森林研究: オープンアクセス
オープンアクセス

概要

Heterosis for Seed Fibre Quality Traits Cotton (Gossypium hirsutum L. )

Rani Chapara, Sudharani Madugula

Study of heterosis is very crucial to identify the promising hybrid combinations for further advancement of the material and also to exploit as such for commercial cultivation of hybrids. The objective of this research was to estimate the heterosis of all types i.e. mid parantal heterosis, heterobeltoisis and standard heterosis for fibre quality parameters. Nine genotypes and 20 F1 hybrids derived by crossing the parental genotypes in L × T design were sown in randomized complete block design along with standard check Suvin. It was observed that the line × tester interactions made greater contribution to the total variance for all the fibre quality traits studied. Proportional contribution of lines to total variance was very low for all the traits, while testers also followed similar pattern and contributed a minimum to the total variance. However, maximum variance was extended by line × tester interaction for all the fibre quality traits studied. Out of evaluated 20 hybrids, the cross combinations namely, TCH1716 × GJHV 516, BGDS1033 × HYPS152 and TCH1716 × HYPS152 were found to be promising for Upper half mean length mean length of the fibre as they showed highest mean performance and significant positive heterosis. Further, the hybrid F2423 × HYPS152 was found to be more fine fibre and showed highest heterosis. However, the most promising hybrids for strength were TCH1716 × L766 and TCH1716 × HYPS152, while the highest heterotic effect elongation per cent was shown by TCH1716 × GJHV516. It indicated larger scope for heterosis breeding for commercial exploitation of heterosis. These promising cross combinations showing desirable heterosis over standard check can be advanced for isolation for further exploitation to improve fibre quality traits.