Carbon Dioxide and Water Vapor Exchange in Response to Drought in the Atmosphere and in the Soil

Carbon Dioxide and Water Vapor Exchange in Response to Drought in the Atmosphere and in the Soil The exchange of carbon dioxide (C02) and water vapor between plants and the atmosphere is regulated in the long term (days to weeks) by changes in leaf area I Abbreviations g, leaf conductance; Aw, difference in mole fraction of vapor between leaf and air; A, change of a parameter; 1jI, water potential. Subscripts m, r, s, x refer to mesophyU, root, soil, and xylem respectively. used: A , CO2-assimilation; Cj, interceUular CO2 concentration; E, transpiration; 0066-4294/86/0601-0247$02.00 SCHULZE and by the development of a photosynthetic apparatus in the leaf mesophyll, and in the short term (hours to days) by adjustment of photosynthetic capacity and changes in stomatal aperture. Regulation of gas exchange is important for plant performance, to maintain growth without dessication in an atmosphere in which the gradient for CO2 uptake between the ambient air and the intercellular air spaces is about 0. 1 mPaPa-l, whereas the gradient in water vapor concen­ tration between the hydrated living plant tissue and the atmosphere is for most situations greater than 10 mPaPa -I. Since nature has not evolved a membrane that is permeable to CO2 but nonpermeable to water vapor (23, 104), CO2 uptake for photosynthesis and water vapor loss http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Annual Review of Plant Biology Annual Reviews

Carbon Dioxide and Water Vapor Exchange in Response to Drought in the Atmosphere and in the Soil

Annual Review of Plant Biology, Volume 37 (1) – Jun 1, 1986

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Publisher
Annual Reviews
Copyright
Copyright 1986 Annual Reviews. All rights reserved
Subject
Review Articles
ISSN
1040-2519
D.O.I.
10.1146/annurev.pp.37.060186.001335
Publisher site
See Article on Publisher Site

Abstract

The exchange of carbon dioxide (C02) and water vapor between plants and the atmosphere is regulated in the long term (days to weeks) by changes in leaf area I Abbreviations g, leaf conductance; Aw, difference in mole fraction of vapor between leaf and air; A, change of a parameter; 1jI, water potential. Subscripts m, r, s, x refer to mesophyU, root, soil, and xylem respectively. used: A , CO2-assimilation; Cj, interceUular CO2 concentration; E, transpiration; 0066-4294/86/0601-0247$02.00 SCHULZE and by the development of a photosynthetic apparatus in the leaf mesophyll, and in the short term (hours to days) by adjustment of photosynthetic capacity and changes in stomatal aperture. Regulation of gas exchange is important for plant performance, to maintain growth without dessication in an atmosphere in which the gradient for CO2 uptake between the ambient air and the intercellular air spaces is about 0. 1 mPaPa-l, whereas the gradient in water vapor concen­ tration between the hydrated living plant tissue and the atmosphere is for most situations greater than 10 mPaPa -I. Since nature has not evolved a membrane that is permeable to CO2 but nonpermeable to water vapor (23, 104), CO2 uptake for photosynthesis and water vapor loss

Journal

Annual Review of Plant BiologyAnnual Reviews

Published: Jun 1, 1986

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