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- W2336171021 abstract "Insufficient intake of zinc and iron from a cereal-based diet is one of the causes of ‘hidden hunger’ (micronutrient deficiency), which affects some two billion people1,2. Identifying a limiting factor in the molecular mechanism of zinc loading into seeds is an important step towards determining the genetic basis for variation of grain micronutrient content and developing breeding strategies to improve this trait3. Nutrients are translocated to developing seeds at a rate that is regulated by transport processes in source leaves, in the phloem vascular pathway, and at seed sinks. Nutrients are released from a symplasmic maternal seed domain into the seed apoplasm surrounding the endosperm and embryo by poorly understood membrane transport processes4–6. Plants are unique among eukaryotes in having specific P1B-ATPase pumps for the cellular export of zinc7. In Arabidopsis, we show that two zinc transporting P1B-ATPases actively export zinc from the mother plant to the filial tissues. Mutant plants that lack both zinc pumps accumulate zinc in the seed coat and consequently have vastly reduced amounts of zinc inside the seed. Blockage of zinc transport was observed at both high and low external zinc supplies. The phenotype was determined by the mother plant and is thus due to a lack of zinc pump activity in the seed coat and not in the filial tissues. The finding that P1B-ATPases are one of the limiting factors controlling the amount of zinc inside a seed is an important step towards combating nutritional zinc deficiency worldwide. Micronutrient deficiency in a cereal-based human diet can have grave consequences. Combining genetics, grafting and multi-elemental image analysis, the authors show how two maternal P1B-ATPases export zinc to the developing seed in Arabidopsis." @default.
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- W2336171021 date "2016-04-11" @default.
- W2336171021 modified "2023-10-15" @default.
- W2336171021 title "Mother-plant-mediated pumping of zinc into the developing seed" @default.
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- W2336171021 doi "https://doi.org/10.1038/nplants.2016.36" @default.
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