A small peptide modulates stomatal control via abscisic acid in long-distance signalling
A small peptide modulates stomatal control via abscisic acid in long-distance signalling
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DOI：
10.1038/s41586-018-0009-2
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发表时间：
2018-04-12
期刊：
影响因子：
64.8
通讯作者：
Shinozaki, Kazuo
中科院分区：
文献类型：
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作者：
Takahashi, Fuminori;Suzuki, Takehiro;Shinozaki, Kazuo
哺乳动物多肽荷尔蒙将细胞外刺激从敏感组织传播到适当的靶点，以实现最佳的生长维持(1)。在陆地植物中，根到冠的信号对于防止蒸腾失水和适应缺水条件是重要的。植物激素脱落酸在调节气孔运动以防止水分损失方面具有作用(4)。然而，目前还没有发现能够在叶片中引发脱落酸积累的移动信号分子。在这里，我们发现CLAVATA3/胚胎周围区域相关的25(CLE25)肽通过拟南芥的维管组织传递缺水信号，并通过几乎与叶片中的任何分生组织(BAM)受体相关的方式影响脱落酸的生物合成和蒸腾作用的气孔控制。CLE25基因在维管组织中表达，并在根中增强对脱水胁迫的响应。根来源的CLE25肽从根移动到叶，在那里它通过调节脱落酸的积累来诱导气孔关闭，从而增强对脱水胁迫的抗性。CLE25多肽诱导的叶片脱水胁迫反应需要BAM受体，因此CLE25-BAM模块可能是脱水反应中长距离信号传递的信号分子之一。
Mammalian peptide hormones propagate extracellular stimuli from sensing tissues to appropriate targets to achieve optimal growth maintenance(1). In land plants, root-to-shoot signalling is important to prevent water loss by transpiration and to adapt to water-deficient conditions(2,3). The phytohormone abscisic acid has a role in the regulation of stomatal movement to prevent water loss(4). However, no mobile signalling molecules have yet been identified that can trigger abscisic acid accumulation in leaves. Here we show that the CLAVATA3/EMBRYO-SURROUNDING REGION-RELATED 25 (CLE25) peptide transmits water-deficiency signals through vascular tissues in Arabidopsis, and affects abscisic acid biosynthesis and stomatal control of transpiration in association with BARELY ANY MERISTEM (BAM) receptors in leaves. The CLE25 gene is expressed in vascular tissues and enhanced in roots in response to dehydration stress. The root-derived CLE25 peptide moves from the roots to the leaves, where it induces stomatal closure by modulating abscisic acid accumulation and thereby enhances resistance to dehydration stress. BAM receptors are required for the CLE25 peptide-induced dehydration stress response in leaves, and the CLE25-BAM module therefore probably functions as one of the signalling molecules for long-distance signalling in the dehydration response.