تقدير درجة التوريث و التقدم الوراثي و الفعل الوراثي في هجينين من الذرة الصفراء

Abstract EN

This study was conducted at the Department of Maize Research of the General Commission for Scientific Agricultural Research (GCSAR) Damascus, Syria, During 2010,2011, 2012, the aim was to study the genetic behavior for plant height, number of branches per tassel, number of leaves per plant, ear length, 100 grains weight and yield per plant, estimate heritability, the phenotypic and genotypic variability and genetic advance through the generation mean analysis of two hybrids of maize under stress and non stress conditions.

The results indicated there was high significant differences among five populations ) P1,P2,F1,F2,F3( for all studied traits and among the individuals of F2, F3 populations under stress and non stress conditions.

The hybrid (IL.

375-06 × IL.256-06) attained the highest value of heterosis for plant height and 100 grains weight according to mid parent, while the hybrid (IL.363-06 × IL.459-06) attained the best heterosis for most traits according to the better parent.

The value of phenotypic and genotypic variability were close denotation the importance of gene action in the behavior of studied traits.

The best values of broad sense heritability for yield per plant were 0.86, 0.80 for (IL.363-06 × IL.459-06) under non stress and stress conditions respectively, while the high values of narrow sense heritability and genetic advance were 0.39, 13.67 respectively for hybrid (IL.

375-06 × IL.256-06) under the first condition, and 0.41, 10.59 respectively for the hybrid (IL.363-06 × IL.459-06) under the stress condition.

Dominance and the non allelic interaction (Epistasis) were the most important in the inheritance of traits under stress and non stress conditions.