PJB-2022-320
Determination G x E interaction and stability parameters for yield and component characters of newly developed single cross hybrids of maize (Zea mays L.)
Niranjan Kumar Chaurasia
Abstract
The present investigation entitled “Determination G x E interaction and stability parameters for yield and component characters of newly developed single cross hybrids of maize (Zea mays L.)†was carried out with seven inbred lines, twenty-one single cross hybrids which were developed through diallel matting scheme (Method II Model I) and three hybrid checks at six environments which comprises three locations and two crop growing seasons. The pooled analysis of variance for design of experiment over six environments indicated highly significant mean squares due to environments, genotypes, and genotype x environment interactions (GEI) for all the fourteen quantitative traits under study. Analysis of variance for stability of fourteen quantitative traits in maize over six environments revealed mean squares due to genotypes, Env. + (G x Env.), environment (linear) and pooled deviations were highly significant for all the characters under studied. The significant to highly significant mean squares due to G x E (linear) were observed for all the traits under study except for days to 50 per cent anthesis, days to 50 per cent silk, plant height, ear length, kernels per row and grains per plant. The higher magnitude of mean squares due to environment (linear) than the G x E (linear) were recorded for all the studied traits indicated that linear response of environment accounting for major part of the total variance. The estimates of environmental indices revealed the environment, E4 (Rabi 2019-20, BAU, Sabour) had highly positive environmental indices for all the traits under study. Hence, E4 was considered as the most favorable environment amongst the six environments for expression of all the studied characters. The estimates of stability parameters for grain yield per plant revealed nine hybrids, namely, P1 x P2, P1 x P4, P1 x P5, P2 x P4, P2 x P5, P3 x P4, P3 x P5, P4 x P7 and P5 x P6 had high mean grain yield, unit regression coefficient (bi=1) and non-significant deviation from regression (S2di=0) indicating these hybrids were stable for this trait over the test environments.
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