Abstract: Field experiment was conducted with three rice genotypes differed in the tolerance to low potassium stress. The results showed that low potassium stress led to decreasing in the content of potassium and crude protein in milled rice grains. The content of potassium in hull was higher than that in milled rice grain; and was correlated significantly with that of crude protein in milled rice grains. The relative potassium content in milled rice or hull and crude protein content in milled rice was higher for the efficient genotype than that for the inefficient genotype.

Key words: rice, potassium, crude protein, genotype

摘要： 采用对低钾胁迫敏感程度不同的3种水稻基因型进行田间试验， 以研究水稻籽粒中钾和蛋白质含量。结果表明，低钾胁迫降低水稻籽粒中钾含量和粗蛋白含量，谷壳中钾含量高于米粒中钾含量，米粒中钾含量与粗蛋白含量呈显著正相关。钾高效基因型在低钾胁迫下谷壳和米粒中具有较高的钾相对含量，其米粒中的粗蛋白相对含量也较高。

关键词: 水稻, 钾, 粗蛋白, 基因型