Abstract: Thirty-three hybrid rice combinations were used to study the relationship between ratio of grain to leaf area and ratooning ability from 1995 to 1998. There were significant negative correlationship between the ratio of grain to leaf area and the ratooning ability of main crop. The ratooning ability of varieties can be changed under the ratio of grain to leaf area were regulated. The reason was that there are significant positive correlationship between dry weight of mother’s stem and the ratooning ability, significant negative correlationship between the ratio of grain to leaf area and dry weight of mother’s stem. Significant positive correlationship between the number of grains per panicle among varieties and the ratio of grain to leaf area of main crop were observed, there were significant negative correlationship between the number of grains per panicle of main crop and the yield of the ratooning rice. The number of grains per panicle of main crop could be used as a distinguishing criterion for the ratooning ability.

Key words: hybrid rice, ratooning rice, ratio of grain to leaf area, ratooning ability, relationship

摘要： 以33个杂交中稻组合为材料，研究了粒叶比与再生力的关系。结果表明：头季稻品种间粒叶比与再生力呈显著或极显著负相关，在粒叶比的调节下，品种间再生力的强弱可以相互转化；其原因在于，母茎鞘干物重与再生力呈极显著正相关，而粒叶比与母茎鞘干物重则呈极显著负相关关系，即头季稻粒叶比小，单位颖花绿叶面积占有量大，可减少母茎鞘中先期贮藏的光合产物向穗部的输入量，使头季稻收割时母茎鞘有较多剩余光合产物，为再生芽生长提供重要的营养物质；杂交中稻组合间着粒数与粒叶比呈极显著正相关，组合间着粒数与再生稻产量呈极显著负相关，可将头季稻品种着粒数作为判别再生力的重要指标之一。

关键词: 杂交水稻, 再生稻, 粒叶比, 再生力, 相关关系