Plant Physiology 98:1429-1436 (1992)
© 1992 American Society of Plant Biologists
Metabolism and Enzymology
Theoretical Considerations when Estimating the Mesophyll Conductance to CO2 Flux by Analysis of the Response of Photosynthesis to CO2 1
Peter C. Harley,
Francesco Loreto,
Giorgio Di Marco and
Thomas D. Sharkey
Systems Ecology Research Group, San Diego State University, San Diego, California 92182,
Istituto di Radiobiochimica ed Ecofisiologia Vegetale, (Consiglio Nazionale delle Ricerche-IREV), Area della Ricerca del CNR, 00016 Monterotondo Scalo, Roma, Italy,
Department of Botany, University of Wisconsin, Madison, Wisconsin 53706
The conductance for CO2 diffusion in the mesophyll of leaves can limit photosynthesis. We have studied two methods for determining the mesophyll conductance to CO2 diffusion in leaves. We generated an ideal set of photosynthesis rates over a range of partial pressures of CO2 in the stroma and studied the effect of altering the mesophyll diffusion conductance on the measured response of photosynthesis to intercellular CO2 partial pressure. We used the ideal data set to test the sensitivity of the two methods to small errors in the parameters used to determine mesophyll conductance. The two methods were also used to determine mesophyll conductance of several leaves using measured rather than ideal data sets. It is concluded that both methods can be used to determine mesophyll conductance and each method has particular strengths. We believe both methods will prove useful in the future.
1 Research supported by Department of Energy grant FG02-87ER13785 to T.D.S. and National Research Council of Italy, Special Project RAISA, sub-project No. 2, paper No. 252 to G.D. F.L. was supported by Consiglio Nazionale della Ricerche and North Atlantic Treaty Organization fellowships and P.C.H. was supported by a grant from the U.S. Department of Energy CO2 Research Division No. DE-FG03-86ER60490 to J.F. Reynolds, Systems Ecology Research Group, San Diego State University.
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