Author(s):

D Bhadru, B Srinivas, L Krishna and Y Chandra Mohan

Abstract: The present investigation was conducted to evaluate 68 hybrid rice materials, their parents involving four cytoplasmic male sterile lines and 17 restorer lines along with four checks for their phenotypic stability and its inheritance across two different agro-climatic zones of Andhra Pradesh, South India. Substantial portion of genotypes and environment interactions was due to the linear component for panicle weight, flag leaf length, flag leaf width, productive tillers per plant, filled grains per panicle, 1000 grain-weight and grain yield per plant indicated that significant variability among the experimentation could be predicated. Based on the positive values of environmental indices, Jagtial rabi season was found to be most favourable location for seed yield per plant. In the present study three CMS lines IR-79156A, DRR- 14A and IR-68897A and testers R-43, R-465, R-47, R-49, R-56, IR-64, IR-66, DRR-714-1-2-R and IR-10198 were identified as stable parents -over four environments for yield and its important components can be used for developing stable hybrids. Considering the yield and its component traits, high yielding hybrids viz., DRR-14A x R-43, IR-80555A x R-54, IR-68897A x R-43, IR-68897A x R-48, IR-68897A x R-56 were stable and appear to be promising in both kharif and rabi season of Telangana region, recommended for multilocation trials. The pattern of inheritance of stability is different for different characters and also for different genotypes for the same character. Outcome of this study is stable hybrids that involved stable parents but stable parents need not necessarily generate stable hybrids.

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