Abstract: Twenty-nine japonica rice cultivars from Jiangsu and Zhejiang Provinces,China were used to investigate the variation and frequency distribution in grain phytic acid and protein contents in a field experiment in Hangzhou,and the correlations among grain phytic acid,total protein contents and four protein fractions were analyzed.Grain phytic acid content ranged from 0.699% to 1.034%,with a mean of 0.868%,in which Xiushui series of japonica rice cultivars generally exhibited lower phytic acid level than Wuyujing and Huai series;A roughly normal distribution,with a mean of 8.722%,was observed in total protein content of 29 japonica rice cultivars.Of four protein fractions,glutelin,globulin and albumin had larger coefficient of variation than prolamin,although their difference in prolamin content was cultivar type-dependent;No significant correlation was found between grain phytic acid and protein contents,while total protein content was significantly and positively related to glutelin content.

Key words: rice, phytic acid, protein, nutritional quality, relationship

摘要： 选用我国江浙地区近期育成的晚粳稻品种（系）29个，对它们在浙江杭州相同栽培条件下籽粒中的植酸、蛋白质含量与其组分差异及其相关性进行了分析。供试29个品种(系)植酸含量的平均值为0.868%，变化幅度为0.699%~1034%，其中秀水系列品种的植酸含量一般较低，而武育粳系列和淮字系列品种（系）的植酸含量则相对较高；供试29个品种材料总蛋白质含量的平均值为8.722%，其含量大致呈正态分布。在4种蛋白质组分中，谷蛋白、球蛋白和清蛋白在品种间的变异系数较大，而醇溶蛋白则相对较小，且在分布频率上也表现出品种类型间的差异特征；除谷蛋白与总蛋白质之间存在着极显著的正相关外，供试29个品种(系)的植酸含量与蛋白质含量及4种蛋白质组分含量间并无密切的关系。

关键词: 水稻, 植酸, 蛋白质, 营养品质