早籼恢复系明恢2155产量性状的配合力分析

Yield-trait-combining ability of early indica restorer lines,Minghui 2155

选用明恢2155等5个早熟恢复系与中九A等5个早熟三系不育系,采用5×5不完全双列杂交试验设计(NC-Ⅱ),研究了产量性状的配合力。结果表明,所有性状的一般配合力方差和特殊配合力方差均达显著或极显著水平;在小区产量、丛有效穗数、每穗总粒数、千粒重等性状上,基因加性效应起主导作用;除结实率和千粒重外,其他性状受恢复系的影响较大。在结实率方面,父母本互作效应也存在较大影响。明恢2155各产量性状上一般配合力效应值均表现最大;所有组合中,中九A×明恢2155在小区产量上的特殊配合力效应值最大。

Five early restorer lines, including Minghui 2155, and five early CMS-lines, including Zhong 9A, were ehosen for the study to understand their combining abilities on yield traits. A 5 ×5 incomplete diallele cross （NC- Ⅱ ） design was employed. The results showed that the variances of the general combining ability （GCA） and the specific combining ability （SCA） were both highly significant on all characteristics. The genetic additive effects were found on the plot yield, panicles per plant, spikelets per panicle and 1000 -grain weight （TGW）. The characteristics were affected greatly by restorer lines, except seed setting rate （SSR） and TGW. The interaction between parents also played a significant role in SSR. Minghui 2155 had the greatest GCA effects on all yield traits. Among the cross combinations, Zhong 9A× Minghui 2155 showed the greatest SCA effects on yield in the plot test.