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General relations of stomatal responses to xylem sap abscisic acid under stress in the rooting zone - A global perspective

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http://pubman.mpdl.mpg.de/cone/persons/resource/persons62549

Schulze,  E. D.
Department Biogeochemical Processes, Prof. E.-D. Schulze, Max Planck Institute for Biogeochemistry, Max Planck Society;

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Heilmeler, H., Schulze, E. D., Fan, J., & Hartung, W. (2007). General relations of stomatal responses to xylem sap abscisic acid under stress in the rooting zone - A global perspective. Flora, 202(8), 624-636. doi:10.1016/j.flora.2007.06.002.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000E-D519-D
Abstract
A sensitivity factor that quantifies the responsiveness of stomata to xylem sap abscisic acid concentration ([ABA](xy1)) is described, using the relation between [ABA](xy1) and maximum leaf conductance (g(max)). Plotting g(max) against this factor results in a common linear relationship for woody and herbaceous species from boreal to (semi-) and climates. The global distribution of the sensitivity factor reveals an unexpected pattern which is inverse to rainfall, i.e., plants in humid climates respond more sensitively to ABA than plants in arid areas. The implications for the response of natural vegetation and consequences for agriculture are discussed. (C) 2007 Elsevier GmbH. All rights reserved. [References: 66]