A hydraulic signal in root-to-shoot signalling of water shortage
A hydraulic signal in root-to-shoot signalling of water shortage
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DOI：
10.1111/j.1365-313x.2007.03234.x
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发表时间：
2007-10-01
期刊：
影响因子：
7.2
通讯作者：
Grill, Erwin
中科院分区：
文献类型：
--
作者：
Christmann, Alexander;Weiler, Elmar W.;Grill, Erwin
植物的光合作用和生物量生产受土壤水分状况的控制。在土壤干燥时，植物可以通过气孔（叶片的可闭孔）减少蒸腾作用来减少水分消耗。植物激素脱落酸（ABA）介导气孔关闭，是将水分亏缺从根部传递到茎部的指定信号。然而，我们的研究并不支持ABA作为长距离信号。茎部对有限土壤水分的响应不受根系产生ABA能力的影响；然而，这种反应确实需要ABA的生物合成和在茎部的信号传导。土壤水分胁迫引起茎部的水力响应，这先于ABA信号和气孔关闭。在各种植物中，水力响应的衰减阻止了水分胁迫的长距离信号传递，这与水力信号通过根到茎的通信一致。
Photosynthesis and biomass production of plants are controlled by the water status of the soil. Upon soil drying, plants can reduce water consumption by minimizing transpiration through stomata, the closable pores of the leaf. The phytohormone abscisic acid ( ABA) mediates stomatal closure, and is the assigned signal for communicating water deficit from the root to the shoot. However, our study does not support ABA as the proposed long-distance signal. The shoot response to limited soil water supply is not affected by the capacity to generate ABA in the root; however, the response does require ABA biosynthesis and signalling in the shoot. Soil water stress elicits a hydraulic response in the shoot, which precedes ABA signalling and stomatal closure. Attenuation of the hydraulic response in various plants prevented long-distance signalling of water stress, consistent with root-to-shoot communication by a hydraulic signal.