中国林学（英文版）2006，Vol.8Issue(4)：1-5,5.
Modulation of leaf conductance by root to shoot signaling under water stress in Arabidopsis
Modulation of leaf conductance by root to shoot signaling under water stress in Arabidopsis
摘要
Abstract
Signal communication between root and shoot plays a crucial role in plant resistance to water stress. While many studies on root to shoot signals have been carried out in many plant species, no information is available for the model plant, Arabidopsis, whose adoption has great significance for further probing the molecular aspects of long distance stress signals. Here, we introduced the establishment of techniques for investigations of root to shoot signals in Arabidopsis. Stomatal movements in relation to root signals were probed by using these techniques. The results show that Arabidopsis is a suitable plant species for partial roots drying (PRD)experiments. In the PRD system, while no significant differences were found in leaf water potential between well-watered and stressed plants, water stress led to a decrease in leaf conductance, which suggests a regulation of stomatal movements by root to shoot signals. While water stress caused a significant increase in the concentration of sap abscisic acid (ABA) of xylem, no increase in xylem sap pH was observed. Moreover, the increase in the ABA content of xylem coincided with the decrease in leaf conductance,which suggests a possible role of ABA in the regulation of stomatal movements. Infrared temperature images showed that leaf temperatures of PRD plant were higher compared with those of well-watered plants, which further indicates that stomatal movements can be modulated by root signals. The confirmation of root to shoot signaling in Arabidopsis has established a basis for further investigation into the molecular mechanisms of the root to shoot signaling under water stress.关键词
Arabidopsis/water stress/ABA/leaf conductanceKey words
Arabidopsis/water stress/ABA/leaf conductance分类
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Fan Yi-juan,Liu Qing,Wei Kai-fa,Li Bing-bing,Ren Hui-bo,Gao Zhi-hui,Jia Wen-suo..Modulation of leaf conductance by root to shoot signaling under water stress in Arabidopsis[J].中国林学（英文版）,2006,8(4):1-5,5.基金项目
This work was supported by the State Basic Research and Development Plan of China (2003CB 114300) and the National Natural Science Foundation of China(Grant No. 30470160). （2003CB 114300）
