糯高粱几个数量性状的配合力分析

ANALYSIS OF COMBINING ABILITY FOR QUANTITATIVE CHARACTERS IN GLUTINOUS SORGHUM

用泸72A 等4个糯不育系与 R_(35)等5个糯恢复系组成不完全双列杂交设计,估算了株高、穗粒重等7个性状的配合力。结果表明:各性状的配合力效应不同,同一性状不同亲本的一般配合力效应也各异。单株产量特殊配合力的高低取决于穗粒数和千粒重特殊配合力效应的协调。育种中在选择一般配合力高的亲本材料的基础上,应再对特殊配合力进行选择。穗柄长的加性和非加性效应同等重要,株高、穗长、一级分枝数、穗粒数和千粒重主要受加性基因效应控制,穗粒重以非加性基因效应为主。根据配合力总效应可以预测杂种优势。

A study of combining ability for 7 characters in 4 glutinous male sterile lines and 5 female restoring lines from a set of incomplete diallel crosses and their 20 F_1 hybrids indicated that the variance of GCA for characters was significant at 1%,and SCA effects for grain weight/ear- head was dependent on the harmony between that for number of grains/ earhead arid for 1000-grain weight.it is suggested that high GCA materials should be selected at first,and then high SCA ones in the breeding of hybrids Additive effects were as important as nonadditive effects in length of earhead stalk,but they played a more important role in plant height, earhead length,number of first branches,number of grains/earhead and 1000-grain weight.Nonadditive effects were more important in grain weight/ earhead.It is concluded that heterosis could be predicted by the total effects of combining ability(including GCA effects of parents and SCA effects of hybrids).