Genotype x Environment Interaction and Stability Analysis for Gran Yield of Diallel Cross Maize Hybrids Across Tropical Medium and Highland Ecologies
Journal of Plant Sciences
Volume 6, Issue 3, June 2018, Pages: 101-106
Received: Apr. 5, 2018; Accepted: Apr. 23, 2018; Published: Aug. 21, 2018
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Alphonse Nyombayire, African Centre for Crop Improvement, University of KwaZulu-Natal, Pietermaritzburg, South Africa; Reaserch Department, Rwanda Agriculture Board, Kigali, Rwanda
John Derera, African Centre for Crop Improvement, University of KwaZulu-Natal, Pietermaritzburg, South Africa
Julia Sibiya, African Centre for Crop Improvement, University of KwaZulu-Natal, Pietermaritzburg, South Africa
Claver Ngaboyisonga, Reaserch Department, Rwanda Agriculture Board, Kigali, Rwanda
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Genotype x environment (G x E) interaction is the differential performance of genotypes across environments, especially in the tropics where seasonal and spatial variability is large. This results in serious challenges of product selection across environments. The objectives of this study were to determine G x E interaction and yield stability of new diallel cross maize hybrids and to identify suitable genotypes for the medium and highland ecologies in Rwanda. Forty- five diallel cross maize hybrids and three commercial checks were evaluated in four locations representing the major agro-ecologies of Rwanda over three seasons. The data were subjected to genotype and genotype by environment interaction (GGE) biplot analysis, using Genstat statistical package. The analysis revealed two mega-environments which discriminated the hybrids. Two genotypes 3 (S1/S4) and 25 (S4/S5) displayed specific adaptation; qualifying them as candidates for further testing in respective mega-environments. Genotypes 3 (S1/S4) and 29 (S4/S9) demonstrated high yield and stability. Overall, the study revealed crossover interaction and there is need to breed for both broad and specific adaptation in these medium and high altitude environments.
Biplot, Genotype by Environment Interaction, Grain Yield, Maize Hybrids, Stability
To cite this article
Alphonse Nyombayire, John Derera, Julia Sibiya, Claver Ngaboyisonga, Genotype x Environment Interaction and Stability Analysis for Gran Yield of Diallel Cross Maize Hybrids Across Tropical Medium and Highland Ecologies, Journal of Plant Sciences. Vol. 6, No. 3, 2018, pp. 101-106. doi: 10.11648/j.jps.20180603.14
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