Abstract
The fitness of genetically transformed strains of the southern corn leaf blight fungus Cochliobolus heterostrophus was compared to that of the isogenic wild-type progenitor in competitive pathogenicity tests on maize plants. Fitness (an individual's contribution to the gene pool of the next generation) was assessed by monitoring the frequency of the transformed phenotype in mixed populations with the wild type after successive disease cycles. Transformants were less fit than the wild type in 92% of the competition tests (P=0.05) (...)
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