籼型杂交晚稻新组合穗部性状与稻曲病抗性相关性研究

为了解长江中下游稻区新育成杂交晚籼新组合对稻曲病的抗性，及其穗部性状与稻曲病抗性的相关性，通过人工接种研究了205个来自国家长江中下游、湖南省和湖北省水稻区域试验杂交晚籼新组合穗部主要性状与稻曲病抗性相关性。结果表明，长江中下游稻区新育成的杂交晚籼组合稻曲病抗性差异显著，多数组合稻曲病抗性较弱，中感以上组合占75.12%。籼型杂交晚稻穗部主要性状与稻曲病抗性关系密切，抗病组合每穗总粒数少，每穗总枝梗数少，着粒密度较稀，感病组合则相反，抗、感组合间穗部主要性状差异极显著。每穗总粒数、总枝梗数和着粒密度与稻曲病抗性极显著相关，相关性大小依次为每穗总粒数>穗总枝梗数>着粒密度。抗、感病组合间的稻穗长度差异不显著，稻穗长度与稻曲病抗性无显著相关性，稻曲病病穗率与病情指数极显著相关。

Study on the Relationship Between Characters of Panicle and False Smut Resistance of Hhybrid Late Indica Rice New Combinations

Panicle main characters and false smut resistance of 205 new hybrid late indica rice combinations from the State of the Yangtze River,Hunan and Hubei rice regional trials were studied by artificial inoculation.The results showed that there was significant difference between the new hybrid late indica rice combinations with false smut resistance of Yangtze River middle and lower reaches,resistance of majority combinationswas weaker,above middle susceptible accounted for 75.12%.Hybrid late indica rice panicle...