Combining Ability, Heterosis and Clustering Analysis of Hybrid Wheat Parents in Xinjiang Winter Wheat Region

To study the relationship between heterosis and combining ability among parents of AL type hybrid wheat in Xinjiang region, 72（8×9） F₁ hybrid combinations were prepared according to incomplete diallel cross of NCⅡ using 8 AL type stable sterile lines and 9 restorer lines with strong resilience, and the heterosis and combining ability effects of 7 agronomic characters of parents and hybrid combinations were analyzed. Heterosis groups were divided according to parental traits and general combining ability. The results showed that three-line wheat hybrid heterosis had universal in yield and yield traits, and was particularly important that one parent GCA or the sum of both parents GCA was positive and relatively large for parental selection of strong dominant combinations. Correlation analysis showed that parental dominance was positively correlated with the sum of paternal and maternal GCA values, and the GCA correlation between paternal and maternal was greater than the SCA correlation. According to the GCA effect value and phenotype value of 6 traits, the cluster analysis showed that the combination of parents with far combining ability could have a higher probability of strong dominance cross combination, and the complementarity of advantages between two parents with the same trait whose trait phenotype value was far away could also show strong heterosis in the offspring. The 17 parents were divided into 4 and 5 groups, which provided the basis for the preparation of strong and dominant combinations of AL type hybrid wheat.