Marhava Petra
Department of Forest Genetics and Plant Physiology, Umeå Plant Science Centre (UPSC), University of Agricultural Sciences (SLU), 90183, Umeå, Sweden.
New Phytol. 2022 Jan;233(2):624-630. doi: 10.1111/nph.17867. Epub 2021 Dec 9.
Polar localization of PIN-FORMED proteins (PINs) at the plasma membrane is essential for plant development as they direct the transport of phytohormone auxin between cells. PIN polar localization to certain sides of a given cell is dynamic, strictly regulated and provides directionality to auxin flow. Signals that act upstream to control subcellular PIN localization modulate auxin distribution, thereby regulating diverse aspects of plant development. Here I summarize the current understanding of mechanisms by which PIN polarity is established, maintained and rearranged to provide a glimpse into the complexity of PIN polarity.
PIN 形成蛋白（PINs）在质膜上的极性定位对于植物发育至关重要，因为它们指导细胞间植物激素生长素的运输。PIN 在给定细胞特定侧面的极性定位是动态的，受到严格调控，并为生长素流动提供方向性。在亚细胞水平上控制 PIN 定位的上游信号调节生长素分布，从而调控植物发育的多个方面。在此，我总结了目前对 PIN 极性建立、维持和重新排列机制的理解，以一窥 PIN 极性的复杂性。
