PIN蛋白在生长素极性运输中的作用

PIN蛋白是生长素流出载体,它在细胞中的不对称分布决定细胞间生长素流方向。PIN蛋白网络系统决定生长素的极性运输,为植物体各部位的细胞提供了特异的位置和方向信息。从细胞水平上介绍PIN蛋白在生长素极性运输中的作用及对PIN蛋白功能调节的研究进展。

All Roads Lead to Auxin: Post-translational Regulation of Auxin Transport by Multiple Hormonal Pathways

Auxin is a key hormonal regulator,that governs plant growth and development in concert with other hormonal pathways.The unique feature of auxin is its polar,cell-to-cell transport that leads to the formation of local auxin maxima and gradients,which coordinate initiation and patterning of plant organs.The molecular machinery mediating polar auxin transport is one of the important points of interaction with other hormones.Multiple hormonal pathways converge at the regulation of auxin transport and form a regulatory network that integrates various developmental and environmental inputs to steer plant development.In this review,we discuss recent advances in understanding the mechanisms that underlie regulation of polar auxin transport by multiple hormonal pathways.Specifically,we focus on the post-translational mechanisms that contribute to fine-tuning of the abundance and polarity of auxin transporters at the plasma membrane and thereby enable rapid modification of the auxin flow to coordinate plant growth and development.

生长素极性运输中PIN蛋白磷酸化修饰研究进展

生长素在植物生长发育过程中具有重要功能,调控其生长发育的诸多过程。生长素通过极性运输建立浓度梯度,维持植物组织器官形成、生长以及形态建成。而PIN蛋白作为生长素运输载体在细胞膜上不对称分布,决定生长素流向,形成浓度梯度,为植物体内各部位细胞的生长发育提供特异的位置和方向信息。在此过程中PIN蛋白磷酸化/去磷酸化修饰以及网格蛋白所介导的胞吞作用等影响着PIN蛋白的极性分布,从而调控植株的形态建成。本研究主要讨论了PIN蛋白磷酸化修饰在生长素极性运输中作用机制,为深入剖析生长素极性运输中PIN蛋白磷酸化机制提供新的见解,也为进一步揭示生长素运输调控的作用机理提供理论参考。