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 |
Breeding of wheat (Triticum aestivum L.) cultivars with improved adaptation to low-N fertilization has gained importance worldwide nowadays. The present investigation aimed to identify the best general combiners and parental combinations for recombination breeding under low nitrogen condition to improve the nitrogen use efficiency. Six parents and fifteen F1s were evaluated under 50 per cent nitrogen condition using randomized complete block design with three replications. In general, means of NUE of the three parents GW 322, 2 WYCYT 34 and K 9107 were higher in magnitude than those of the three other parents, UAS 323, RAJ 4248 and C306. Both GCA and SCA mean squares were significant, but the magnitude of GCA was lesser than SCA, for all studied traits suggesting the existence of a greater portion of non-additive than that of additive genetic variance in controlling the inheritance of these traits. In general, the best general combiners among the six parents were GW 322 followed by 2 WYCYT 34 and UAS 323 parents. The best SCA effects were exhibited by F1's namely, GW 322 × C 306, 2 WYCYT 34 × C 306, 2 WYCYT 34 × RAJ 4248 and K 9107 × C 306 for important NUE traits, grain yield and harvest index. Results suggest that parents having good GCA can be employed in recombination breeding while, the F1s with good SCA effects may be further advanced to select high NUE segregants with care taken for selection in later segregating generations under low-N conditions. Results indicate that the best-performing parents and hybrid crosses for grain yield and nitrogen use efficiency and their components could be employed in future breeding programs and it also suggests that selection should be postponed to later segregating generations under low-N conditions to develop N-efficient genotypes of wheat.
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