درجة التوريث و التقدم الوراثي و معاملي الارتباط المظهري و المرور لبعض الصفات الكمية في هجينين من الذرة الصفراء (Zea mays L.)‎

Abstract EN

The experiment was carried out at two planting dates in a Randomized Complete Blocks Design with three replications at Maize Research Department, General Commission for Scientific Agriculture Researches (G.C.S.A.R.) Damascus, Syria, during two cropping season 2011 and 2012 to study the phenotypic and genotypic coefficients of variation, heritability, genetic advance, phenotypic correlation and path coefficient analysis for grain yield per plant, its components and the height of plant and ear of two maize hybrids (IL.292-06 × IL.565-06, IL.459-06 × IL.362-06).

Results showed that the phenotypic variations were greater than genotypic ones for all investigated traits in the two crosses at the two planting dates, indicating greater influence of environment on the expression of these traits.

Broad sense heritability was greater than the narrow sense for all traits.

Highly and moderate narrow sense heritability values for some traits at early planting date correlated with positive genetic advance, indicating that additive gene action involved in the inheritance of these traits, and the importance of the selection to improve these traits at the early planting date and in the early segregation generation.

Correlation coefficients among traits indicated that grain yield per plant was positively and significantly associated with ear length (from 0.139 to 0.312**), number of rows per ear (from 0.087 to 0.433**), number of kernels per row (from 0.002 to 0.450**) and 100 kernel weight (from 0.111 to 0.175* ) of the two planting dates.

The path coefficient results showed that each of number of kernels per row, number of rows per ear and ear length had high positive direct effects on grain yield.