Abstract:
:At constant cladode temperature the stomatal resistance of O. inermis increased when the cladode-air vapor pressure difference was increased and stomatal resistance decreased when the cladode-air vapor pressure difference was lowered. Net CO2 fixation in the dark was very responsive to these humidity dependent changes in stomatal resistance. Net CO2 fixation and stomatal resistance in the light did not respond to changes in cladode-air vapor pressure differences in the light under the conditions tested. When temperature response functions for dark CO2 fixation were examined at constant ambient humidity, the reduction in dark CO2 fixation at higher temperatures was largely due to stomatal closure in response to the increased vapor pressure difference. The water requirement for net CO2 fixation in the dark at typical nocturnal vapor pressure differences was about 10 times lower than that of net CO2 fixation in the light at vapor pressure differences typical of the late afternoon. The role of the stomatal responses to humidity in determining the patterns and rates of net CO2 exchange in the light or dark, and its possible ecological significance is discussed.
journal_name
Oecologiajournal_title
Oecologiaauthors
Osmond CB,Ludlow MM,Davis R,Cowan IR,Powles SB,Winter Kdoi
10.1007/BF00344837subject
Has Abstractpub_date
1979-07-01 00:00:00pages
65-76issue
1eissn
0029-8549issn
1432-1939pii
10.1007/BF00344837journal_volume
41pub_type
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