at least a portion of the dilatory resistance of sorghum to C. graminicola is race specific, and, could be of low durability (Guimarães et al, 1998)
New combinations are selected based on a pathogenicity association coefficient (PAC) and a virulence association coefficient (VAC), according to Browder & Eversmeyer (1977)
Summary
RESUMO – A diversidade fenotípica de Colletotrichum graminicola, agente causal da antracnose em sorgo, foi analisada através da virulência em dez linhagens de sorgo. New combinations are selected based on a pathogenicity association coefficient (PAC) and a virulence association coefficient (VAC), according to Browder & Eversmeyer (1977). Based on these coefficients, desirable combinations for disease control area characterized by a high PAC and a low VAC, so that the greatest portion of the population will be avirulent on both A and R lines. The objective of this work was to evaluate the pathotype diversity and complexity of three populations of C. graminicola, and to identity new combinations of sorghum genotypes potentially useful as sources of durable and stable resistance to this pathogen
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