Photosynthetica 2012, 50(3):472-476 | DOI: 10.1007/s11099-012-0051-5

Evaluation of photosynthetic electron flow using simultaneous measurements of gas exchange and chlorophyll fluorescence under photorespiratory conditions

Z. P. Ye1,4,*, Q. Yu2, H. J. Kang3
1 Research Center for Jinggangshan Eco-Environmental Sciences, Jinggangshan University, Ji'an, P.R. China
2 Plant Functional Biology and Climate Change Cluster, University of Technology, Sydney, Australia
3 Department of Landscape Architecture, Wenzhou Vocational and Technical College, Wenzhou, P.R. China
4 College of Maths and Physics, Jinggangshan University, Ji'an, P.R. China

Simultaneous measurements of leaf gas exchange and chlorophyll fluorescence for Koelreuteria paniculata Laxm. at 380 ± 5.6 and 600 ± 8.5 μmol mol-1 were conducted, and the photosynthetic electron flow via photosystem II (PSII) to photosynthesis, photorespiration, and other electron-consuming processes were calculated. The results showed that the photosynthetic electron flow associated with carboxylation (J c), oxygenation (J o), and other electron-consuming processes (J r) were 72.7, 45.7, and 29.4 μmol(e-) m-2 s-1 at 380 μmol mol-1, respectively; and 86.1, 35.3, and 48.2 μmol(e-) m-2 s-1 at 600 μmol mol-1, respectively. Our results revealed that other aspects associated with electronconsuming processes, except for photosynthesis and respiration, were neither negligible nor constant under photorespiratory conditions. Using maximum net photosynthetic rate (P max), day respiration (R), photorespiration rate (R l), and maximum electron flow via PSII (J max), the use efficiency of electrons via PSII at saturation irradiance to fix CO2 was calculated. The calculated results showed that the use efficiency of electrons via PSII to fix CO2 at 600 μmol mol-1 was almost as effective as that at 380 μmol mol-1, even though more electrons passed through PSII at 600 μmol mol-1 than at 380 μmol mol-1.

Keywords: light-response curve of photosynthesis; light-response curve of photosynthetic electron flow via PSII; photosynthesis; photosynthetic electron flow via PSII

Received: October 14, 2011; Accepted: May 30, 2012; Published: September 1, 2012Show citation

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Ye, Z.P., Yu, Q., & Kang, H.J. (2012). Evaluation of photosynthetic electron flow using simultaneous measurements of gas exchange and chlorophyll fluorescence under photorespiratory conditions. Photosynthetica, 50(3), 472-476. doi: 10.1007/s11099-012-0051-5.
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