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Calculation of CO2 gas phase diffusion in leaves and its relation to stomatal resistance

Cary, John W. (1981) Calculation of CO2 gas phase diffusion in leaves and its relation to stomatal resistance. Photosynthesis Research. 2:185-194.

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Abstract

A new theory and experimental method was developed to measure the diffusion
resistance to CO? in the gas phase of mesophyll leaf tissue. Excised leaves were
placed in a chamber and their net evaporation and CO? assimilation rates measured
at two different ambient pressures. These data were used to calculate CO? gas phase
diffusion resistances. A variety of field grown leaves were tested and the effects of
various experimental errors considered. Increasing the gas phase diffusion resistance
decreased transpiration more than it decreased CO? assimilation. It was concluded
that gas phase diffusion resistance associated with CO? assimilation may sometimes
be 100 or 200 s•m-¹ greater than the resistance implied by transpiration rates. This
may be due to longer path lengths for the CO? diffusion, constricted in places by the
shape and arrangement of mesophyll cells.

Item Type: Article
NWISRL Publication Number: 0465
Subjects: Mass Import - unclassified
Depositing User: Dan Stieneke
Date Deposited: 20 Nov 2010 21:52
Last Modified: 23 Jan 2017 18:23
Item ID: 378
URI: https://eprints.nwisrl.ars.usda.gov/id/eprint/378