对 50份日本粳稻品种 (系 )分别以糙米、精米的粒体和粉体四种形态为试验材料 ,作了直链淀粉含量分析 .结果表明 :平均直链淀粉含量分别为糙米粒体 1 8.4% ,精米粒体 1 8.8% ,糙米粉体 1 7.9% ,精米粉体 1 8.1 % ;相同形态试料的测定值非常接近 ,在水稻育种实践中可用糙米粒体代替精米粉体作直链淀粉含量的测定分析 ,提高工作效率 . The amylose content of 50 japonica japonica cultivars (lines) were tested with four kinds of brown rice and polished rice as the experimental materials.The results showed that the average amylose contents were brown rice grain 1 8.4 %, Refined rice grain 1 8.8%, brown rice powder 1 7.9%, polished rice 1 8.1%; the same shape of the sample measured values ​​are very close, in rice breeding practice can be used instead of polished rice grain amylose powder Determination of the content analysis, improve work efficiency.