Hydraulic and chemical signalling in the control of stomatal conductance and transpiration
Hydraulic and chemical signalling in the control of stomatal conductance and transpiration
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DOI：
10.1093/jexbot/53.367.195
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发表时间：
2002-02-01
影响因子：
6.9
通讯作者：
Comstock, JP
中科院分区：
文献类型：
--
作者：
Comstock, JP
脱落酸（阿坝）是干旱胁迫下气孔关闭的重要调节因子，在木质部中由根向地上部运输，并被保卫细胞所感知。这为植物提供了气孔响应机制，其中根中的水势被认为是土壤水分状况和可用水资源的指示。也有充分的证据表明，气孔直接响应叶水分状况的某些组成部分。这提供了额外的信息，水势梯度发展之间的根和地上部之间的水运输的结果，允许更稳定的调节地上部水分状况和更好地保护运输系统本身。然而，叶水状态被感知的精确位置，以及将该信号转导成保卫细胞反应的分子事件尚不清楚。因此，主要的问题仍然没有答案，在根和叶的位置被认为是水分胁迫信号集成在保卫细胞控制气孔行为。
Abscisic acid (ABA) transported in the xylem from root to shoot and perceived at the guard cell is now widely studied as an essential regulating factor in stomatal closure under drought stress. This provides the plant with a stomatal response mechanism in which water potential is perceived in the root as an indication of soil water status and available water resources. There is also ample evidence that stomata respond directly to some component of leaf water status. This provides additional information about water potential gradients developing between root and shoot as the result of water transport, allowing for a more stable regulation of shoot water status and better protection of the transport system itself. The precise location at which leaf water status is sensed, however, and the molecular events transducing this signal into a guard cell response are not yet known. Major questions therefore remain unanswered on how water stress signals perceived at root and leaf locations are integrated at the guard cell to control stomatal behaviour.