Combining Ability, Heterosis and Clustering Analysis of Hybrid Wheat Parents in Xinjiang Winter Wheat Region
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摘要: 为了解新疆AL型三系杂交小麦亲本间配合力及其杂种优势关系，利用稳定不育系8份，恢复力强的恢复系9份，按照NCⅡ不完全双列杂交（8×9）设计配制72个F1杂交组合，对亲本及杂交组合的7个农艺性状进行配合力效应和杂种优势分析，再根据亲本性状和一般配合力划分杂种优势类群。结果表明，三系小麦杂交组合中普遍存在产量和产量性状杂种优势，针对强优势组合的亲本选择，双亲之一一般配合力（GCA）或双亲GCA之和为正值且相对较大；相关性分析表明，中亲优势与父本和母本GCA值之和呈极显著正相关，父本和母本的GCA相关性大于特殊配合力（SCA）相关性。针对6个性状的GCA效应值和性状表型值分别进行聚类分析表明，配合力距离远的亲本组配可能出现强优势杂交组合的几率较大，性状表型值距离较远的两个亲本同一性状之间的优势互补也可以在后代中表现出较强的杂种优势。将17个亲本划分为4个和5个类群，为后续AL型杂交小麦强优势杂交组合的配制提供了依据。Abstract: 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.
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Keywords:
- three-line hybrid wheat /
- sterile line /
- restorer line /
- combining ability /
- heterosis
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