Abstract
Maize grey leaf spot (GLS) disease remains an important foliar disease in sub-Saharan Africa accounting for more than 25% yield losses in maize. Information on inheritance of GLS resistance of germplasm adapted to African environments is required in new sources being identified. Therefore, hybrids generated from a 10 × 10 half-diallel mating of tropical advanced maize inbred lines were evaluated in six environments to determine combining ability, genotype × environment interaction (G × E) and the impact of GLS disease on grain yield. General combining ability effects were highly significant and accounted for 72 and 68% of the variation for GLS resistance and grain yield, respectively. Significant specific combining ability effects associated with reduced disease levels were observed in some hybrids when one parent was resistant, and these may be exploited in developing single cross maize hybrids. Regression analysis showed a 260–320 kg ha−1 decrease in maize grain yield per each increase in GLS disease severity score, and significant associations (r = −0.31 to −0.60) were observed between grain yield and GLS severity scores. This showed the potential of GLS disease to reduce yield in susceptible varieties grown under favourable disease conditions, without control measures. Genotype and genotype × environment biplots and correlation analysis indicated that the significant G × E observed was not due to changes in hybrid ranking, implying absence of a significant crossover interaction. Therefore, predominance of additive gene effects imply that breeding progress for GLS disease resistance would be made through selection and this could be achieved at a few hot-spot sites, such as Baynesfield and Cedara locations in South Africa, and still deploy the resistant germplasm to other environments in which they are adapted.
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Acknowledgments
The researchers would like to thank the Rockefeller Foundation, New York for funding this work through the African Centre for Crop Improvement (ACCI) in South Africa. We are grateful to the International Maize and Wheat Improvement Centre (CIMMYT), Zimbabwe for providing germplasm, and the assistance of Dr Cosmos Magorokosho in generating some of the crosses in Harare. We also express our appreciation to the staff from the Crop Protection unit, Cedara, South Africa; Mr Walter Chivasa (SeedCo, Rattray Arnold Research Station, Zimbabwe); Mr Herbert Masole (SeedCo, Mpongwe, Zambia) and the ACCI support staff for the assistance in running the trials.
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Sibiya, J., Tongoona, P., Derera, J. et al. Genetic analysis and genotype × environment (G × E) for grey leaf spot disease resistance in elite African maize (Zea mays L.) germplasm. Euphytica 185, 349–362 (2012). https://doi.org/10.1007/s10681-011-0466-2
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DOI: https://doi.org/10.1007/s10681-011-0466-2