摘要:
利用4个优质籼型水稻三系不育系和5个主推籼型强恢复系按4×5 NCII交配设计配组,对F1产量性状(有效穗数、每穗总粒数、结实率、千粒重)与米质性状(垩白粒率、整精米率、直链淀粉含量和胶稠度)的配合力及遗传率进行分析。结果表明:所有性状一般配合力差异达显著或极显著水平;除千粒重外,其余性状特殊配合力差异达极显著水平;一般配合力基因型方差占遗传总方差的比重显著大于特殊配合力占遗传总方差的比重;除胶稠度外,不育系对杂种各性状的形成起主导作用。遗传率估算结果,所有性状的遗传率均达60%以上,部份性状的遗传率高达90%以上,广义遗传率与狭义遗传率的表现基本一致。综合评价,不育系泸香618A、宜香1A,恢复系明恢1259、辐819和蜀恢527对优质高产三系杂交水稻新组合的选配具有重要的利用价值。
Abstract:
The combining ability and hereditary capacity of various yield and grain quality factors of the F1 hybrid rice were analyzed.The hybridization was based on p×q incomplete diallele cross(NCⅡ) design of 4 high quality sterile lines of Indica-type and 5 main popularized strong restorer lines of Indica-type(4×5).The results showed that(a) the general combining ability of all selected traits,except 1000-grain weight,showed highly significant differences;(b) the specific combining ability of all selected traits,except 1000-grain weight,had significant or highly significant differences;(c) the ratio of genotypic variance to the entire genotypic variance of the general combining ability was significantly higher than that of the specific combining ability;(d) other than gel consistency,the sterile lines play a dominant role in the traits of hybrid rice.The inheritability was estimated to be more than 70% for all traits and 90% for some.Either broad or narrow sense of the inheritability was basically same.Taking everything into account,the sterile lines,Luxiang 618A and Yixiang1A,and the restorer lines,Minghui 1259,Fu 819 and R527,were considered to be of value for breeding high quality,high yield,three-line hybrid rice.
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