Graphical and conventional Line x Tester analyses for seed yield and attributes in fieldpea (Pisum sativum L.)
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Date
2023-06
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CCSHAU, Hisar
Abstract
In self-pollinated crop like fieldpea, recombinant breeding is the most desirable approach to combine various desirable attributes. In the present study, genetic variation, combining ability and heterosis were studied for days to flowering and maturity, primary and secondary branches per plant, nodes per plant, height of first pod, plant height, pods per plant, seeds per pod, 100-seed weight, biological and seed yield per plant and harvest index in fieldpea (Pisum sativum L.) using line x tester design involving ten lines, three testers and their 30 crosses and comparisons were made between the conventional and graphical approaches. The presence of adequate variability was revealed by significant differences among the parents and hybrids for almost all the traits studied. The meansquares due to parents vs crosses emerged significant for most of the traits revealing adequate amountof heterosis. Narrowdifferences between PCVand GCVof different traits indicated lesser influence of environment on the expression of these traits. Low heritability coupled with low genetic advance were observed for most of traits suggesting that these traits are genetically controlled by non-additive gene action. Among lines, HFP 715, RFP 2009-2 and GP02/1108 and among testers HFP 1711 exhibited good general combining ability and among the crosses Indira Matar 1 x HFP 1428, DDR23 x HFP 1711, GP 02/1108 x HFP 1428 expressed significant SCA for seed yield and its attributing traits according to conventional analysis. The lines and crosses exhibited superiorityin the present study can be exploited for isolating desirable transgressive segregants in advanced generations in future fieldpea improvement programmes. The σ2GCA/σ2SCA and the degree of dominance indicated predominant roleofdominancegeneaction.ThecrossesIndiraMatar1xHFP1711,AmanxHFP1711,GP02/1108 x HFP 1711, IPF 14-13 x HFP 1428 expressed significant desirable heterobeltiosis for seed yield andits attributing traits These may be utilised in crop improvement programme to obtain transgressive segregants in later generations. Graphical analysis results were almost same to those of traditional analysis with some variations. These methodologies provided easily interpretable output and it can be inferred that PCA biplot method can be used alone or together with GGE biplot method for evaluating parents and crosses in a line × tester design.