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Experimental and theoretical study on high temperature induced changes in chlorophyll a fluorescence oscillations in barley leaves upon 2 % CO2

  • Published:
Photosynthetica

Abstract

Oscillations in many of photosynthetic quantities with a period of about 1 min can be routinely measured with higher plant leaves after perturbation of the steady state by sudden change in gas phase. Among all hypotheses suggested so far to explain the oscillations, an effect of ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBPCO) activation status to control the oscillations is highly probable, at least upon high temperature (HT) treatment when in vivo RuBPCO activity controlled by RuBPCO activase (RuBPCO-A) decreases. Therefore, we measured the oscillations in fluorescence signal coming from barley leaves (Hordeum vulgare L. cv. Akcent) after their exposure for various time intervals to different HTs in darkness. We also evaluated steady state fluorescence and CO2 exchange parameters to have an insight to functions of electron transport chain within thylakoid membrane and Calvin cycle before initiation of the oscillations. The changes in period of the oscillations induced by moderate HT (up to 43 °C) best correlated with changes in non-photochemical fluorescence quenching (qN) that in turn correlated with changes in gross photosynthetic rate (P G) and rate of RuBPCO activation (kact). Therefore, we suggest that changes in period of the oscillations caused by moderate HT are mainly controlled by RuBPCO activation status. For more severe HT (45 °C), the oscillations disappeared which was probably caused by an insufficient formation of NADPH by electron transport chain within thylakoid membrane as judged from a decrease in photochemical fluorescence quenching (qP). Suggestions made on the basis of experimental data were verified by theoretical simulations of the oscillations based on a model of Calvin cycle and by means of a control analysis of the model.

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Abbreviations

ADP:

adenosine 5′-diphosphate

ATP:

adenosine 5′-triphosphate

Chl:

chlorophyll

F0 (F0′):

minimal fluorescence for dark (light) adapted state

FBPase:

fructose 1,6-bisphosphate phosphatase

FM (FM′):

maximal fluorescence for dark (light) adapted state

FS :

steady state fluorescence for light adapted state

FV(FV′):

variable fluorescence for dark (light) adapted state

FV/FM :

maximal quantum yield of photosystem 2 photochemistry

GAPDH:

NADP:glyceraldehyde-3-phosphate dehydrogenase

HT:

high temperature

kact :

apparent rate constant of RuBPCO activation

NADP:

nicotinamide adenine dinucleotide phosphate

NADPH:

reduced nicotinamide adenine dinucleotide phosphate

P G :

steady state gross photosynthetic rate

P N :

steady state net photosynthetic rate

PAR:

photosynthetically active radiation

PGA:

3-phosphoglycerate

PGK:

3-phosphoglycerate kinase

Pi :

orthophosphate

PS:

photosystem

qN :

steady state non-photochemical fluorescence quenching

qP :

steady state photochemical fluorescence quenching

R :

dark respiration

RPK:

ribulose-5-phosphate kinase

RuBP:

ribulose-1,5-bisphosphate

RuBPCO:

ribulose-1,5-bisphosphate carboxylase/oxygenase

RuBPCO-A:

ribulose-1,5-bisphosphate carboxylase/oxygenase activase

RuP:

ribulose-5-phosphate

TP:

triosephosphate

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  1. Laboratory of Biophysics, Faculty of Science, Palacký University, tř. Svobody 26, 771 46, Olomouc, Czech Republic

    D. Lazár, R. Kaňa & J. Nauš

  2. TK8-Software, Na Mlynářce 3, 757 01, Valašské Meziříčí, Czech Republic

    T. Klinkovský

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  1. D. Lazár
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Lazár, D., Kaňa, R., Klinkovský, T. et al. Experimental and theoretical study on high temperature induced changes in chlorophyll a fluorescence oscillations in barley leaves upon 2 % CO2 . Photosynthetica 43, 13–27 (2005). https://doi.org/10.1007/s11099-005-3027-x

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