Combining ability for grain yield and other related traits in bread wheat (Triticum aestivum L.)
Keywords: Triticum aestivum, combining ability, yield attributes.
AbstractCombining ability for grain yield and other related characters was studied in 36 F1s along with 15 parents (12 lines and three testers) which were evaluated in a completely Randomized Block Design (RBD) with three replications during rabi 2005-06.The results indicated that among various lines, line HD 2687 was identified as a good general combiner for the characters days to heading, days to maturity, plant height and biological yield per plant, whereas, Line UP 2338 appeared as a good general combiner for the characters, plant height, tillers per plant, spikelets per ear, spike length, grains per ear and 1000-grain weight. Line 35th IBWSN-4 for days to maturity and harvest index; Line 35th IBWSN-14 for days to maturity, grains per ear and grain yield per plant; 10th HTWYT-47 for days to heading, days to maturity, tillers per plant and grains per ear; 11th HRWYT-7 for the characters spike length, 1000- grain weight, harvest index and grain yield per plant and 4th IAT-49 for tillers per plant, plant height and harvest index were identified as good general combiners. Lines 20th SAWSN-18, CPAN 3004 and RD 1008 were identified as good general combiners for days to heading, tillers per plant and biological yield per plant, respectively. Tester PBW 373 emerged as a good general combiner for the characters days to heading and biological yield per plant, whereas, Tester PBW 502 appeared as a good general combiner for the tillers per plant. Out of 36 cross combinations, nine crosses viz. UP 2338/ PBW 502, 4th IAT-49 / PBW 502,11th HRWYT-16/ PBW 343,10th HTWYT-47/ PBW 343, RD 1008/ PBW 373 , 35th IBWSN-14/ PBW 502, 20th SAWSN-18/ PBW 343, 35th IBWSN-4/ PBW 502 and CPAN 3004/ PBW 373 emerged with significant positive sca effects for grain yield per plant. The parents involved in these crosses are average x average general combiners and or poor x average combiners except in cross 35th IBWSN-14/ PBW 502 (3.14), which involved good x average general combiners. Desirable specific combining ability of the crosses involving such parents seems to be mainly due to complementation of the genes. Thus these crosses can be exploited for grain yield per plant by using biparental mating system
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