Abstract: Effects of N,P and Zn treatments during rice developmental stage on grain phytic acid and its association with several mineral nutrients were studied in a hydroponic experiment with four rice cultivars,including indica cultivar Xieqingzao(XQZ)and its low phytic acid mutant(HIPi1),and japonica cultivar Xiushui 110 and its low phytic acid mutant(HIPj1).The results showed that higher N,P and Zn supply generally resulted in lower grain phytic acid content compared to lower N,P and Zn supply at rice developmental stage,although their sensitivities to P and Zn treatments were dependent on genotypes;N,P and Zn supply had a considerable influence on mineral nutrients accumulation in rice grains,with high N and P supply enhancing Fe concentration,but decreasing Cu accumulation in rice grains,respectively.Compared with low Zn supply,relatively lower grain Fe concentration,but more grain K,Mg accumulation could be found for high Zn treatment;Grain phytic acid was positively correlated with K,Mg,Fe and Cu concentrations in rice grains,but negatively with grain Zn concentration among different solution treatments,despite of their statistically significance varying with cultivars.These implied that the micro-nutritional quality could be synchronously improved by low phytic acid mutation,if an appropriate cultivation method was applied to enhance K,Mg,Fe and Zn concentrations in rice grains.

Key words: rice, phytic acid, nitrogen, phosphorus, zinc, mineral nutrition

摘要： 以协青早、秀水110及其辐射诱变获得的低植酸突变系（HIPi1和HIPj1）为材料，通过水培试验对不同氮、磷、锌浓度处理下水稻籽粒植酸含量差异及与几种矿质元素间的相关性进行了比较分析。高水平氮、磷、锌浓度处理的籽粒植酸含量较同一品种的低氮、磷、锌处理均有所降低，但在水稻生育期间，籽粒植酸含量对磷、锌处理浓度变化的敏感性，则因品种的植酸类型特征而异；氮、磷浓度增加能分别提高铁或降低铜在籽粒中的积累，但在高锌处理下，籽粒铁含量明显降低、而钾和镁的含量等却有所升高； 籽粒植酸含量一般与K、Mg、Fe、Cu 4种矿质元素含量呈正相关、与籽粒Zn含量呈负相关，但统计显著水平因品种而异。低植酸突变体籽粒中的K、Mg、Fe、Zn等含量虽略有下降，但可以通过适当的介质营养条件来调节有关矿质营养在水稻籽粒中的积累。

关键词: 水稻, 植酸, 氮, 磷, 锌, 矿质元素