Grain-yield stability among tropical maize hybrids derived from doubled-haploid inbred lines under random drought stress and optimum moisture conditions
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Date
2018
Journal Title
Journal ISSN
Volume Title
Publisher
Crop and Pasture Science
Abstract
Drought is a devastating environmental stress in agriculture and hence a common target of plant breeding.
A review of breeding progress on drought tolerance shows that, to a certain extent, selection for high yield in stress-free
conditions indirectly improves yield in water-limiting conditions. The objectives of this study were to (i) assess the
genotype environment (GE) interaction for grain yield (GY) and other agronomic traits for maize (Zea mays L.) across
East African agro-ecologies; and (ii) evaluate agronomic performance and stability in Uganda and Tanzania under optimum
and random drought conditions. Data were recorded for major agronomic traits. Genotype main effect plusGE(GGE) biplot
analysis was used to assess the stability of varieties within various environments and across environments. Combined
analysis of variance across optimum moisture and random drought environments indicated that locations, mean-squares for
genotypes and GE were significant for most measured traits. The best hybrids, CKDHH1097 and CKDHH1090, gave GY
advantages of 23%and 43%, respectively, over the commercial hybrid varieties under both optimum-moisture and random drought
conditions. Across environments, geno typic variance was less than the GE variance for GY. The hybrids derived
from doubled-haploid inbred lines produced higher GY and possessed acceptable agronomic traits compared with the
commercial hybrids. Hybrid CKDHH1098 ranked second-best under optimum-moisture and drought-stress environments
and was the most stable with broad adaptation to both environments. Use of the best doubled-haploids lines in test cross
hybrids make-up, well targeted to the production environments, could boost maize production among farmers in East Africa.
Description
Keywords
Correlation, East Africa, G-E interaction, Heritability, Management
Citation
Sserumaga, J. P., Beyene, Y., Pillay, K., Kullaya, A., Oikeh, S. O., Mugo, S., ... & Kiula, B. (2018). Grain-yield stability among tropical maize hybrids derived from doubled-haploid inbred lines under random drought stress and optimum moisture conditions. Crop and Pasture Science, 69(7), 691-702. https://doi.org/10.1071/CP17348