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美国卫生研究院文献>BMC Plant Biology
>Molecular and phylogenetic characterization of the sieve element occlusion gene family in Fabaceae and non-Fabaceae plants
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Molecular and phylogenetic characterization of the sieve element occlusion gene family in Fabaceae and non-Fabaceae plants
BackgroundThe phloem of dicotyledonous plants contains specialized P-proteins (phloem proteins) that accumulate during sieve element differentiation and remain parietally associated with the cisternae of the endoplasmic reticulum in mature sieve elements. Wounding causes P-protein filaments to accumulate at the sieve plates and block the translocation of photosynthate. Specialized, spindle-shaped P-proteins known as forisomes that undergo reversible calcium-dependent conformational changes have evolved exclusively in the Fabaceae. Recently, the molecular characterization of three genes encoding forisome components in the model legume Medicago truncatula (MtSEO1, MtSEO2 and MtSEO3; SEO = sieve element occlusion) was reported, but little is known about the molecular characteristics of P-proteins in non-Fabaceae.
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机译:背景双子叶植物的韧皮部含有专门的P蛋白(韧皮部蛋白),这些蛋白在筛分元件分化过程中积累,并在成熟的筛分元件中与内质网的池池保持顶壁相关。受伤会使P蛋白丝堆积在筛板上,并阻止光合产物的转运。特异的纺锤形P蛋白,称为甲状旁腺,会经历可逆的钙依赖性构象变化,仅在豆科中进化。最近,已报道了在豆科植物苜蓿模型中编码三种主要成分的基因的分子表征(MtSEO1,MtSEO2和MtSEO3; SEO =筛子元素闭塞),但对于非豆科植物中P蛋白的分子特征知之甚少。
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