دراسة بعض المعايير الوراثية لصفة الغلة و مكوناتها في ثلاثة هجن من الذرة الصفراء (Zea mays L.)‎ المقاومة لحفار ساق الذرة Sesamia cretica

Abstract EN

The experiment was conducted in a randomized complete block design with three replicates at the Sianow Field Research Station of the General Commission for Scientific Agricultural Research of Syria, during summers of 2014 and 2015, to study the genetic parameters for cob length, cob diameter, number of rows per cob, number of kernels per row, 100 kernel weight and grain yield per plant using generations’ means analysis of three hybrids of maize, resistant (IL298-09 × IL257-09), intermediate resistance (IL262-09 × IL228-09), and sensitive (IL255-09 × IL286-09) to detect epistasis and estimates of six different parameters.

Results showed that the additive-dominance model was to large corn stem borer to demonstrate genetic variation and its importance in the inheritance of most studied traits.

Non-allelic gene interaction was found to control genetic variation in most studied traits.

The inheritance of all studied traits was controlled by additive and non-additive genetic effects, but dominance gene effects played the major role in controlling the genetic variation of the most studied traits.

It is suggested that the improvement of those characters needs intensive selection through later generations.

Having the phenotypic variation higher than its corresponding genetic variation for all studied traits suggested that the genotypic variance played the major role in controlling the genetic variation of the most studied traits.

Highly significant heterosis was found for all characters, as compared with inbreeding depression for all traits.

Narrow sense heritability and genetic advance were low in most cases due to the dominance of non-additive gene action in controlling genetic variation of the most studied traits.