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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >The tomato fer gene encoding a bHLH protein controls iron-uptake responses in roots
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The tomato fer gene encoding a bHLH protein controls iron-uptake responses in roots

机译：编码bHLH蛋白的番茄fer基因控制根中的铁吸收响应

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摘要

Iron deficiency is among the most common nutritional disorders in plants. To cope with low iron supply, plants with the exception of the Gramineae increase the solubility and uptake of iron by inducing physiological and developmental alterations including iron reduction, soil acidification, Fe(ll) transport and root-hair proliferation (strategy I). The chlorotic tomato fer mutant fails to activate the strategy I. It was shown previously that the fer gene is required in the root. Here, we show that fer plants exhibit root developmental phenotypes after low and sufficient iron nutrition indicating that FER acts irrespective of iron supply. Mutant fer roots displayed lower Leirt1 expression than wild-type roots. We isolated the fer gene by map-based cloning and demonstrate that it encodes a protein containing a basic helix-loop-helix domain, fer is expressed in a cell-specific pattern at the root tip independently from iron supply. Our results suggest that FER may control root physiology and development at a transcriptional level in response to iron supply and thus may be the first identified regulator for iron nutrition in plants.
机译：缺铁是植物中最常见的营养失调之一。为了应付铁的低供应，除禾本科以外的植物通过诱导生理和发育变化，包括铁减少，土壤酸化，Fe（II）转运和根毛增生，来增加铁的溶解度和摄取（策略I）。褪绿番茄fer突变体未能激活策略I。先前已证明，fer基因在根中是必需的。在这里，我们表明，在铁营养不足的情况下，高铁植物表现出根系发育表型，表明铁的作用与铁的供应无关。突变的fer根显示出比野生型根更低的Leirt1表达。我们通过基于图的克隆分离了fer基因，并证明其编码包含基本螺旋-环-螺旋结构域的蛋白质，fer在根尖独立于铁供应以细胞特异性模式表达。我们的结果表明，FER可能响应铁的供应而在转录水平上控制根部生理和发育，因此可能是植物中铁营养的第一个被鉴定的调节剂。

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