Photosynthetica 1997, 33(12):265-279 | DOI: 10.1023/A:1006800909651

Rapid and straightforward estimates of photosynthetic characteristics using a portable gas exchange system

R. Parsons1, J.D.B. Weyers1, T. Lawson1, I.M. Godber1
1 Department of Biological Sciences, University of Dundee, Dundee, U.K

Procedures are described for estimating photosynthetic characteristics using a portable infra-red gas analysis (IRGA) system. Once the effects of stomatal limitation on CO2 assimilation have been established, up to ten parameters of photosynthesis can be estimated for a single leaf within 2 h, including: photosynthetic efficiency and capacity on both photon and CO2 bases; compensation irradiances and CO2 compensation concentrations; and light and dark respiration rates. These measurements can be made in the laboratory, glasshouse or field with relative ease. Methods for obtaining near instantaneous ("snapshot") measurements of leaf photosynthesis are also described, using carefully pre-set conditions within the leaf cuvette. Representative results are shown for Phaseolus vulgaris L. Important aspects of the procedure's experimental design, assumptions made in the analysis, and limitations of this approach are analysed.

Prepublished online: January 1, 1998; Published: March 1, 1997  Show citation

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Parsons, R., Weyers, J.D.B., Lawson, T., & Godber, I.M. (1997). Rapid and straightforward estimates of photosynthetic characteristics using a portable gas exchange system. Photosynthetica, 34(2), 265-279. doi: 10.1023/A:1006800909651
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