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Subject: Plant Breeding × Author: Dadhich, Shailendra × End date: 2016 × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    Genotype x environment interaction and stability in maize (Zea mays L.) hybrids
    (CCSHAU, 2007) Dadhich, Shailendra; Dhakla, M.S.
    An experiment was conducted to study the stability, correlation and path coefficient for grain yield and its attributing traits in 22 maize hybrids in three environments (based on Nitrogen fertilizer doses) at Regional Research Station, Uchani (Karnal), CCS HAU, Hisar. The observations were recorded on 11 quantitative traits namely days to 75% tasseling, days to 75% silking, days to maturity, cob placement, internodal length, plant height, cob length, cob girth, grain yield, 100-kernel weight and shelling percentage. The analysis of variance showed significant differences due to genotypes for all the traits in all the three environments. Estimates of environment index revealed that E1 (75% Nitrogen dose of the recommended dose) was the most favourable environment for majority of the characters. The G x E interaction was highly significant for days to maturity, cob placement, internodal length, plant height and grain yield (gm/plant) characters. Its partitioning into linear and non-linear components revealed preponderance of non-linear component for all the characters. The hybrid NECH-132 was the best hybrid on the basis of its overall mean performance. Besides high grain yield, it exhibited stable performance across the environments for grain yield and also for cob length, cob girth and 100-kernel weight. Correlation study revealed that grain yield was mainly a component of cob girth, cob length and 100-kernel weight in all the three environments. The path coefficient analysis suggested the importance of 100-kernel weight for grain yield as its direct contribution was most consistent over the environments. Two other important characters i. e. cob length and cob girth showed the varied effect of environment on the root of their contribution to grain yield. Hence, while breeding for increased grain yield main emphasis should be given on 100-kernel weight.