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 concenÂ 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
Annual Review of Plant Biology – Annual Reviews
Published: Jun 1, 1986
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