Abstract:

Grains of 47 main varieties in the middle and lower reaches of Yangtze River were used as materials in this research, the statistics of each grain character were output by the automatic seed test analysis and 1 000 grain weight instrument. The results showed that, the correlation between length-width ratio and roundness is greatest among grain characters, the correlation index is -0.98. According to the roundness, grains of rice could be divided into 3 types, the circular type’s roundness is more than 0.303, the oval type’s is between 0.248 and 0.303, the long type’s is less than 0.248.

Key words: rice, varieties, grain characters, roundness

摘要：

利用长江中下游大面积应用的47个籼稻品种籽粒为材料，通过自动考种及千粒重测定，分析了水稻籽粒各性状。结果表明，水稻籽粒各性状中，长宽比与圆度的相关性最大，相关系数达-0.98。提出可以将圆度作为水稻籽粒分类指标，圆度＞0.303时为偏圆型，0.248＜ 圆度≤0.303时为中粒型，圆度≤0.248时为长粒型。

关键词: 水稻, 品种, 籽粒性状, 圆度