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An intracellular transporter OsNRAMP7 is required for distribution and accumulation of iron into rice grains

文献类型： 外文期刊

作者： Li, Jingjun 1 ; Liu, Yuanyuan 1 ; Kong, Linghui 1 ; Xu, Ending 1 ; Zou, Yu 2 ; Zhang, Peijiang 2 ; Zhang, Wei 1 ; Chen, Xi 1 ;

作者机构： 1.Nanjing Agr Univ, Coll Life Sci, Dept Biochem & Mol Biol, Nanjing 210095, Jiangsu, Peoples R China

2.Anhui Acad Agr Sci, Rice Res Inst, Hefei 230031, Anhui, Peoples R China

关键词： Natural resistance -associated macrophage pro; tein; Rice; Grain; Golgi; Fe biofortification

期刊名称：PLANT SCIENCE （ 影响因子：5.2； 五年影响因子：5.7 ）

ISSN： 0168-9452

年卷期： 2023 年 336 卷

页码：

收录情况： SCI

摘要： Iron (Fe) is an essential micronutrient for plant growth and human health. Plants have evolved an efficient transport system for absorbing and redistributing Fe from the soil to other organs; however, the molecular mechanisms underlying Fe loading into grains are poorly understood. Our study shows that OsNRAMP7, a member of the natural resistance-associated macrophage protein (NRAMP) family, is a rice Fe transporter that localizes to the Golgi and trans-Golgi network (TGN). OsNRAMP7 was highly expressed in leaf blade, node I, pollen, and vascular tissues of almost tissues at the rice flowering stage. OsNRAMP7 knockdown by RNA interference (RNAi) increased Fe accumulation in the flag leaf blade, but decreased the Fe concentration in node I and rice grains. In addition, the knockdown of OsNRAMP7 also reduced grain fertility, pollen viability, and grain Fe concentration in the paddy fields; OsNRAMP7 overexpression significantly promoted Fe accumulation in the grains. Thus, our results suggest that OsNRAMP7 is required for the distribution and accumulation of Fe in rice grains and its overexpression could be a novel strategy for Fe biofortification in staple food crops.

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