Abstract: Seed potassium contents in 6 wild rice, 53 japonica rice, 153 indica rice and 28 indica hybrid rice from 25 countries and areas were determined in flame photometry. The average seed potassium contents of the four kinds of rice were arranged in such order: indica hybrid combinations, japonica＞indica＞wild rice. The both extremes of　the seed potassium contents in japonica, indica, wild rice and indica hybrid genotypes were 0. 4774 % and 0.2 175%,0.4495 % and 0.2165 % , 0. 2508 % and 0. 1381 %, and 0. 3763 % and 0. 3018 %, respectively. The genotypic differences were high significant. The frequency distribution of the seed K contents in the 234 cultivated genotypes resembled normal distribution.

Key words: genetic diversity, hybrid combinations, indica, japonica, seed potassium contents, wild rice

摘要： 对6份野生稻，53份粳稻，153份籼稻和28份杂交稻F₁代种子的钾含量进行了分析。水稻种子含钾量的差异十分显著，尤其是籼稻和粳稻种子有着成倍的差别。

关键词: 野生稻, 粳稻, 籼稻, 籼型杂交稻, 种子含钾量, 遗传多样性