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Plant Physiology 63:700-703 (1979)
© 1979 American Society of Plant Biologists

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Articles

Salinity Effects on Leaf Anatomy

Consequences for Photosynthesis 1

David J. Longstreth and Park S. Nobel

a Department of Biology and Division of Environmental Biology of the Laboratory of Nuclear Medicine and Radiation Biology, University of California, Los Angeles, California 90024

Increasing salinity led to substantially higher ratios of mesophyll surface area to leaf area (Ames/A) for Phaseolus vulgaris and Gossypium hirsutum and a smaller increase for Atriplex patula, a salt-tolerant species. The increase in internal surface for CO2 absorption did not lead to higher CO2 uptake rates, since the CO2 resistance expressed on the basis of mesophyll cell wall area (rcell) increased even more with salinity. The differences among species in the sensitivity of photosynthesis to salinity in part reflect the different Ames/A and rcell responses.

1 This investigation was supported by National Science Foundation Grant DEB 77-11128.




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