Abstract
The effect of leaf water deficit on net CO2 assimilation was studied under two conditions: in one, the stomata were allowed to contribute to the regulation of CO2 assimilation; in the other, air was forced through the leaf at a constant rate to overcome the effects of change in stomatal resistance accompanying changes in leaf water deficit. When the stomata were allowed to regulate the gaseous diffusive resistance of the leaf, CO2 assimilation decreased with increasing leaf water deficit. However, when air was forced through the leaf, the rate of assimilation was not inhibited by increasing leaf water deficit. The results indicate that the inhibition of net CO2 assimilation with increasing leaf water deficit is a consequence of an increase in the diffusive resistance to gas exchange and not of a change in apparent mesophyll resistance.
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Selected References
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- Boyer J. S. Differing sensitivity of photosynthesis to low leaf water potentials in corn and soybean. Plant Physiol. 1970 Aug;46(2):236–239. doi: 10.1104/pp.46.2.236. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Boyer J. S. Nonstomatal inhibition of photosynthesis in sunflower at low leaf water potentials and high light intensities. Plant Physiol. 1971 Nov;48(5):532–536. doi: 10.1104/pp.48.5.532. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Mederski H. J., Curry R. B., Chen L. H. Effects of irradiance and leaf water deficit on net carbon dioxide assimilation and mesophyll and transport resistances. Plant Physiol. 1975 Apr;55(4):594–597. doi: 10.1104/pp.55.4.594. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Shimshi D. Effect of Soil Moisture and Phenylmercuric Acetate upon Stomatal Aperture, Transpiration, and Photosynthesis. Plant Physiol. 1963 Nov;38(6):713–721. doi: 10.1104/pp.38.6.713. [DOI] [PMC free article] [PubMed] [Google Scholar]