مرکز منطقه ای اطلاع رساني علوم و فناوري -

چكيده لاتين :

In order to estimate combining ability and gene action of a mnnber of rice cultivars, a 5x5 half a diallel cross genetic design has been used. Parents and their hybrids have been evaluated in a randomized complete block design with 3 replicates for yield and 6 yield components in 2007 in Rice Research Station of Iran -Amol. Mean squares of genotypes for all traits were highly significant (p<0.01). Significant mean squares of combining ability for all traits showed additive and non-additive effects in control of the related traits. Having nonsignificant MS (GCA) ratio for all traits but 10uo-grain weight show higher importance of nonadditive effects MS (SCA) in comparison with additive effects of controlling genes. High relative importance of specific combining ability indicated that all traits but 1000-grain weight are highly affected by impacts of specific combining ability. Generally, Dasht, Neda and Binarn were the best parents for general combining ability and Binarn xIR62871-17 51- 10 and Mashhad Domsiah-Binam were the best hybrids for grain yield and its components