PJB-2018-237
Exploring the inheritance mechanism of flowering and yield attributes in facultative × spring wheat crosses through line × tester analysis
Muhammad Ishaq
Abstract
To break the yield barrier introgression of gene pool of facultative winter wheat into spring wheat is one of the potential approaches to increase the wheat yield. For this purpose, six diverse facultative winter wheat lines of semi-arid (FWWL-SA) origin were crossed to three spring bread wheat cultivars via line × tester mating design during 2013-14. In the 2014-15, six facultative winter wheat lines, 3 spring wheat testers and their 18 F1 hybrids were evaluated in randomized complete block design with three replications. Highly significant genotypic differences were observed for the studied traits. Analysis of combining ability revealed significant variations among the lines, testers, lines × testers, lines vs. testers and parents vs F1. Based on general combining ability for days to maturity, reduced plant height and grain yield, FAWWL-2 was found as the best among the lines while among the testers ‘Parula’ was found as the best for early maturity and shorter plant height. For grain yield, AARI-2011 was found as the best general combiner among the testers. Hybrid combination FAWWL-1 × AARI-2011 for days to maturity, FAWWL-4 × Parula for plant height, FAWWL-6 × Punjab-2011 for spike length, and FAWWL-4 × AARI-2011 for grains spike-1 were found best based on specific combining ability effects. For grain yield, crosses i.e., FAWWL-6 × AARI-2011, FAWWL-2 × Parula and FAWWL-4 × AARI-2011 were found as best specific combiners/potential crosses involving high × high GCA effects of lines and testers. Ratio of GCA variance to SCA variance showed predominance of non additive gene action for all the studied traits which was further confirmed by higher value of dominance variance as compared to additive variance. Further, ratio of σ2A/σ2D being less than one and degree of dominance (σ2D/σ2A)1/2 greater than unity indicated the preponderance of non additive gene action. The current research suggests that selection of these different wheat lines could be delayed to late segregating generations to derived potential lines for the six economically important traits.
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