水稻籼粳型品系主要农艺性状的配合力分析

Combining Ability Analysis of Major Agronomic Characters of Indica-Japonica Lines in Rice

分析了3个籼粳型品系与籼型光温敏不育系杂交9个农艺性状在早、晚季环境下的配合力效应.结果表明:G2417 1的单株有效穗数、穗长、结实率和单株产量,G3005 4 1的抽穗日数、穗总粒数、穗实粒数和单株产量以及G2123的千粒重(质量)等性状的一般配合力效应在早、晚两季环境下均表现较好;总体上,一般配合力效应以G2417 1表现较好,G3005 4 1次之,而特殊配合力效应以G3005 4 1表现较好,G2123次之;海3S/G3005 4 1和培矮64S/G3005 4 1等组合的单株产量特殊配合力在早、晚季环境下均表现较好;3个籼粳型品系与籼稻具有较大的遗传距离,从9个农艺性状的配合力效应看,G2417 1和G3005 4 1在两系杂交稻育种中的应用价值较大.

The combining ability of 9 major agronomic characters was analyzed by crossing indicajaponica lines(IJLs) with indica photothermosensitive genetic male sterile lines in early and late season conditions. The results indicated that: The general combining ability (GCA) of plant height, panicles/plant, panicle length, seed setting rate, grain weight/plant in G24171, and the GCA of days to heading, spikelets/panicle, filled spikelets/panicle, grain weight/plant in G300541 and the GCA of 1000grain weight in G2123 were better both in early and late season. On the whole, G24171 had better GCA, and G300541 was the next, while G300541 had better specific combining ability (SCA) and G2123 was the next. Crosses Hai3S/G300541 and Peiai64S/G300541 could obtain high and stable SCA of grain weight/plant in early and late season. Three IJLs had large genetic distance to indica, and G24171 and G300541 had better exploited value in twoline system hybrid rice breeding according to the combining ability of 9 major agronomic characters. 