Genetic Analysis of Grain Yield per Spike and Some Agronomic Traits in Diallel Crosses of Bread Wheat (Triticum aestivum L.)

Authors : Nazan DAĞÜSTÜ

Pages : 249-258

View : 19 | Download : 5

Publication Date : 2008-07-01

Article Type : Research Paper

Abstract :To introduce new germplasm into breeding programs in Turkey, 3 lines [Samsun - 46 insert ignore into journalissuearticles values(S - 46);, Samsun/Bafra - 333 insert ignore into journalissuearticles values(SB - 333);, Population - 311 insert ignore into journalissuearticles values(P - 311);] and 4 cultivars [Marmara - 86 insert ignore into journalissuearticles values(M - 86);, Gönen, Golia, and Pehlivan] of bread wheat insert ignore into journalissuearticles values(Triticum aestivum L.); were crossed in 7 x 7 diallel crosses. The trials were conducted at Uludağ University, Research and Training Center, Turkey, over 3 years insert ignore into journalissuearticles values(in 2000/01, in 2001/02, and in 2002/03);. The 7 parents and 42 crosses were grown in a randomized complete block design with 3 replications for 2 years. The genetic analysis insert ignore into journalissuearticles values(variance, combining ability, correlations, and path coefficient analysis); of grain yield per spike insert ignore into journalissuearticles values(GYS); and some agronomic traits [plant height insert ignore into journalissuearticles values(PH);, spike length insert ignore into journalissuearticles values(SL);, spikelet number per spike insert ignore into journalissuearticles values(SNS);, kernel number per spike insert ignore into journalissuearticles values(KNS);, and 1000 kernel weight insert ignore into journalissuearticles values(TKW);] were evaluated. Differences among parents and hybrids were significant. General combining ability insert ignore into journalissuearticles values(GCA); effects were highly significant for all the components, while specific combining ability insert ignore into journalissuearticles values(SCA); effects were significant only for PH, GYS, and TKW. General reciprocal effects for PH and GYS and the correlations for GYS and yield components were significant in both years. Path analysis indicated that KNS had the highest effect on GYS, followed by TKW. The parents Gönen and S - 46 for KNS and P - 311 and SB - 333 for TKW and GYS showed positive GCA values in both years. They could be considered for developing desirable progenies in selection programs.
Keywords : Wheat Triticum aestivum L, , combining ability, correlation and path coefficient analysis