粳型光敏核不育系主要农艺性状的配合力及杂种优势

Analysis of Combining Ability and F1 Heterosis of Photoperiod Sensitive Genic Malesterile Lines of Keng Rice

用４个不同来源的粳型光敏核不育系和８个恢复系组成４×８不完全双列杂交，分析了抽穗期、株高、穗长、每穗总粒数、单株有效穗数、每穗实粒数、结实率和千粒重等９个主要农艺性状的一般配合力和特殊配合力效应以及Ｆ１优势表现。结果表明，杂种性状主要受亲本一般配合力的作用，用亲本的一般配合力可预测杂种优势。一般配合力较强的不育系是９１－３２ｓ，恢复系是Ｃ８４２０、９０２２和９２０１６等，单株产量特殊配合力好的组合是９１－３２Ｓ／Ｃ８４２０和９１－３２Ｓ／９２０１６分别比生产上大面积应用冀梗８号增产５６．５７％和５１．８１％。

Four Photoperiodsensitive genic malesterile lines of Keng rice and 8 restoring lines were used to make a 4×8 incomplete diallel crosses. The heterosis and the combining ability of 9 main agronomic traits were analysed .The results were as follows: the characters of hybrid rice were main influenced by the GCA of parents. The heterosis could be predicted with GCA of its parents. The GCA of 9132s in four PGMSR was the hightest, while the restoring lines C8420,9022 and 92016 had high GCA values in the most traits. The best combination for grain weight per plant was 9132s/C8420 and 9132s/92016,yield of the two hybrids increased 56.57% and 51.81% comparing with “Jikeng 8” used in production.