Genetic Analysis of Yield and its Attributes in Bread Wheat (Triticum Aestivum L. Em. Thell) Under Irrigated and Rainfed Conditions

Abstract

Experiments were conducted to study the genetics and combining ability for yield and its attributes under Irrigated (E1) and Rainfed (E2) conditions using F1 hybrids derived from Line X Tester mating design by crossing eleven lines with three testers. Significant differences were observed among all the genotypes for all the traits in both E1 and E2 environments as well as in pooled analysis. The σ2gca/σ2sca ratio indicated predominance of non-additive gene action for all the characters in both environments. Therefore, this component of variance can be utilize in breeding programme through exploitation of heterosis and the selection process for identification of superior plant type should be postponed to further generations like F4 or F5. VL3001 and KACHU*2//WHEAR/SOKOLL was identified as good general combiner in irrigated condition (E1) and in rainfed condition (E2), respectively for maximum number of traits. Parent VL3001 was also identified as good general combiner for maximum number of traits in case of pooled analysis. Cross BECARD/KACHU × WH1080, BOW/VEE/5/ND/VG9144//KAL/BBB/YACO/4/CHIL/6/CASKOR/3/… × WH1080 and C306 × WH1142 was identified as good specific combination for maximum number of traits in irrigated condition (E1), rainfed condition (E2) and in pooled analysis, respectively.

Estimation of Combining Ability in Bread Wheat Using Line X Tester Analysis

“…Significant (P≤0.05 or 0.01) positive GCA effects estimated for HI for line L3, L7 and tester T3. These consequences are in arrangement with those reported by El-Gammaal et al [6], Abro et al [7], Roy et al [8], Ijaz et al [10], Rajput et al [11], Alhossary et al [12], Gupta et al [13] and Chaudhary et al [14]. In self-pollination species, specific combining ability (SCA) effects can be utilizing to select lines with homozygosity that appear transgressive segregation in early generations.…”