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采用程氏指数法研究的结果表明 :95个籼粳杂交育成水稻品种均划入粳型或偏粳型 ;6项亚种特征性状中穗壳色、酚反应、稃毛、叶毛及籽粒长宽比全部或大多表现典型粳型特性 ,少量为中间型或偏向籼型 ,穗节长表现中间类型最多 ,极少数为籼型和粳型 ;籼粳杂交F1 和育成品种的程氏指数和亚种特征性状与经济性状关系不密切 ,而F2 的相关性明显增大 ;大小维管束比和大维管束比是籼粳亚种分类的参考指标
The results of Cheng’s index method showed that 95 varieties of indica-japonica hybrid rice were classified as japonica or japonica; the characteristics of panicle color, phenol reaction, beard hair, leaf hair and grain length The ratio of breadth to breadth showed typical japonica characteristics, with a small amount of intermediate or partial indica type, the middle part of spike length was the most, and the few were indica and japonica. The Cheng’s index and sub-varieties of indica-japonica hybrid F1 and bred varieties The traits of traits and economic traits were not closely related, but the correlation of F2 was significantly increased. The ratio of large and small vascular bundles to large vascular bundles was the reference index for indica-japonica subspecies classification