National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Development of drought tolerant lines becomes increasingly more important in maize. Therefore, an investigation was undertaken with six lines VIM 57 (L1), VIM 61 (L2), UMI 1200 (L3), VIM 244 (L4), VIM 15 (L5), VIM 108 (L6) and four testers VIM 236 (T1), VIM 93 (T2), VIM 418 (T3), VIM 153 (T4) which were crossed in a Line x Tester mating design to synthesize twenty four hybrids and were evaluated under contrasting soil moisture regimes to identify the potential parents, superior cross combinations and to formulate the breeding strategies for yield improvement in maize. The selection indices of drought included Anthesis Silking Interval (days), Relative Water Content (%), Leaf Rolling, Root dry weight (g), Root volume (cm3) and Drought Recovery Rate. Results of the study revealed significant differences among the hybrids for all measured traits. The relatively smaller proportion of GCA to SCA ratio indicated the predominance of non-additive genetic effects for all the traits under study. Under induced moisture stress conditions, the parents L5 (Plant height, ASI, RWC), L3 (Cob weight and Grain yield), L4, L1 (Cob length) and T4 (Days to flowering, Number of kernels per row, Leaf rolling and RWC) had desirable per se and gca effects. On the basis of per se, sca and standard heterosis, under induced moisture stress, the hybrids L2xT1 (VIM 61 x VIM 236), L3xT2 (UMI 1200 x VIM 93), L3xT4 (UMI 1200 x VIM 153), L4xT4 (VIM 244 x VIM153) and L6xT3 (VIM108 x VIM 418) were found to be desirable for yield/plant and most yield components under drought. The hybrid L3 x T4 (UMI 1200 x VIM 153) recorded positively significant values for grain yield and considered as the best hybrid for both the conditions. The study revealed that the identified hybrids showed desirable heterotic levels for yield and drought parameters that are desirable in areas with marginal rainfalls and could be utilized in maize breeding programs.
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