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Correlations of stomatal conductance with hydraulic and chemical factors in several deciduous tree species in a natural habitat

Published online by Cambridge University Press:  01 March 2000

ROBERT M. AUGÉ ,
CRAIG D. GREEN ,
ANN J. W. STODOLA ,
ARNOLD M. SAXTON ,
JOSHUA B. OLINICK  and
RICHARD M. EVANS
ROBERT M. AUGÉ
Affiliation:
Institute of Agriculture, Tennessee Agricultural Experiment Station, University of Tennessee, P.O. Box 1071, Knoxville, TN 37901–1071 USA
CRAIG D. GREEN
Affiliation:
Institute of Agriculture, Tennessee Agricultural Experiment Station, University of Tennessee, P.O. Box 1071, Knoxville, TN 37901–1071 USA
ANN J. W. STODOLA
Affiliation:
Institute of Agriculture, Tennessee Agricultural Experiment Station, University of Tennessee, P.O. Box 1071, Knoxville, TN 37901–1071 USA
ARNOLD M. SAXTON
Affiliation:
Institute of Agriculture, Tennessee Agricultural Experiment Station, University of Tennessee, P.O. Box 1071, Knoxville, TN 37901–1071 USA
JOSHUA B. OLINICK
Affiliation:
Institute of Agriculture, Tennessee Agricultural Experiment Station, University of Tennessee, P.O. Box 1071, Knoxville, TN 37901–1071 USA
RICHARD M. EVANS
Affiliation:
Institute of Agriculture, Tennessee Agricultural Experiment Station, University of Tennessee, P.O. Box 1071, Knoxville, TN 37901–1071 USA
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Abstract

Recent research in whole-plant stomatal physiology, conducted largely with potted plants in controlled environments, suggests that stomatal conductance (gs) might be more closely linked to plant chemical variables than to hydraulic variables. To test this in a field situation, seasonal gs was examined in relation to a number of plant and environmental variables in 11 temperate, deciduous forest tree species. Stomatal conductance was generally better correlated with environmental variables (air temperature, vapor pressure deficit, PPFD) than with plant variables, and slightly better correlated with plant hydraulic variables (shoot water and osmotic potentials) than with plant chemical variables (xylem sap ABA concentration, xylem sap pH). We examined a model, developed previously for maize, which describes regulation of gs by xylem sap ABA concentration with leaf water status acting to modify stomatal sensitivity to the ABA signal. This model explained slightly more variation in seasonal gs in the forest trees than did single plant variables but not more variation than most single environmental variables. Response surface models, especially those incorporating environmental variables, were more consistently successful at explaining gs across species.

Keywords

abscisic acidmaplesoakspH of xylem sapstomatal conductancetemperate treeswater potential
Type
Research Article
Information
The New Phytologist , Volume 145 , Issue 3 , March 2000 , pp. 483 - 500
Copyright
© Trustees of the New Phytologist 2000

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