培矮64S/爪哇稻F1农艺性状表现和对照优势分析

本文报道了利用原始爪哇稻资源与光温敏雄性不育系培矮64S配制的27个籼爪交组合在长沙的农艺性状和杂种优势表现.从总体上来看,籼爪交组合与对照相比在每穗实粒数和理论产量上无显著差异,在其它性状上均有极显著的差异;籼爪交组合在秆高、穗长、每穗总粒数、每穗实粒数和千粒重方面有正向对照优势,在播始历期、有效分蘖数、结实率、理论产量和实际产量上存在负向对照优势.从个体上来看,籼爪交组合理论产量对照优势＞40%的比例为11.1%.实际产量对照优势＞40%的机率为3.7%,说明爪哇稻资源在籼爪交杂种优势利用中具有利用价值.本文还对爪哇稻资源在籼爪杂种优势利用中的一些问题进行了讨论.

Analysis of agronomic traits and standard heterosis of F1 hybrid between Pei'ai 64S and Javanica rice

This paper reports the agronomic traits and standard heterosis(SH) of 27 indica/javanica hybrids Pei'ai 64S(Indica rice,a thermo-sensitive genic male sterile line) and Javanica rice at Changsha.In general,there are no significant difference in grains per panicle and theoretic yield per hectare but significant difference at 1% level in the other traits between indica/javanica hybrid and check;comparing with the check,the indica/ javanica hybrids have positive SH in culm height,panicle length,spikelets per panicle, grains per panicle and 1000-grain weight;and negtive SH in days to flower,effective tillers per plant,seed set,theoretic yield per hectare,actual yield per hectare.For the individuals,the hybrids with SH of theoretic yield per hectare>40% possess 11.1%,the hybrids with SH of actual yield per hectare >40% occupy 3.7%.The utilization method of iavanica resouces is discussed.