Drought response of mesophyll conductance in forest understory species--impacts on water-use efficiency and interactions with leaf water movement.
Drought response of mesophyll conductance in forest understory species--impacts on water-use efficiency and interactions with leaf water movement.
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DOI：
10.1111/ppl.12160
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发表时间：
2014-09
影响因子：
6.4
通讯作者：
R. Hommel;R. Siegwolf;M. Saurer;G. Farquhar;Z. Kayler;J. Ferrio;A. Gessler
中科院分区：
文献类型：
--
作者：
R. Hommel;R. Siegwolf;M. Saurer;G. Farquhar;Z. Kayler;J. Ferrio;A. Gessler
气孔导度和叶肉导度的调节是优化植物失水与碳吸收关系的有效手段。我们评估了水分利用效率（WUE）为基础的干旱适应策略，就不同功能植物组的森林林下植物的叶肉电导率。此外，我们的目的是评估的机制和水和CO2之间的相互作用在叶肉电导。事实上，只有在两个物种，增加通用汽车在应对中度干旱，并在所有五个物种的研究，叶肉电导率的变化显着相关的干旱引起的WUE的变化，增加WUE，证明了通用汽车在优化资源利用的重要性，在水分限制。有没有明确的相关性叶肉CO2电导率和水分运动的曲折度在五个物种在控制和干旱处理。这表明，要么CO2和水在叶肉中的不同主要途径，要么共同途径的不同调节。
Regulation of stomatal (gs ) and mesophyll conductance (gm ) is an efficient means for optimizing the relationship between water loss and carbon uptake in plants. We assessed water-use efficiency (WUE)-based drought adaptation strategies with respect to mesophyll conductance of different functional plant groups of the forest understory. Moreover we aimed at assessing the mechanisms of and interactions between water and CO2 conductance in the mesophyll. The facts that an increase in WUE was observed only in the two species that increased gm in response to moderate drought, and that over all five species examined, changes in mesophyll conductance were significantly correlated with the drought-induced change in WUE, proves the importance of gm in optimizing resource use under water restriction. There was no clear correlation of mesophyll CO2 conductance and the tortuosity of water movement in the leaf across the five species in the control and drought treatments. This points either to different main pathways for CO2 and water in the mesophyll either to different regulation of a common pathway.