بررسي اثرات ژن در كنترل صفات كمي در كلزا از طريق تجزيه و تحليل داي آلل

Study of Gene Effects for quantitative traits in rapeseed via diallel analysis

In order to determine combining ability, heritability and gene effects controlling quantitative traits of rapeseed (Brassica napus L.), 6 varieties (Foseto, Option 500, Gholiath, Kristin a, Shiralee and P. F-4570/91) were used in a compelet diallel crosses system. The experiment was carried out a simple lattice with a three replications at Agricultural Research Station Gharakhil (Mazandran) during 2003-2004. Analysis of variance showed that there were significant general (GCA) and specific (SCA) combining ability for the investigated characters except for grain yield and number of pod per plant. Also mean squares reciprocal crosses for all traits except number of seed per pod and number of secondary branches were significant. The additive and nonadditive effects for all of traits except for grain yield and number of pod per plant were significant. In this study degree of dominance for most traits was more than 1 and the narrow sense heritability of the most traits was low. This indicates the importance of non-additive effects controlling the evaluated traits. In general, Option 500 and Kristina varieties were the best parents and Go!iathxP.F-4570/91 is the best cross for yield performance.