大穗型杂交晚稻不同季别结实性研究

Studies on Seed-setting Rate of Large-panicle Late hybrid Rice in Different seasons

分析大穗型杂交晚稻不同季别结实性变化 ,发现部分组合结实率季间变化差异显著 ,不同组合季间结实率变幅为- 1.1%～ 2 5 .1%。对结实率变幅大的组合的结实性构成分析结果表明 ,在适宜的生态条件下 ,有的大穗型杂交稻穗基部受精颖花发育成饱满籽粒的比例能显著提高 ,颖花受精率也获得较大提高。通过异季结实性观察 ,有助于提高大穗型杂交稻结实性选择的效果 ,并充分发挥大穗型杂交稻生产利用潜力。

This paper analyses the variation of seed-setting rate in large-panicle late hybrid rice in different seasons. The variation scope of seed-setting rate in hybrid combination is between -1.1% ~ 25.1% in different seasons. There is large variation scope of seed-setting rate for hybrid combinations, when ecological conditions is favorable not only the opportunities for the spike lets to accept sperm but also the opportunities for the spike lets which have accepted sperm to grow plump have increased.