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Functional Plant Biology Functional Plant Biology Society
Plant function and evolutionary biology
RESEARCH ARTICLE

Annual variation of the steady-state chlorophyll fluorescence emission of evergreen plants in temperate zone

Julie Soukupová A B F , Ladislav Cséfalvay A B , Otmar Urban C , Martina Košvancová C D , Michal Marek C D , Uwe Rascher E and Ladislav Nedbal A B
+ Author Affiliations
- Author Affiliations

A Laboratory of Physiology and Ecology, Department of Biological Dynamics, Institute of Systems Biology and Ecology of the Academy of Sciences CR, Zámek 136, CZ-37333 Nové Hrady, Czech Republic.

B Department of Systems Biology, Institute of Physical Biology of the University of South Bohemia, Zámek 136, CZ-37333 Nové Hrady, Czech Republic.

C Laboratory of Plants Ecological Physiology, Division of Ecosystem Processes, Institute of Systems Biology and Ecology, Poříčí 3b, CZ-60300 Brno, Czech Republic.

D Department of Forest Ecology, Faculty of Forestry and Wood Technology, Mendel University of Agriculture and Forestry in Brno, Zemědělská 3, CZ-61300 Brno, Czech Republic.

E Institute of Chemistry and Dynamics of the Geosphere, ICG-3: Phytosphere, Research Centre Jülich, D-52425 Jülich, Germany.

F Corresponding author. Email: soukupova@greentech.cz

Functional Plant Biology 35(1) 63-76 https://doi.org/10.1071/FP07158
Submitted: 22 June 2007  Accepted: 29 November 2007   Published: 25 January 2008

Abstract

Remotely sensed passive chlorophyll fluorescence emission has a potential to become one of the major global-scale reporter signals on vegetation performance and stress. In contrast to the actively probed parameters such as maximal (FM′) or minimal (F0′) emission, the steady-state chlorophyll fluorescence, Chl-FS, (FM′ > Chl-FS > F0′) has not been adequately studied. Using fluorescence imaging of leaves, we explored the modulation of Chl-FS by actinic irradiance and by temperature in laboratory, as well as the changes that occurred in three coniferous and broadleaf plant species grown in field. The experiments revealed that Chl-FS is largely insensitive to the incident irradiance once this is above early morning or late evening levels. The characteristic, pre-noon measured Chl-FS correlated positively with the CO2 assimilation rate when measured in field during the year. It was low and stable in the cold winter months and steeply increased with the spring onset. The high values of the characteristic Chl-FS persisted throughout the vegetation season and rapidly decreased in the fall. The seasonal Chl-FS transitions coincided with the last spring frosts or the first fall frosts that persisted for several consecutive nights. The transitions were marked by an elevated variability of the Chl-FS signal. We propose that the signal variability occurring during the transition periods can be used to detect from satellites the beginning and the end of the photosynthetic activity in evergreen canopies of the temperate zone.

Additional keywords: imaging, overwintering plants, photosynthetic activity, Picea, remote sensing, Rhododendron.


Acknowledgements

This work was supported by contracts numbered AV0Z 60870520 (ISBE ASCR), VaV/640/18/03 (ISBE ASCR), 2B06068 (ISBE ASCR) and MSM 6007665808 (IPB USB). We thank Michal Popík, Václav Šlouf and Silvia Svidenská for their valuable contributions during experiments. Our special thank belongs to Professor Govindjee for the critical reading and comments.


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