Improving Zinc and Iron Accumulation in Maize Grains Using the Zinc and Iron Transporter ZmZIP5

文献类型： 外文期刊

第一作者： Li, Suzhen

作者： Li, Suzhen;Liu, Xiaoqing;Zhou, Xiaojin;Li, Ye;Yang, Wenzhu;Chen, Rumei

作者机构：

关键词： Endosperm; Iron; Iron-regulated transporter-like protein (ZIP); Maize; Overexpression; RNAi; Zinc; Zinc-regulated transporters

期刊名称：PLANT AND CELL PHYSIOLOGY （ 影响因子：4.927； 五年影响因子：5.516 ）

ISSN： 0032-0781

年卷期： 2019 年 60 卷 9 期

页码：

收录情况： SCI

摘要： Zinc (Zn) and iron (Fe) are essential micronutrients for plant growth. Thus, it is important to understand the mechanisms of uptake, transport and accumulation of these micronutrients in maize to improve crop nutritional quality. Members of the zinc-regulated transporters, iron-regulated transporter-like protein (ZIP) family are responsible for the uptake and transport of divalent metal ions in plant. Previously, we showed that ZmZIP5 functionally complemented the Zn uptake double mutant zrt1zrt2, Fe-uptake double mutant fet3fet4 in yeast. In our beta-glucuronidase (GUS) assay, the germinated seeds, young sheaths, and stems of ZmZIP5-promoter-GUS transgenic plants were stained. We generated and compared two maize lines for this study: Ubi-ZmZIP5, in which ZmZIP5 was constitutively overexpressed, and ZmZIP5i, a RNAi line. At the seedling stage, high levels of Zn and Fe were found in the roots and shoots of Ubi-ZmZIP5 plants, whereas low levels were found in the ZmZIP5i plants. Zn and Fe contents decreased in the seeds of Ubi-ZmZIP5 plants and remained unchanged in the seeds of ZmZIP5i plants. The seeds of Leg-ZmZIP5 plants, in which ZmZIP5 overexpression is specific to the endosperm, had higher levels of Zn and Fe. Our results imply that ZmZIP5 may play a role in Zn and Fe uptake and root-to-shoot translocation. Endosperm-specific ZmZIP5 overexpression could be useful for Zn and Fe biofortification of cereal grains.

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