Question

Which of the following correctly explains the concept of 'Physiologic Races' (or pathotypes) in a plant pathogen such as Puccinia (rust fungi), and its practical significance for plant breeders developing resistant varieties?

A Strains of one pathogen species with differing host-specific virulence
B Physiologic races refer to different geographic locations where the pathogen is found, with no genetic difference
C Physiologic races refer only to the different life-cycle stages of the same pathogen
D Physiologic races have no impact on breeding programmes
E Physiologic races are a classification based on pathogen colour alone
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