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Stomatal Behavior of Forest Trees in Relation to Hydraulic, Chemical, and Environmental Factors

  • Robert M. Augé
Part of the Ecological Studies book series (ECOLSTUD, volume 166)

Abstract

Stomata regulate plant carbon gain, water loss, and other physiological determinants of forest productivity. Our ability to assess impacts of environmental changes on forest ecosystems relies heavily, therefore, on understanding stomatal function and control. The recent discovery of nonhydraulic, root-sourced stress Signals is changing our understanding of how plants “sense” and how stomata respond to fluctuations in soil moisture. Formerly, it had been widely held that stomatal conductance (g s ) was hydraulically regulated by leaf water potential (Ψ) or turgor potential (Ψ p ) Kramer and Boyer 1995), at least in anisohydric plants (Tardieu et al. 1996; Tardieu and Simmoneau 1998). However, there are several instances in which g s was inhibited in drying soils even in the absence of perturbations in leaf water Status (Davies et al. 1994). Such studies suggest that stomatal closure resulting from soil-water depletion can be mediated by changes in root water Status through effects on the chemical flow of Information from root to shoot.

Keywords

Stomatal Conductance Photosynthetic Photon Flux Density Plant Cell Environ Stomatal Response Stomatal Behavior 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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© Springer Science+Business Media New York 2003

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  • Robert M. Augé

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