Application Research on Several New Parents Gui Sugar 00/122 and Yue Sugar 91/976 etc. and Their Combinations

[Objective] The study was to provide the theoretical basis for improving yield and quality of sugarcane varieties.[Methods] 8 combinations such as Gui Sugar 92/66×ROC22(X1),ROC22×Gui Sugar 92/66(X2),Gui Sugar 00/122×K86/110(X3),Yue sugar 91/976×CP94/1100(X4),Yue sugar 91/976×Gui Sugar 00/122(X5),Yue sugar 91/976×HOCP95/988(X6),Chuan Sugar 89/103×CP93/163(X7),Yue 83/257×CP57/614+Ya 84/153(X8) were taken as the materials.The performance of their main agronomic characteristics in F1 generation was studied.[Results] The F1 generation of X7 had higher yield with higher sugar content and it was a good combination.The F1 generation of X5 had good yield characters with lower sugar content.The parents in those 2 combinations had bigger genetic effect in good characteristics with good comprehensive properties,so they could be emphatically used to prepare combinations according to breeding objectives.The parents in combinations of X1,X2,X3 and X4 had smaller genetic effect in good characteristics with simple comprehensive properties,so they could be properly used to prepare combinations.While the parents in combinations of X6 and X8 had smaller genetic effect in good characteristics with worse comprehensive properties,so they could not be used to prepare combinations.[Conclusion] The study identified the applied value of several new sugarcane parents in breeding of new varieties.