To respond to auxin, the chief orchestrator of their multicellularity, plants evolved multiple receptor systems and signal transduction cascades. Despite decades of research, however, we are still lacking a satisfactory synthesis of various auxin signaling mechanisms. The chief discrepancy and historical controversy of the field is that of rapid and slow auxin effects on plant physiology and development. How is it possible that ions begin to trickle across the plasma membrane as soon as auxin enters the cell, even though the best-characterized transcriptional auxin pathway can take effect only after tens of minutes? Recently, unexpected progress has been made in understanding this and other unknowns of auxin signaling. We provide a perspective on these exciting developments and concepts whose general applicability might have ramifications beyond auxin signaling.

为了响应生长素（多细胞性的主要协调者），植物进化出了多种受体系统和信号转导级联。然而，尽管经过了数十年的研究，我们仍然缺乏各种生长素信号机制的令人满意的合成。该领域的主要差异和历史争议在于生长素对植物生理和发育的快速和缓慢影响。尽管最典型的转录生长素途径只能在数十分钟后生效，但一旦生长素进入细胞，离子怎么可能开始穿过质膜？最近，在了解生长素信号传导的这一未知因素和其他未知因素方面取得了意想不到的进展。我们对这些令人兴奋的发展和概念提供了一个视角，其普遍适用性可能会产生超出生长素信号传导的影响。