Key Laboratory of Ministry of Education for Genetics, Breeding and Multiple Utilization of Crops; Fujian Provincial Key Laboratory of Agroecological Processing and Safety Monitoring, College of Crop Science, Fujian Agriculture and Forestry University , Fuzhou 350002, P. R. China.
Institute of Crop Science, College of Agriculture and Biotechnology, Zhejiang University , Hangzhou 310058, P. R. China.
J Agric Food Chem. 2018 Feb 21;66(7):1601-1611. doi: 10.1021/acs.jafc.7b04883. Epub 2018 Feb 9.
Development of rice cultivars with low phytic acid (lpa) is considered as a primary strategy for biofortification of zinc (Zn) and iron (Fe). Here, two rice genotypes (XS110 and its lpa mutant) were used to investigate the effect of P supplies on accumulations and distributions of PA, Zn, and Fe in rice grains by using hydroponics and detached panicle culture system. Results showed that higher P level increased grain PA concentration on dry matter basis (g/kg), but it markedly decreased PA accumulation on per grain basis (mg/grain). Meanwhile, more P supply reduced the amounts and bioavailabilities of Zn and Fe both in milled grains and in brown grains. Comparatively, lpa mutant was more susceptive to exogenous P supply than its wild type. Hence, the appropriate P fertilizer application should be highlighted in order to increase grain microelement (Zn and Fe) contents and improve nutritional quality in rice grains.
培育低植酸（lpa）水稻品种被认为是生物强化锌（Zn）和铁（Fe）的主要策略。在这里，使用水培和离体穗培养系统，利用两个水稻基因型（XS110 和其 lpa 突变体）来研究磷供应对水稻籽粒中植酸（PA）、锌和铁积累和分布的影响。结果表明，较高的磷水平增加了干物质基础上的籽粒 PA 浓度（g/kg），但显著降低了每粒籽粒上的 PA 积累量（mg/grain）。同时，更多的磷供应减少了碾磨谷物和糙米中锌和铁的含量和生物可利用率。相比之下，lpa 突变体比其野生型更易受外源磷供应的影响。因此，为了增加谷物微量元素（Zn 和 Fe）含量并改善谷物的营养价值，应强调适当施用磷肥。
