Abstract
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.
Abbreviations
- Chl:
-
chlorophyll
- Fm′:
-
maximal fluorescence under light exposure
- Fs :
-
steady-state fluorescence
- J :
-
electron flow via PSII
- J c :
-
electron flow associated with carboxylation
- J o :
-
electron flow associated with oxygenation
- J max :
-
maximum electron flow via PSII
- J r :
-
electron flow costing attributable to other reactions, with the exception of carboxylative and oxygenative reactions
- I sat :
-
saturation irradiance corresponding to P max
- PARsat :
-
saturation irradiance corresponding to J max
- PSII:
-
photosystem II
- P N :
-
net photosynthetic rate
- P max :
-
maximum net photosynthetic rate
- R :
-
day respiration
- R l :
-
photorespiration rate
- R D :
-
dark respiration rate
- α:
-
initial slope of light-response curve of photosynthesis
- θ:
-
initial slope of light-response curve of photosynthetic electron flow via PSII
References
Badger, M.R.: Photosynthetic oxygen exchange. — Annu. Rev Plant Physiol. 36: 27–53, 1985
Cen, Y.P., Turpin, D.H., Layzell, D.B.: Whole-plant gas exchange and reductive biosynthesis in white lupin. — Plant Physiol. 126: 1555–1565, 2001
Cheng, L.L., Fuchigami, L.H., Breen, P.J.: The relationship between photosystem II efficiency and quantum yield for CO2 assimilation is not affected by nitrogen content in apple leaves. — J. Exp. Bot. 52: 1865–1872, 2001
Cornic, G., Briantais, J.M.: Partitioning of photosynthetic electron flow between CO2 and O2 reduction in a C3 leaf (Phaseolus vulgaris L.) at different CO2 concentrations and during drought stress. — Planta 183: 178–184, 1991
Drath, M., Kloft, N., Batschauer, A., Marin, K., Novak, J., Forchhammer, K.: Ammonia triggers photodamage of photosystem II in the cyanobacterium synechocystis sp. strain PCC 6803. — Plant Physiol. 147: 206–215 2008
Eichelmann, H., Oja, V., Peterson, R.B., Laisk, A.: The rate of nitrite reduction in leaves as indicated by O2 and CO2 exchange during photosynthesis. — J. Exp. Bot. 62: 2205–2215, 2011
Epron, D., Godard, D., Cornic, G., Genty, B.: Limitation of net CO2 assimilation rate by internal resistances to CO2 transfer in the leaves of two tree species (Fagus sylvatica L. and Castanea sativa Mill.). — Plant Cell Environ. 18: 43–51, 1995
Ferrier-Pagès, C.E., Tambutté, E., Zamoum, T., Segonds., Merle, P-L., Bensoussan, N., Allemand, D., Garrabou, J., Tambutté, S.: Physiological response of the symbiotic gorgonian Eunicella singularis to a longterm temperature increase. — J. Exp. Biol. 212: 3007–3015, 2009
Fila, G., Badeck, Franz-W., Meyer, S., Corovic, Z., Ghashghaie, J.: Relationships between leaf conductance to CO2 diffusion and photosynthesis in micropropagated grapevine plants, before and after ex vitro acclimatization. — J. Exp. Bot. 57: 2687–2695, 2006
Flexas, J., Barón, M., Bota, J. et al.: Photosynthesis limitations during water stress acclimation and recovery in the droughtadapted Vitis hybrid Richter-110 (V. berlandieri × V. rupestris). — J. Exp. Bot. 60: 2361–2377, 2009
Lee, H.J., Titus, J.S.: Nitrogen accumulation and nitrate reductase activity in MM. 106 apple trees as affected by nitrate supply. — J. Hort. Sci. 67: 273–281, 1992
Li, Y., Gao, Y.X., Xu, X.M., Shen, Q.R., Guo, S.W.: Lightsaturation photosynthesis rate in high-nitrogen rice (Oryza sativa L.) leaves in related to chloroplastic CO2 concentration. — J. Exp. Bot. 60: 2351–2360, 2009
Long, S.P., Bernacchi, C.J.: Gas exchange measurements, what can they tell us about the underlying limitations to photosynthesis? Procedures and sources of error? — J. Exp. Bot. 54: 2393–2401, 2003
Miyake, C.: Alternative electron flows (water-water cycle and cyclic electron flow around PSI) in photosynthesis: Molecular mechanisms and physiological functions. — Plant Cell Physiol. 51: 1951–1963, 2010
Moradi, F., Ismail, A.M.: Responses of photosynthesis, chlorophyll fluorescence and ROS-scavenging systems to salt stress during seedling and reproductive stages in rice. — Ann. Bot. 99: 1161–1173, 2007
Rodolfo-Metalpa, R., Huot, Y., Ferrier-Pagès, C.: Photosynthetic response of the Mediterranean zooxanthellate coral Cladocora caespitosa to the natural range of light and temperature. — J. Exp. Biol. 211: 1579–1586, 2008
Tissue, D.T., Lewis, J.D.: Photosynthetic responses of cottonwood seedlings grown in glacial through future atmospheric [CO2] vary with phosphorus supply. — Tree Physiol. 30: 1361–1372, 2010
Valentini, R,, Epron, D., Angelis P.D.E., Matteucci, G., Dreyer, E.: In situ estimation of net CO2 assimilation, photosynthetic electron flow and photorespiration in Tukey oak (Q. cerris L.) leaves: diurnal cycles under different levels of water supply. — Plant Cell Environ. 18: 631–640, 1995
Werner, T., Holst, K., Pörs, Y., Guivarc’h, A., Mustroph, A., Chriqui, D., Grimm, B., Schmülling, T.: Cytokinin deficiency causes distinct changes of sink and source parameters in tobacco shoots and roots. — J. Exp. Bot. 59: 2659–2672, 2008
White, A.J., Critchley, C.: Rapid light curves: a new fluorescence method to assess the state of the photosynthetic apparatus. — Photosynth. Res. 59: 63–72, 1999
Ye, Z.P., Yu, Q.: A coupled model of stomatal conductance and photosynthesis for winter wheat. — Photosynthetica 46: 637–640, 2008
Author information
Authors and Affiliations
Corresponding author
Additional information
Acknowledgements: The authors are grateful to anonymous referees for valuable comments and helpful suggestions. The authors would like to thank editors for editing the paper and correcting the language. This research was supported by the Natural Science Foundation of China (Grant No. 30960031), the Natural Science Foundation of Jiangxi Province (Grant No. 2009GZN0076) and the Key Discipline of Atomic and Molecular Physics in Jiangxi Province (2011–1015)
Rights and permissions
About this article
Cite this article
Ye, Z.P., Yu, Q. & Kang, H.J. Evaluation of photosynthetic electron flow using simultaneous measurements of gas exchange and chlorophyll fluorescence under photorespiratory conditions. Photosynthetica 50, 472–476 (2012). https://doi.org/10.1007/s11099-012-0051-5
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11099-012-0051-5