Combining ability studies on terminal heat tolerance in wheat (Triticum aestivum L.) under late sown irrigated condition using Line X Tester analysis

Abstract

The present investigation entitled "Combining ability studies on terminal heat tolerance in wheat (Triticum aestivum L.) under late sown irrigated condition using Line X Tester design" was carried out during rabi 2017-18 and 2018-19 at the All India Co-ordinated Wheat and Barley Improvement Project, B.T.C. College of Agriculture and Research Station (IGKV), Bilaspur (C.G.). The experiment was conducted in RBD involving six lines, three testers and 18 F1s hybrids of wheat with two replications for study of character associated with yield and yield contributing traits. The analysis indicated that variance due to treatments was highly significant for all the characters under studied. All the characters except spike weight were highly significant. GCA, SCA and additive effect was found highest for character of harvest index. Among the lines, CG 1015 (Chhattisgarh Gehu)-04 was found good general combining ability (GCA) effect for the character of peduncle length, spike length, number of seed per plant and biological yield per plant. MP 3336 was found good GCA effect for chlorophyll reflection index, harvest index and number of tillers per plant. HD 2285 was found good GCA effect for days to maturity, 1000 seed weight and canopy temperature depreciation. Among the testers, Halna was good GCA effect for the character of days to 50% flowering, days to maturity and spike length. PHSL 10 was good GCA effect for number of tillers per plant, spike weight, seed yield per plant and harvest index. Among the crosses, CG 1015 (Chhattisgarh Gehu-04) X HUW 661 was good specific combining ability (SCA) effect for seed yield per plant. MP 3336 X PHSL 10 was good SCA effect for number of spikelet per spike and number of seed per plant. HD 2932 X Halna was good SCA effect for spike weight and 1000 seed weight and crosses HD 2864 X Halna was good SCA effect for the character of canopy temperature depreciation and biological yield per plant.

Line by Tester Analysis to Estimate Combining Ability and Heterosis in Bread Wheat (Triticum aestivum L.)

“…Four crosses L1 × T3, L2 × T2, L4 × T1 and L5 × T2 for traits weight of grains/spike and 1000 grains weight in addition two crosses L1 × T2 and L3 × T2 of weight of grains/spike showed significant positive (P≤0.05 or 0.01) Sij effects, they considered a good donor for these traits. These results are in line with those reported by Sarwar (2016), Ijaz & Kaukab (2017), Rajput (2018), Ranjitha et al (2018), Shah et al (2018a), El-Gammaal (2019), Alhossary (2020), Dhoot et al (2020), Gupta et al (2020), Kizilgeci (2020), El Nahas & Ali (2021 and Roy et al (2021b). Gemmeiza 11 (L1), Sids 1 (L2), Sids 14 (L3), Misr 1 (L4), Misr 2 (L5), Sids 12 (T1), Sakha 94 (T2) and Giza 171 (T3), *,** significant at 0.05 and 0.01 levels of probability, 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.…”

“…Four crosses L2 × T2, L4 × T1, L5 × T3 and L7 × T3 for 1000 grains weight showed significant positive (P≤0.05 or 0.01) SCA effects, they considered a good donor for these traits. These results are in line with those reported by El-Gammaal et al[6], Ijaz et al[10], Rajput et al[11], Alhossary et al[12], Gupta et al[13], Ranjitha et al[15], Dhoot et al[16] and El Nahas et al[17], Isah et al[18], Ebana et al[19], Guzmán et al[20].…”