利用云蔗05-51作杂交亲本的育种效应分析OA

Sugarcane variety Yunzhe 05-51 was used as the parent and crossed with 45 elite domestic and international parental lines,resulting in a total of 48 cross combinations.Employing the family evaluation method,a systematic in-vestigation was conducted on nine traits in the sexual hybrid progeny,including cane yield,sugar yield,plant height,stalk diameter,number of millable stalks,and brix.The analyses encompassed variance analysis,heritability estimation,general and specific combining ability determinations,and cluster analysis.The 48 combinations exhibited rich genetic diversity in the traits.Among these,the coefficients of variation for yield-related traits such as cluster mass,brix mass,cane yield,and sugar yield all exceeded 30.00%,demonstrating substantial selection potential.In contrast,brix,a sugar-related trait,showed the lowest coefficient of variation(8.50%),indicating stronger genetic control and higher stability.For the tested sugarcane parental materials,significant or extremely significant differences(P<0.05 or P<0.01)were observed among male parents,female parents,and combinations for six major traits including plant height,stalk diameter,brix,number of millable stalks per cluster,single stalk mass,and brix mass.The contribution of parents and the selected combinations to the heritability of major traits in the progeny populations was ranked as follows:combina-tions(73.30%)>male parents(56.04%)>female parents(48.22%).Plant height and stalk diameter exhibited superior performance,with heritability exceeding 55.00%for the combinations,male parents,and female parents.Among the 48 tested sugarcane parental combinations,the elite male parents were identified including Yuetang 91-976,Yunrui 05-292,Yunrui 19-001,and Yunrui 08-1609.The elite female parents included Yunzhe 05-51,Yunrui 13-38,Yunrui 10-456,Yunrui 14-199,and Yunrui 09-315.The combinations such as Yunrui 09-315×Yunzhe 05-51,Yunrui 14-199×Yunzhe 05-51,Yunzhe 05-51×Yuetang 91-976,Yunzhe 05-51×Yunrui 05-292,and Yunzhe 05-51×Yunrui 08-1609 exhibited outstanding performance in the nine traits,combining high yield and high sugar characteristics,making them ideal combinations for sugarcane breeding.This study identified a number of high-quality parents and superior combinations,which would provide a theoretical reference and germplasm foundation for sugarcane breeding for high yield and high sugar content.