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首页> 外文会议>International Plant Nutrition Colloquium; 2005; Beijing >Transcriptional regulation of the iron-phytosiderophore transporter ZmYS1 in dependency of iron supply and heavy metal excess in maize
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Transcriptional regulation of the iron-phytosiderophore transporter ZmYS1 in dependency of iron supply and heavy metal excess in maize

机译：铁-植物铁载体ZmYS1的转录调控与玉米铁供应和重金属过量的关系

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Among higher plants graminaceous species have the unique ability to efficiently acquire iron (Fe) from alkaline soils by secreting phytosiderophores (PS). Iron(Ⅲ)-phytosiderophores are subsequently taken up by roots via YS1 transporters. Previous investigations on substrate specificity with electrophysiological analyses in oocytes revealed that Zea mays YS1 mediated transport of various phytosiderophore-bound metals, including Zn, Cu, Ni and, at a lower rate, also Mb and Cd. ZmYS1 also transported Ni(Ⅱ)-, Fe(Ⅱ)- and Fe(Ⅲ)-complexes with nicotianamine (NA), a structural analog of phytosiderophores, which is believed to act as an intracellular metal chelator in all higher plants. These results showed that ZmYS1 encodes a broad-range metal-phytosiderophore transporter that additionally transports Fe- and Ni-nicotianamine, indicating a novel role of YS1 transporters in heavy metal homeostasis in plants (Schaaf et al., 2004a). To further investigate a role of the phytosiderophore system in heavy metal uptake, the transcriptional regulation of ZmYS1 in roots and shoots was investigated in dependency of heavy metal excess in the nutrient solution. Our results show that ZmYS1 is not up-regulated in response to elevated concentrations of heavy metals, but in response to iron deficiency, emphasizing a more specific role in Fe homeostasis.
机译：在高等植物中，禾本科物种具有独特的能力，可以通过分泌植物铁载体（PS）从碱性土壤中有效地获取铁（Fe）。铁（Ⅲ）-植物铁载体随后通过YS1转运蛋白被根吸收。以前通过卵母细胞的电生理分析对底物特异性进行的研究表明，Zea mays YS1介导了各种植物铁载体结合的金属（包括Zn，Cu，Ni以及较低的Mb和Cd）的运输。 ZmYS1还与烟碱胺（NA）（一种植物铁载体的结构类似物）一起转运Ni（Ⅱ）-，Fe（Ⅱ）-和Fe（Ⅲ）-配合物，据信在所有高等植物中它都起着细胞内金属螯合剂的作用。这些结果表明，ZmYS1编码广泛的金属-植物铁载体转运蛋白，该转运蛋白还转运Fe和Ni-烟碱胺，表明YS1转运蛋白在植物中的重金属稳态中具有新的作用（Schaaf等，2004a）。为了进一步研究植物铁载体系统在重金属吸收中的作用，研究了根部和枝条中ZmYS1的转录调控，其依赖于营养液中过量的重金属。我们的结果表明，ZmYS1不会因重金属浓度升高而上调，但会因铁缺乏而增强铁稳态中的特定作用。

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