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How do plants respond to copper deficiency?

机译:植物如何应对铜缺乏症?

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摘要

The transition metal copper is essential for all organisms yet excess copper is toxic because of production of free radicals via its free form. Therefore, the levels of copper are precisely regulated in a cell. Under copper depleted conditions, the expression of Cu/Zn superoxide dismutase (SOD) is downregulated and its function is compensated by Fe SOD in chloroplasts of higher plants. We presented evidence that a microRNA, miR398, is involved in this downregulation of Cu/Zn SOD genes in Arabidopsis thaliana when grown at low copper levels, corresponding to less than 1 µM Cu in tissue culture media. However, a green alga, Chlamydomonas reinhardtii, adjusts to copper depletion by modifying the photosynthetic apparatus from copper containing plastocyanin to iron containing cytochrome c6. During evolution plants modified one of the main strategies to respond to copper deficiency probably to adapt to different metal environments.
机译:过渡金属铜对于所有生物都是必不可少的,但是过量的铜是有毒的,因为通过其游离形式产生自由基。因此,可精确调节电池中的铜含量。在缺铜条件下,高等植物叶绿体中Cu / Zn超氧化物歧化酶(SOD)的表达下调,其功能被Fe SOD所补偿。我们提供的证据表明,当在低铜水平下生长时,拟南芥中的Cu / Zn SOD基因下调参与了microRNA miR398的调控,这相当于组织培养基中的Cu含量低于1 µM。但是,绿藻莱茵衣藻可通过将光合作用装置从含铜质蓝蛋白改变为含铁细胞色素c6来调节铜的消耗。在进化过程中,植物修改了应对铜缺乏的主要策略之一,以适应不同的金属环境。

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