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JXB Advance Access originally published online on July 16, 2003
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Journal of Experimental Botany, Vol. 54, No. 390, pp. 2141-2147, September 1, 2003
© 2003 Oxford University Press

Relative humidity is a key factor in the acclimation of the stomatal response to CO2

Received 25 April 2003; Accepted 9 May 2003

Lawrence D. Talbott, Eran Rahveh*, and Eduardo Zeiger{dagger},

Department of Organismal Biology, Ecology and Evolution, University of California, Los Angeles, CA 90024, USA

* Present address: Institute of Horticulture, Agricultural Research Organization, Volcani Center, POB 6, Bet-Dagan 50250, Israel.
{dagger} To whom correspondence should be addressed. Fax: +1 310 825 9433. E-mail: zeiger{at}biology.ucla.edu

Previous work has shown that stomata of growth chamber-grown Vicia faba leaves have an enhanced CO2 response when compared with stomata of greenhouse-grown plants. This guard cell response to CO2 acclimatizes to the environmental conditions on the transfer of plants between the two environments. In the present study, air relative humidity is identified as a key environmental factor mediating the changes in stomatal sensitivity to CO2. In the greenhouse environment, elevation of relative humidity to growth chamber levels resulted in an enhanced CO2 response, whereas a reduction in the light level to that comparable to growth chamber conditions had no effect on stomatal CO2 sensitivity. The transfer of plants between humidified and normal greenhouse conditions resulted in an acclimation response with a time-course matching that previously obtained in transfers of plants between greenhouse and growth chamber environments. The high stomatal sensitivity to CO2 of growth chamber-grown plants could be reduced by lowering growth chamber relative humidity and then restored with its characteristic acclimation time-course by an elevation of relative humidity. Leaf temperature was unchanged during this restoration, eliminating it as a primary factor in the acclimation response. Humidity regulation of stomatal CO2 sensitivity could function as a signal for leaves inside dense foliage canopies, promoting stomatal opening under low light, low CO2 conditions.

Key words: Acclimatization, carbon dioxide, relative humidity, stomata, Vicia faba.


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