水稻穗颈及第2节间维管束数的遗传分析

以沈农89366等4个亲本进行完全双列杂交，对水稻穗颈和第2节间大、小维管束数采用加性－显性模型进行遗传分析。结果表明：维管束性状的遗传以加性效应为主，狭窄义遗传力介于0．4151－0．5519之间。显性效应值达到显著水平的杂交组合和性状不多，杂种优势较弱。穗颈大维管束数与1次枝梗数、2次枝梗数、2次枝梗颖花数、结实率、穗颈小维管束数与1次枝梗数、第2节间小维管束数与2次枝梗数及2次枝梗颖花数之间具有显著或极显著的加性相关，可作为间接选择的参考指标。

Genetic Analysis of Vascular Bundle Numbers in Panicle Base and the Second Internode in Oryza sativa L.

A complete diallel crossing of four rice parents was done. The large and small vascular bundle numbers in panicle base and the second internode in the F 1 and their parents were analyzed by using additive-dominance model. The results showed that the inheritance of vascular bundle character was mainly predominant by additive effect and the narrow heritability ( h 2 N) was between 0 415 1 and 0 551 9. The cross combinations with significant dominant effects were few and the heterosis of vascular bundle numbers was weak. There were some additive correlations with significant or very significant among the large vascular bundle numbers in panicle base, the primary rachis branch numbers, the secondary rachis branch numbers and their spikelets, and the seed setting rate. These relationships also existed for the small vascular bundle numbers in panicle base with the primary rachis branch numbers, and the small vascular bundle numbers in the second internode with the secondary rachis branch numbers and their spikelets. These relationships could be used as a reference index in breeding.