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Journal of Plankton Research Vol.22 no.5 pp.865-885, 2000
© Oxford University Press 2000

Effect of photoinhibition on algal photosynthesis: a dynamic model

Bo-Ping Han1,2, Markku Virtanen1, Jorma Koponen1 and Milan Straskraba3,4

1 Environmental Impact Assessment Centre of Finland, Tekniikantie 21B, 02150, Espoo, Finland, 2 Institute of Hydrobiology, Jinan University, Guangzhou, 510632, Peoples Republic of China and 3 Biomathematical Laboratory, Academy of Sciences of the Czech Republic and Faculty of Biological Sciences, University of South Bohemia, Branisovská 31, 37005 C. Budejovice, Czech Republic

4 To whom correspondence should be addressed

Recent evidence from algal physiology and molecular biology confirms that photoinhibition is directly related to D1 protein damage and recovery, and D1 protein damage leads to a decrease in electron transfer or an increase in turnover time of the electron transfer chain. In this study, the turnover time of the electron transfer chain is defined as a function of the relative concentration of D1 protein in reaction centre II and the photoinhibition processes due to D1 protein degradation are incorporated into a model of photosynthesis, initiated by Dubinsky et al. (Plant Cell Physiol., 27, 1335–1349, 1986) and developed by Sakshaug et al. (Limnol. Oceanogr., 34, 198–205, 1989). D1 protein damage is assumed to be both light and D1 protein concentration dependent, and to be proportional to the cross-section of PSII ({sigma}PSII). D1 protein recovery is only D1 protein concentration dependent. Two parameters, the damage constant (kd) and recovery rate (kr), are introduced to formulate the dynamics of D1 protein concentration. Setting minimal turnover time {tau}m = 3 ms, maximal quantum yield {phi}m = 0.1 mol O2 E–1, optical cross-section a* = 0.0075 m2 (mg Chl a)–1, {sigma}PSII = 2 nm2, kd ranging from 0 to 10–7 and kr = 0.55 h–1, the dynamic effect of photoinhibition on photosynthesis in natural conditions is simulated. Simulation results are consistent with observations. Some aspects of photosynthesis associated with photoinhibition, e.g. nutrient limitation and the interaction between photoinhibition and photoadaptation, are investigated through this dynamic model.


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 J PLANKTON RESHome page
R. L. Oliver, J. Whittington, Z. Lorenz, and I. T. Webster
The influence of vertical mixing on the photoinhibition of variable chlorophyll a fluorescence and its inclusion in a model of phytoplankton photosynthesis
J. Plankton Res., September 1, 2003; 25(9): 1107 - 1129.
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