Journal of FARM SCIENCES, Vol 29, No 2 (2016)

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Stability analysis of drought tolerant maize inbred lines across diverse environments

Cousin Musvosvi, Mruthunjaya C. Wali

Abstract


Twelve drought tolerant maize inbred lines were grown in replicated multi-environment trials. These inbred lines are maintained at All India Coordinated Maize Improvement Project (AICMIP), Agricultural Research Station Arabhavi (ARS Arabhavi), and are as follows: DMR-M-81, M4, FA6, DMR-M-83, GPM36, DMR-M-88, DMR-M-84, M39, M53, FA3, GPM43, and M53.The objective of this investigation was to identify high yielding and stable inbred lines which could be used to develop high yielding and stable hybrids targeted for production in areas with unreliable rainfall. A total of seven environments spanning over three locations and three seasons were used.  Grain yield data was collected in all the environments. Combined analysis across all environments showed that genotype main effect and genotype-by-environment interaction mean sum of squares were significant, suggesting presence of genetic variation and the differential response of genotypes across environments. Inbreds GPM36, DMR-M-88, M4, FA6 and M39 were top performers in terms of grain yield means across all environments. However, across managed drought environments, inbreds DMR-M-81, DMR-M-88, FA6, M39 and DMR-M-84 were the best. The genotype main effect plus genotype-by-environment (GGE) biplot method was used to identify high yielding and stable inbreds. The first two principal components, PC1 and PC2, explained 61.52 % of the GGE variation, implying that most of the information could be displayed in a PC1 vs PC2 biplot. The GGE biplot based on genotype-focused scaling for comparing genotypes with the ideal genotype showed the inbred lines  viz., DMR-M-88, FA6, GPM36, M39, and M53 as high yielding and stable. These inbred lines are an important genetic resource in so far as there is need for mitigatory measures against climatic changes. Use of these materials in breeding would help in stabilizing maize yields across diverse environments.


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