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OPT3 Is a Phloem-Specific Iron Transporter That Is Essential for Systemic Iron Signaling and Redistribution of Iron and Cadmium in Arabidopsis

机译:OPT3是特定于韧皮部的铁转运蛋白对于拟南芥中的系统铁信号传递和铁和镉的重新分配至关重要。

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摘要

Iron is essential for both plant growth and human health and nutrition. Knowledge of the signaling mechanisms that communicate iron demand from shoots to roots to regulate iron uptake as well as the transport systems mediating iron partitioning into edible plant tissues is critical for the development of crop biofortification strategies. Here, we report that OPT3, previously classified as an oligopeptide transporter, is a plasma membrane transporter capable of transporting transition ions in vitro. Studies in Arabidopsis thaliana show that OPT3 loads iron into the phloem, facilitates iron recirculation from the xylem to the phloem, and regulates both shoot-to-root iron signaling and iron redistribution from mature to developing tissues. We also uncovered an aspect of crosstalk between iron homeostasis and cadmium partitioning that is mediated by OPT3. Together, these discoveries provide promising avenues for targeted strategies directed at increasing iron while decreasing cadmium density in the edible portions of crops and improving agricultural productivity in iron deficient soils.
机译:铁对于植物生长以及人类健康和营养都是必不可少的。了解将铁需求从新芽传递到根部以调节铁吸收的信号传导机制以及介导铁分配进入可食植物组织的运输系统,这对于作物生物强化策略的发展至关重要。在这里,我们报告说,OPT3,以前被归类为寡肽转运蛋白,是一种能够在体外转运过渡离子的质膜转运蛋白。在拟南芥中的研究表明,OPT3将铁装载到韧皮部中,促进铁从木质部到韧皮部的再循环,并调节茎到根的铁信号传导和铁从成熟组织向发育组织的重新分布。我们还发现了由OPT3介导的铁稳态与镉分配之间串扰的一个方面。总之,这些发现为有针对性的战略提供了有希望的途径,这些战略旨在提高铁含量,同时降低作物可食部分的镉密度,并提高缺铁土壤的农业生产率。

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