قدرة الائتلاف و الفعل الجيني و التحسين الوراثي المتوقع في القطن Gossypium hirsutum L.

Abstract EN

A half diailel analysis of six cultivars of upland cotton and their crosses were studied using a randomized complete block design with two replication.

Data were taken on yield and its components to measure the nature of combining ability and to estimate the components of variance and genetic parameters.

The values of specific combining ability components was more than that of general combining components for all characters.

The dominance genetic variance were more than the additive one for all characters , and the narrow—sense heritability ranged from 2.72% for boll number to 35.65% for boll weight.

The estimates of average of degree of dominance was exceeded one for all characters, indicating that there over - dominance for these characters.

The estimated values of expected genetic advance were low for all studied characters ranged from 0.64% for seed index to 5.47% for boll weight.The results suggests that the pedigree selection method is suitable in the {improvement of cotton.