Fukushima Ayaka, Perera Ishara, Hosoya Koki, Akabane Tatsuki, Hirotsu Naoki
Graduate School of Life Sciences, Toyo University, 1-1-1 Izumino, Itakura-machi, Oura-gun, Gunma 374-0193, Japan.
Grain Legumes and Oil Crops Research and Development Centre, Department of Agriculture, Angunakolapelessa 82220, Sri Lanka.
Plants (Basel). 2020 Jan 23;9(2):146. doi: 10.3390/plants9020146.
Phytic acid (PA) prevents the absorption of minerals in the human intestine, and it is regarded as an antinutrient. Low PA rice is beneficial because of its higher Zn bioavailability and it is suggested that the gene expression level of -inositol 3-phosphate synthase 1 () in developing grain is a key factor to explain the genotypic difference in PA accumulation among natural variants of rice. P fertilization is also considered to affect the PA content, but it is not clear how it affects gene expression and the PA content in different genotypes. Here, we investigated the effect of P fertilization on the PA content in two contrasting rice genotypes, with low and high PA accumulation, respectively. Based on the results of the analysis of the PA content, inorganic P content, gene expression, and xylem sap inorganic P content, we concluded that the effect of P fertilization on PA accumulation in grain differed with the genotype, and it was regulated by multiple mechanisms.
植酸（PA）会阻碍人体肠道对矿物质的吸收，被视为一种抗营养物质。低植酸水稻有益，因为其锌生物有效性更高，并且有研究表明，发育籽粒中肌醇-3-磷酸合酶1（）的基因表达水平是解释水稻自然变异体间植酸积累基因型差异的关键因素。磷肥施用也被认为会影响植酸含量，但尚不清楚其如何影响不同基因型的基因表达和植酸含量。在此，我们研究了磷肥施用对两种分别具有低植酸积累和高植酸积累的对比水稻基因型中植酸含量的影响。基于植酸含量、无机磷含量、基因表达以及木质部汁液无机磷含量的分析结果，我们得出结论：磷肥施用对籽粒中植酸积累的影响因基因型而异，且受多种机制调控。
