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Enhanced gravi- and phototropism in plant mdr mutants mislocalizing the auxin efflux protein PIN1

机译:植物mdr突变体中重力和向光性的增强使植物生长素外排蛋白PIN1错位

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Many aspects of plant growth and development are dependent on the flow of the hormone auxin down the plant from the growing shoot tip where it is synthesized(1,2). The direction of auxin transport in stems is believed to result from the basal localization within cells of the PIN1 membrane protein, which controls the efflux of the auxin anion(3). Mutations in two genes homologous to those encoding the P-glycoprotein ABC transporters that are especially abundant in multidrug-resistant tumour cells in animals(4) were recently shown to block polar auxin transport in the hypocotyls of Arabidopsis seedlings(5). Here we show that the mdr mutants display faster and greater gravitropism and enhanced phototropism instead of the impaired curvature development expected in mutants lacking polar auxin transport. We find that these phenotypes result from a disruption of the normal accumulation of PIN1 protein along the basal end of hypocotyl cells associated with basipetal auxin flow. Lateral auxin conductance becomes relatively larger as a result, enhancing the growth differentials responsible for tropic responses. [References: 14]
机译:植物生长和发育的许多方面取决于激素生长素从合成的生长梢开始向下流到植物的位置(1,2)。植物生长素在茎中的运输方向被认为是由PIN1膜蛋白细胞内的基础定位所决定的,PIN1膜蛋白可控制植物生长素阴离子的流出(3)。最近发现,与编码P-糖蛋白ABC转运蛋白的基因同源的两个基因中的突变在动物的多药耐药肿瘤细胞中尤为丰富(4),这可阻止极性植物生长素在拟南芥幼苗下胚轴中的转运(5)。在这里,我们显示mdr突变体显示更快和更大的重力和增强的向光性,而不是缺少极性生长素运输的突变体中预期的曲率发展受损。我们发现这些表型是由沿与基底生长素流相关的下胚轴细胞的基底末端的PIN1蛋白正常积累的破坏所致。结果,植物生长素的横向电导变得相对较大,从而增加了导致热带响应的生长差异。 [参考:14]

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