粳型光敏核不育系配制组合杂种优势分析

Analysis on Heterosis of F1 Hybrids from Japonica PGMS Lines in Rice

对用粳型光敏核不育系Ｎ５０８８Ｓ和７００１Ｓ与７５个不同类型的恢复系配制的１５０个两系杂交稻组合杂种优势进行分析结果表明，单株产量、单株有效穗、千粒重、穗总粒数等性状具有较强的超父优势和竞争优势，株高、穗长、生育期等性状表现负向超父优势和竞争优势。分析了杂种与父本之间各主要性状的相关关系，讨论了在选育两系杂交稻中应注意的一些问题。

The heterosis of 150 F1 hybrids between two japonica PGMS lines (N5088S and 7001S) and 75 restorers of various types was analyzed. The results showed that there existed an apparent positive overmale parent heterosis and standard heterosis in the characters of grain weight per plant, panicles per plant, 1 000grain weight and spikelets per panicle while in those of plant height, panicle length and growth duration there was a negative overmale parent heterosis and standard heterosis. The correlation of F1 hybrids to their corresponding male parents in major economic characters was analyzed, and some problems in breeding twoline hybrid rice were also discussed.