Abstract
With 1 figure and 6 tables Abstract Heritability and gene effect estimates for components of partial resistance to grey leaf spot were evaluated in Eastern Tanzania, using three populations derived from grey leaf spot partial-resistant maize inbred lines K36 and P103 and susceptible inbred lines CML 395-5 and L37 by generation mean analysis. Populations included the resistant parents (P1), susceptible parents (P2), F1 and F2 generations and backcross BC1 and BC2 generations. Significant differences between generations, crosses and generation × cross and generation × location interactions were detected. Measurements for components conferring partial resistance to grey leaf spot behaved in a quantitative manner. The magnitude of additive, dominance and epistatic effects varied between crosses and components. Broad- and narrow-sense heritability estimates were high for disease severity, lesion length and lesion size but lower for incubation period. Results have shown that lesion size, lesion length, lesion numbers and disease severity could be used for selection of partial resistance to grey leaf spot based on field measurements.
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