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Nutrient Influences on Leaf Photosynthesis

EFFECTS OF NITROGEN, PHOSPHORUS, AND POTASSIUM FOR GOSSYPIUM HIRSUTUM L. ¹

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

The net rate of CO₂ uptake for leaves of Gossypium hirsutum L. was reduced when the plants were grown at low concentrations of NO₃^-, PO₄^2-, or K⁺. The water vapor conductance was relatively constant for all nutrient levels, indicating little effect on stomatal response. Although leaves under nutrient stress tended to be lower in chlorophyll and thinner, the ratio of mesophyll surface area to leaf area did not change appreciably. Thus, the reduction in CO₂ uptake rate at low nutrient levels was due to a decrease in the CO₂ conductance expressed per unit mesophyll cell wall area (g^cell_CO2). The use of g^cell_CO2 and nutrient levels expressed per unit of mesophyll cell wall provides a new means of assessing nutrient effects on CO₂ uptake of leaves.

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

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