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The efficiency of water use in water stressed plants is increased due to ABA induced stomatal closure

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Abstract

Gas exchange and abscisic acid content of Digitalis lanata EHRH. have been examined at different levels of plant water stress. Net photosynthesis, transpiration and conductance of attached leaves declined rapidly at first, then more slowly following the withholding of irrigation. The intercellular partial pressure of CO2 decreased slightly. The concentration of 2-cis(S)ABA increased about eight-fold in the leaves of non-irrigated plants as compared with well-watered controls. A close linear correlation was found between the ABA content of the leaves and their conductance on a leaf area basis. In contrast, the plot of net assimilation versus ABA concentration was curvilinear, leading to an increased efficiency of water use during stress. After rewatering, photosynthesis reached control values earlier than transpiration, leaf conductance and ABA content. From these data it is concluded that transpiration through the stomata is directly controlled by the ABA content, whereas net photosynthesis is influenced additionally by other factors.

Possible reasons for the responses of photosynthesis and water use efficiency to different stress and ABA levels are discussed.

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Abbreviations

A:

net CO2 assimilation

ABA:

abscisic acid

Ci :

intercellular CO2 concentration

g:

stomatal conductance

T:

transpiration

WUE:

water use efficiency

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Authors and Affiliations

  1. FB Biologie der Universität, Postfach 3049, D-6750, Kaiserslautern, FRG

    Barbara Steuer, Thomas Stuhlfauth & Heinrich P. Fock

Authors
  1. Barbara Steuer
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  2. Thomas Stuhlfauth
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  3. Heinrich P. Fock
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Steuer, B., Stuhlfauth, T. & Fock, H.P. The efficiency of water use in water stressed plants is increased due to ABA induced stomatal closure. Photosynth Res 18, 327–336 (1988). https://doi.org/10.1007/BF00034837

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  • DOI: https://doi.org/10.1007/BF00034837

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