籼粳交重组自交系亚种属性判别及维管束性状的变异

以典型籼稻七山占和典型粳稻秋光构建的重组自交系群体为研究对象，利用程氏指数法和维管束分类性状分别对其不同世代（F6和F8）群体进行籼粳亚种属性判别。发现群体表现为中间类型占优势的偏粳分布，具有明显籼粳亚种间差异的维管束性状在群体内实现了重组，理论上通过籼粳杂交可以实现优良维管束性状的组合。穗颈大小维管束比、倒2节间和穗颈大维管束比在确认群体的籼粳属性时与程氏指数法判别结果相似，且较穗颈大、小维管束数和倒2节间大、小维管束数在世代间表现稳定，可作为鉴别群体籼粳属性的参考指标。群体内多数株系还属于分化不彻底的中间类型，造成穗颈大小维管束比、倒2节间和穗颈大维管束比对某些株系的判别存在一定差异。

Discrimination of indica and japonica Subspecies and Variations of Vascular Bundle Characteristics in Recombinant Inbred Lines Derived from an indica/japonica Cross

A recombinant inbred line(RIL)population derived from a cross between Qishanzhan(typical indica)and Akihikari(typical japonica)was used as materials.The result of subspecies discrimination in F6 and F8 generations based on the Cheng's index and vascular bundle characteristics showed that intermediate type lines were dominant and both populations were japonicalinous.The vascular bundle characteristics which were significantly different between indica and japonica were recombined in the RIL population.The discrimination results based on the ratio of large to small vascular bundles in panicle neck(RLSVB)and the ratio of large vascular bundles between the second internode from the top and panicle neck(RLVB)were consisted with those by the Cheng's index,so they could be regarded as the parameters for subspecies classification.Moreover,these parameters were more stable than the number of large or small vascular bundles in panicle neck or the second internode from the top among different generations.Because most lines in the populations were intermediate type without complete indica and japonica differentiation,the discrimination results in a certain line based on RLSVB and RLVB might be different.