Stomatal Response of Populus Clones to Light Intensity and Vapor Pressure Deficit
- 1 July 1979
- journal article
- research article
- Published by Oxford University Press (OUP) in Plant Physiology
- Vol. 64 (1) , 112-114
- https://doi.org/10.1104/pp.64.1.112
Abstract
Responses of stomata of clones of P. candicans Ait. .times. P. berolinensis Dipp. and P. deltoides Bartr. .times. P. caudina (Ten.) Bugala to 2 levels of light intensity and vapor pressure deficit were studied in controlled environments. Significant stomatal responses to light and vapor pressure deficit were observed. Interactive effects of low light intensity and high vapor pressure deficit elicited greater stomatal closure than was obtained under low light or high vapor pressure deficit alone, indicating adaptation for increased water use efficiency under conditions unfavorable for photosynthesis relative to transpiration. Adaxial stomata of both clones were more sensitive than abaxial stomata to changing vapor pressure deficit and light intensity. Stomatal response to vapor pressure deficit appeared to be independent of bulk leaf water status. Stomata of P. candicans .times. P. berolinensis were more sensitive than stomata of P. deltoides .times. P. caudina to a change in vapor pressure deficit and less sensitive to a change in light intensity. The sensitivity of stomata of P. candicans .times. P. berolinensis to vapor pressure deficit may be related to drought resistance in its parentage (P. berolinensis).Keywords
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