关键词: 水稻, 谷粒密度, 糙米, 粒型性状, 相关性

Abstract:

The grain density and grain type characters of grain and brown rice of 161 rice varieties were measured. The results showed that, the grain density was exeremely significant positively correlated with 1 000-grain weight and grain length, significant positively correlated with length-width ratio and 100-grain volume; the density of brown rice was extremely significant positively correlated with 1 000-kernel weight, kernel length, 100-kernel volume and kernel thickness, and significant positively correlated with kernel width. The path analysis showed that, both grain and brown grain’s 1 000-grain weight had the most direct positive effect on grain density, while 100-kernel volume and kernel width had the most direct negative effect on grain density. Most other characters of grain affect grain  density indirectly through 1 000 grain weight and 100-grain volume, while the indirect effect of brown grain density was more complex. The grain regression model indicated that it was necessary to increase the predictive variables to get better prediction result; the brown rice regression model showed that the 1 000-grain weight, grain thickness and 100-grain volume could explain 70.2% of dependent variable.

Key words: rice, grain density, brown rice, grain type characters, correlation