[植物演化] 生長素運輸的調控演化。 20191112 Nature Plants

Plasmodesmata
Nov 12, 2019
1 min read

PIN-driven auxin transport emerged early in streptophyte evolution

Roman Skokan, Eva Medvecká, Tom Viaene, Stanislav Vosolsobě, Marta Zwiewka, Karel Müller, Petr Skůpa, Michal Karady, Yuzhou Zhang, Dorina P. Janacek, Ulrich Z. Hammes, Karin Ljung, Tomasz Nodzyński, Jan Petrášek and Jiří Friml

Abstract

PIN-FORMED (PIN) transporters mediate directional, intercellular movement of the phytohormone auxin in land plants. To elucidate the evolutionary origins of this developmentally crucial mechanism, we analysed the single PIN homologue of a simple green alga Klebsormidium flaccidum. KfPIN functions as a plasma membrane-localized auxin exporter in land plants and heterologous models. While its role in algae remains unclear, PIN-driven auxin export is probably an ancient and conserved trait within streptophytes.

在鍊型植物演化時就衍生出來由PIN來引導的生長素運輸

摘要

PIN運輸蛋白（突變形成像針一樣的花芽，所以命名為PIN-FORMED）調控了陸生植物生長素在細胞間有方向性的移動。為了要闡明這個在發育上重要機制的來源，我們分析了在綠色藻類鍊藻（Klebsormidium flaccidum）中的單一PIN同源基因。KfPIN在陸生植物以及異源系統（不是本來基因來源的植物系統）中，扮演著座落在細胞膜上的生長素運輸功能。雖然在藻類中PIN的功能仍然不清楚，但是由PIN來運輸生長素的機制很可能是個從鍊型藻類就存在，古老並且很保存良好的機制。