CO2 in leaves

Tom Buckley buckley at BIOSERVER.VSB.USU.EDU
Fri Feb 26 16:46:54 EST 1999


Kathleen,

If stomata are closed, there can be no net exchange of CO2 between the
intercellular spaces and the atmosphere: the net assimilation rate
(respiration minus photosynthesis) equals zero.  Or to put it another
way, respiration and photosynthesis are in balance.

The partial pressure of CO2 in the substomatal chamber at this point is
known as the 'CO2 compensation point'.  For most C3 plants it's in the
neighborhood of 30-50 ppm (3-5 Pa at sea level).

Cheers,
Tom Buckley
--
Thomas N. Buckley
Biology Department
Utah State University
Logan, UT 84322-5305
voice: 435-797-3567
fax: 435-797-1575
email: buckley at biology.usu.edu
------------------------------
"Science is the belief in the
   ignorance of experts."
 - Richard P. Feynman
"(Including oneself.)"
 - Tom Buckley
------------------------------





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