Theoretical Considerations when Estimating the Mesophyll Conductance to CO2 Flux by Analysis of the Response of Photosynthesis to CO2 | Zendy

P. C. Harley | Zendy; Francesco Loreto | Zendy; Marco Gomes | Zendy; Thomas D. Sharkey | Zendy

Open Access

Theoretical Considerations when Estimating the Mesophyll Conductance to CO₂ Flux by Analysis of the Response of Photosynthesis to CO₂

Author(s) -

P. C. Harley,

Francesco Loreto,

Marco Gomes,

Thomas D. Sharkey

Publication year - 1992

Publication title -

plant physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.554

H-Index - 312

eISSN - 1532-2548

pISSN - 0032-0889

DOI - 10.1104/pp.98.4.1429

Subject(s) - conductance , photosynthesis , diffusion , stomatal conductance , ideal (ethics) , c4 photosynthesis , sensitivity (control systems) , chemistry , partial pressure , flux (metallurgy) , biological system , botany , analytical chemistry (journal) , physics , biology , thermodynamics , environmental chemistry , oxygen , epistemology , electronic engineering , philosophy , organic chemistry , engineering , condensed matter physics

The conductance for CO(2) diffusion in the mesophyll of leaves can limit photosynthesis. We have studied two methods for determining the mesophyll conductance to CO(2) diffusion in leaves. We generated an ideal set of photosynthesis rates over a range of partial pressures of CO(2) in the stroma and studied the effect of altering the mesophyll diffusion conductance on the measured response of photosynthesis to intercellular CO(2) 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.

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