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首页> 外文期刊>Journal of Experimental Botany >Phytosiderophores determine thresholds for iron and zinc accumulation in biofortified rice endosperm while inhibiting the accumulation of cadmium
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Phytosiderophores determine thresholds for iron and zinc accumulation in biofortified rice endosperm while inhibiting the accumulation of cadmium

机译：植物细胞测定生物化水稻胚乳中铁和锌积聚的阈值，同时抑制镉的积累

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摘要

Nicotianamine (NA) and 2'-deoxymugenic acid (DMA) are metal-chelating ligands that promote the accumulation of metals in rice endosperm, but it is unclear how these phytosiderophores regulate the levels of different metals and limit their accumulation. In this study, transgenic rice plants producing high levels of NA and DMA accumulated up to 4-fold more iron (Fe) and 2-fold more zinc (Zn) in the endosperm compared with wild-type plants. The distribution of Fe and Zn in vegetative tissues suggested that both metals are sequestered as a buffering mechanism to avoid overloading the seeds. The buffering mechanism involves the modulation of genes encoding metal transporters in the roots and aboveground vegetative tissues. As well as accumulating more Fe and Zn, the endosperm of the transgenic plants accumulated less cadmium (Cd), suggesting that higher levels of Fe and Zn competitively inhibit Cd accumulation. Our data show that although there is a strict upper limit for Fe (similar to 2.5 mu g g(-1) dry weight) and Zn (similar to 84 mu g g(-1) dry weight) accumulation in the endosperm, the careful selection of strategies to increase endosperm loading with essential minerals can also limit the accumulation of toxic metals such as Cd, thus further increasing the nutritional value of rice.
机译：尼古拉胺（Na）和2'-脱氧约酸（DMA）是金属螯合配体，可促进水稻胚乳中金属的积累，但目前尚不清楚这些植物细胞如何调节不同金属的水平并限制其积累。在该研究中，与野生型植物相比，在野生型植物相比，产生高水平的NA和DMA的转基因水稻和DMA的铁（Fe）和2倍以下的锌（Zn）。营养组织中Fe和Zn的分布表明，两种金属被隔离为缓冲机制，以避免过载种子。缓冲机制涉及调节编码根部和地上营养组织中金属转运蛋白的基因。除了积累更多的Fe和Zn，转基因植物的胚乳累积较少的镉（CD），表明较高水平的Fe和Zn竞争性抑制CD积累。我们的数据表明，虽然Fe的严格上限（类似于2.5 mu Gg（-1）干重）和Zn（类似于84 mu gg（-1）干重）积聚在胚乳中，细致的选择用必要矿物质增加胚乳荷载的策略也可以限制CD等毒性金属的积累，从而进一步提高了水稻的营养价值。

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