Effects of temperature and light induction of Chl A fluorescence in situ: an ecophysiological view
2008
Nikolic, B., Institute for Plant Protection and Environment, Belgrade (Serbia) | Dodig, D., Maize Research Institute Zemun Polje, Belgrade - Zemun (Serbia) | Jovanovic, V., Institute of Pesticides and Environmental Protection, Belgrade (Serbia) | Janjic, V., Institute of Pesticides and Environmental Protection, Belgrade (Serbia) | Djurovic, S., Institute for Plant Protection and Environment, Belgrade (Serbia)
The effects of PAR and temperature on induction of Chl a fluorescence were observed on leaves of 20 plant species in their natural environments. Light affects the acceptor side of PS2. Temperature regulation of PS2 activity proceeds by affecting the RC and acceptor side of PS2. The impact of higher temperature can be attributed to greater fluidity of the thylakoid membranes. Photosynthetically active radiation and temperature under the given conditions are in highly significant positive correlation, so it is not clear wheater this impact is due to individual or complementary mechanisms of PAR and/or temperature affecting photo-synthetic processes in the thylakoid membranes. Also, it is not clear whether species specificity has any significance in the plant photosynthetic response to changes of PAR and temperature. Changes of PAR and temperature during induction of Chl a fluorescence do not affect Pindex, as a parameter of total photosynthesis.
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