籼粳杂种多倍体结实情况的初步研究

Analysis of seed settings of polyploid of indica-japonica hybrids in rice

用 1 0个籼粳交组合的二倍体和四倍体为试材 ,研究了加倍对每穗总粒数、每穗实粒数和结实率的影响 .结果表明 :加倍对结实率等性状的影响因组合不同而不同 .四倍体籼粳杂种的结实率显著高于二倍体 .加倍对正反交的结实情况也有影响 .要提高籼粳交多倍体的结实率 ,应注重同时增加总粒数和实粒数 .

Comparative studies were conducted for three seed setting characters(grain number per panicle,filled grain number per panicle and filled grain percentage)between tetraploid and diploid of ten indica-japonica hybrids in rice.The results indicated that the effects of polyploidy on the three characters varied among different hybrids.Significant increases in filled grain percentage were observed in the tetraploid hybrids.Reciprocal crosses showed differences in the three traits.It is suggested that the grain number per panicle and filled grain number per panicle should be increased to enhance the seed settings of indica-japonica polyploids.