水稻籽粒有关性状与粒重关系的初步探讨

成熟期测定武育粳２号不同比重籽粒的有关性状，分析其与粒重的关系。结果表明：（１）不同比重谷粒及其糙米的长、宽度差异较小，厚度、体积差异较大，千粒重极差达６．４３ｇ；谷壳的面积和体积差异较小，谷壳重及单位面积谷壳重差异较大；（２）粒重为谷粒体积与比重的乘积，随着谷粒体积的增大，其比重明显提高（ｒ＝０．９２３４），粒重极显著地增加（ｒ＝０．９８８０）；（３）谷粒体积与糙米体积的大小关系密切（ｒ＝０．９

An Inquiring into Grain Characters and Their Relations with Grain Weight in Rice (Oryza sativa L.)

Japonica Cultivar Wuyujing 2 was employed for investigating characters of grain with different specific gravities at maturity. Results showed that: (1) Little differences between specific gravities were found in the length and width of paddy and hulled rice and large differences existed in the thickness and volume, the 1000-grain weight ranged as far as 6.43 g. (2) Grain weight was the product of the grain volume and specific gravity. The specific gravity and grain weight were increased significantly with the increment of grain volume, with correlation coefficients 0.9234 and 0.9880 , respectively. (3) The volume of hulled rice was closely related to that of paddy (r=0.9126). The length, width, thickness, volume and weight of hulled rice were increased with the increment of hull weight per unit area, and the hulled rice ratio also increased significantly.