Abstract: The 4×4 incomplete diallel crossing was produced between 4 irrigated field winter wheat varieties and 4 dry field winter wheat varieties.Both combining abilities and genetic abilities of major characters of wheat hybrids from two ecological varieties were studied.The results showed that the general combining abilities of irrigated field parents had significant effects at 5% and 1% level on major characters of wheat hybrids (except 1000 grain weight).The general combining abilities of dry field parents had significant effects on the characters related to drought resistance,such as plant height,stem length under spike,spikes per plant,harvest index etc.Except plant height and harvest index,the variance of parent 1 was larger than that of parent 2.This indicated irrigated field parents had larger effects on yield characters,and dry field parents had significant effects on the characters related to drought resistance.Plant weight,stem length under spike,grains per spike,yield per plant and harvest index showed additive inheritance,while dominance gene had much effects on spikes per plant,1000 grain weight and weight per spike.The heritabilities of yield characters of dry land wheat varieties were lower,the heritability of the characters related to drought resistance,such as stem length under spike,harvest index were higher.

Key words: Winter wheat, Irrigated-field and dry-field ecological type, Cross model, Combining ability, Genetic parameter

CLC Number: 

• S512.103