The phytohormone auxin acts as an amazingly versatile coordinator of plant growth and development. With its morphogen-like properties, auxin controls sites and timing of differentiation and/or growth responses both, in quantitative and qualitative terms. Specificity in the auxin response depends largely on distinct modes of signal transmission, by which individual cells perceive and convert auxin signals into a remarkable diversity of responses. The best understood, or so-called canonical mechanism of auxin perception ultimately results in variable adjustments of the cellular transcriptome, via a short, nuclear signal transduction pathway. Additional findings that accumulated over decades implied that an additional, presumably, cell surface-based auxin perception mechanism mediates very rapid cellular responses and decisively contributes to the cell's overall hormonal response. Recent investigations into both, nuclear and cell surface auxin signalling challenged this assumed partition of roles for different auxin signalling pathways and revealed an unexpected complexity in transcriptional and non-transcriptional cellular responses mediated by auxin.

中文翻译：

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生长素信号的增长：Schrödinger的猫从袋子里出来。

植物激素生长素是植物生长和发育的惊人多用途协调员。生长素具有类似形态原的特性，可以定量和定性地控制分化和/或生长反应的部位和时间。植物生长素应答的特异性在很大程度上取决于信号传输的不同模式，单个细胞通过该模式来感知植物生长素信号并将其转化为反应的显着多样性。生长素知觉的最佳理解或所谓的经典机制最终通过短的核信号传导途径导致细胞转录组的可变调节。数十年来积累的其他发现暗示，可能还有另外的发现，基于细胞表面的生长素感知机制介导了非常快速的细胞反应，并决定性地促进了细胞的整体激素反应。对核和细胞表面生长素信号传导的最新研究挑战了这种假定的不同生长素信号传导途径的作用分配，并揭示了由生长素介导的转录和非转录细胞应答的意想不到的复杂性。