Gene action, combining ability and standard heterosis for seed cotton yield and fibre quality components in upland cotton

Abstract

Twelve parental genotypes and twenty F 1 hybrids developed in a Line x Tester fashion were used in the present study to estimate gene action, combining ability and standard heterosis for eleven quantitative and five quality traits in cotton. All the traits studied exhibited greater SCA variance than GCA except days to fifty per cent flowering suggesting that these traits are controlled by dominant gene action. Among the parents used, SVPR 2 and TSH 325 were detected with higher general combining ability for seed cotton yield and should be given importance while developing hybrids or recombinants. The hybrids namely SVPR 2 x TSH 325, SVPR 2 x Suraj and GJHV 370 x PBH 116 were identified as the best hybrids for seed cotton yield and SVPR 2 x TCH 1828 for fibre properties and recommended for heterosis breeding. Besides, the hybrid between GJHV 370 x CPD 1702 was suggested for recombination breeding for earliness and ginning percentage as it fulfilled the criteria of non-significant sca effects for hybrid and significant gca effects for respective parents.

Combining ability and heterosis for yield contributing and fibre quality traits in the hybrids of Gossypium hirsutum L.

“…The highest mid parent and better parent value was observed for the trait upper half mean length in the cross TCH 1199 × RHC 1409 (19.37%, 15.16%). The cross CO 14 × GTHV 323 had a maximum mid parent value (10.38%) for the elongation length and Monicashree et al (2017) and Khokhar et al (2018) also confirmed the non-additive gene action that was appeared to be dominant in the traits viz., the number of sympodia per plant, the number of bolls per plant, boll weight and seed cotton yield per plant as suggested by Gnanasekaran et al (2021). Non-additive gene action results due to the lack of association between per se performance and the gca effects of parents i.e., either having values of high mean with low gca effects or vice versa.…”

Combining ability analysis in Indian mustard [Brassica juncea (L.) Czern & Coss.] involving Ogura CMS system

“…Previous studies have shown that parents with good per se performance might not produce useful progenies when used in hybridization. The selection of appropriate parents for the improvement of elite hybrid depends on the selection of parents based on combining ability (Gnanasekaran and Thiyagu, 2021). Combining ability also gives information about the nature of gene action responsible for the inheritance of quantitative traits.…”