Wisniewska Justyna, Xu Jian, Seifertová Daniela, Brewer Philip B, Ruzicka Kamil, Blilou Ikram, Rouquié David, Benková Eva, Scheres Ben, Friml Jirí
Center for Plant Molecular Biology (ZMBP), Tübingen University, D-72076 Tübingen, Germany.
Science. 2006 May 12;312(5775):883. doi: 10.1126/science.1121356. Epub 2006 Apr 6.
Polar flow of the phytohormone auxin requires plasma membrane-associated PIN proteins and underlies multiple developmental processes in plants. Here we address the importance of the polarity of subcellular PIN localization for the directionality of auxin transport in Arabidopsis thaliana. Expression of different PINs in the root epidermis revealed the importance of PIN polar positions for directional auxin flow and root gravitropic growth. Interfering with sequence-embedded polarity signals directly demonstrates that PIN polarity is a primary factor in determining the direction of auxin flow in meristematic tissues. This finding provides a crucial piece in the puzzle of how auxin flow can be redirected via rapid changes in PIN polarity.
植物激素生长素的极性运输需要与质膜相关的PIN蛋白，并且是植物多个发育过程的基础。在这里，我们探讨了拟南芥中亚细胞PIN定位的极性对于生长素运输方向性的重要性。在根表皮中不同PIN的表达揭示了PIN极性位置对于生长素定向流动和根向重力性生长的重要性。干扰序列嵌入的极性信号直接表明PIN极性是决定分生组织中生长素流动方向的主要因素。这一发现为生长素流动如何通过PIN极性的快速变化而重新定向这一谜题提供了关键线索。
