Department of Molecular Plant Physiology, Institute for Water and Wetland Research, Radboud University Nijmegen, Nijmegen, The Netherlands.
Laboratory of Molecular Biology and Business Unit Bioscience, Wageningen University & Research, Wageningen, The Netherlands.
J Exp Bot. 2019 Jan 1;70(1):17-27. doi: 10.1093/jxb/ery332.
The family of small auxin up-regulated RNA (SAUR) genes is a family of auxin-responsive genes with ~60-140 members in most higher plant species. Despite the early discovery of their auxin responsiveness, their function and mode of action remained unknown for a long time. In recent years, the importance of SAUR genes in the regulation of dynamic and adaptive growth, and the molecular mechanisms by which SAUR proteins act are increasingly well understood. SAURs play a central role in auxin-induced acid growth, but can also act independently of auxin, tissue specifically regulated by various other hormone pathways and transcription factors. In this review, we summarize recent advances in the characterization of the SAUR genes in Arabidopsis and other plant species. We particularly elaborate on their capacity to fine-tune growth in response to internal and external signals, and discuss the breakthroughs in understanding the mode of action of SAURs in relation to their complex regulation.
小生长素上调 RNA（SAUR）基因家族是一个生长素响应基因家族，在大多数高等植物物种中约有 60-140 个成员。尽管它们对生长素的反应很早就被发现，但它们的功能和作用模式在很长一段时间内仍然未知。近年来，SAUR 基因在调节动态和适应性生长中的重要性，以及 SAUR 蛋白作用的分子机制，越来越被人们所理解。SAUR 基因在生长素诱导的酸生长中起核心作用，但也可以独立于生长素发挥作用，受到各种其他激素途径和转录因子的组织特异性调节。在这篇综述中，我们总结了近年来对拟南芥和其他植物物种中 SAUR 基因的特征描述方面的进展。我们特别详细阐述了它们响应内部和外部信号精细调节生长的能力，并讨论了在理解 SAUR 作用模式方面的突破，以及它们与复杂调控的关系。
