Photosynthetica 2010, 48(3):323-331 | DOI: 10.1007/s11099-010-0042-3

Comparison of parameters estimated from A/Ci and A/Cc curve analysis

W. Zeng1,2, G. S. Zhou1,3,*, B. R. Jia1, Y. L. Jiang1, Y. Wang1,2
1 State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing, China
2 Graduate University of Chinese Academy of Sciences, Beijing, China
3 Chinese Academy of Meteorological Sciences, Beijing, China

The parameters estimated from traditional A/C i curve analysis are dependent upon some underlying assumptions that substomatal CO2 concentration (C i) equals the chloroplast CO2 concentration (C c) and the C i value at which the A/C i curve switches between Rubisco- and electron transport-limited portions of the curve (C i-t) is set to a constant. However, the assumptions reduced the accuracy of parameter estimation significantly without taking the influence of C i-t value and mesophyll conductance (g m) on parameters into account. Based on the analysis of Larix gmelinii's A/C i curves, it showed the C i-t value varied significantly, ranging from 24 Pa to 72 Pa and averaging 38 Pa. t-test demonstrated there were significant differences in parameters respectively estimated from A/C i and A/C c curve analysis (p<0.01). Compared with the maximum ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) carboxylation rate (Vcmax), the maximum electron transport rate (Jmax) and Jmax/Vcmax estimated from A/C c curve analysis which considers the effects of g m limit and simultaneously fits parameters with the whole A/C c curve, mean Vcmax estimated from A/C i curve analysis (Vcmax-C i) was underestimated by 37.49%; mean Jmax estimated from A/C i curve analysis (Jmax-C i) was overestimated by 17.8% and (Jmax-C i)/(Vcmax-C i) was overestimated by 24.2%. However, there was a significant linear relationship between Vcmax estimated from A/C i curve analysis and Vcmax estimated from A/C c curve analysis, so was it Jmax (p<0.05).

Keywords: A, Ci curve analysis; A, Cc curve analysis; mesophyll conductance; parameter estimation; photosynthesis

Received: September 8, 2009; Accepted: May 4, 2010; Published: September 1, 2010Show citation

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Zeng, W., Zhou, G.S., Jia, B.R., Jiang, Y.L., & Wang, Y. (2010). Comparison of parameters estimated from A/Ci and A/Cc curve analysis. Photosynthetica, 48(3), 323-331. doi: 10.1007/s11099-010-0042-3.
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