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Birsa Agricultural University, Ranchi

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Subject: Plant Breeding × Author: Choudhary, Vinay Kumar × End date: 2019 × Start date: 2013 × Type: Thesis ×
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    ThesisItemOpen Access
    GENERATION MEAN ANALYSIS OF YIELD AND YIELD ATTRIBUTING TRAITS IN LINSEED (Linum usitatissimum L.)
    (Birsa Agricultural University, Kanke, Ranchi, Jharkhand, 2016) Choudhary, Vinay Kumar; Ram, Sohan
    A study was conducted at Ranchi Agricultural Research farm and Chianki Research farm during Rabi 2013-14 to evaluate 6 populations i.e. P1, P2, F1, F2, BC1 and BC2 from six different crosses for generation mean analysis. Investigation was carried out on variability, nature and magnitude of gene effects, their interactions, heterosis and inbreeding depression for 17 traits i.e. days to 50 per cent flowering ,days to maturity, plant height ,number of primary branches per plant, number of capsules per plant, number of seeds per capsule, capsule diameter, seed yield per plant, test weight, oil content, palmitic acid content, stearic acid content, oleic acid content, linoleic acid content, linolenic acid content, wilt disease reaction and rust disease reaction. Thirty treatments consisting 5 parents, 6F1s, 6F2s, 6BC1s, 6BC2s and one check (LC-54) has laid out in randomized block design with three replications. The analysis revealed highly significant variation among the treatments for all the characters under study at both the locations. Phenotypic and genotypic co-efficient of variation was high for plant height, number of primary branches per plant , number of capsules per plant , wilt disease reaction, rust disease reaction and seed yield per plant at both the locations showing the presence of variability among the treatments for yield and yield attributing traits. Similarly high to moderate heritability as well as genetic advance was recorded for number of capsules per plant, rust disease reaction, wilt disease reaction, oleic acid content and linolenic acid content indicating that breeding for these traits can be use in the development of these traits. The estimates of additive and dominance components through joint scaling test as well as epistasis interaction through six parameter model indicated that additive component has significant role in the expression of number of primary branches per plant, number of seeds per capsule, capsule diameter and test weight at both the locations indicating that transgressive segregants of these characters can be useful in improvement of these traits in segregating generations. Dominance component played a major role in controlling the expression of number of primary branches per plant, number of seeds per capsule, seed yield per plant, test weight and rust disease reaction at both the locations. Among epistatic gene interactions, additive x additive (i) and dominance x dominance (l) interactions effect showed significant impact in comparison to additive x dominance (j) interaction in controlling the expression of plant height, primary branches per plant, number of capsules per plant, number of seeds per capsule, capsule diameter, days to maturity, seed yield per plant, oil content, wilt disease reaction and rust disease reaction by additive x additive (i) interaction, days to 50 per cent flowering, plant height, number of capsules per plant and number of seeds per capsule by dominance x dominance (l) interaction and days to 50 per cent flowering, plant height, number of capsules per plant, days to maturity, oil content, wilt disease reaction and rust disease reaction by additive x dominance (j) interaction at both the locations. Almost all the crosses for all the traits under study exhibited duplicate type of gene action at both the locations whereas few crosses showed complimentary gene action for respective traits at only Ranchi location. Heterosis estimate revealed that the crosses Meera x T-397 and Shekhar x T-397 were found to be the best crosses at both the locations considering the heterotic advantage of these crosses over mid parent, better parent and economic check LC-54. The heterosis manifested in these two crosses were mainly due to desirable heterotic response of important yield component traits like, number of primary branches per plant, number of capsules per plant , number of seeds per capsule, capsule diameter and test weight indicating that development of hybrids and better segregants based on these traits can be fruitful.