From: IN%"hlgorton at osprey.smcm.edu" "Holly Gorton" 20-NOV-1996 10:45:54.15
To: IN%"Peggy.Pollak at NAU.EDU"
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Subj: photorespiration in CAM plants -Reply
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Date: Wed, 20 Nov 1996 12:38:54 -0500
From: Holly Gorton <hlgorton at osprey.smcm.edu>
Subject: photorespiration in CAM plants -Reply
To: Peggy.Pollak at NAU.EDU
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Peggy-
CAM is a CO2 concentrating mechanism. If CO2 is high, the ratio of
CO2 to O2 is low, and photorespiration is not favored. The
decarboxylation of organic acids that occurs during the day releases
CO2, but it can't get out because stomata are closed. Hence CO2
levels rise inside the leaf so it can outcompete O2 and carboxylation
by RUBISCO is favored over photorespiration.
-Holly
