Effects of temperature and light induction of CHL a fluorescence in situ: An ecophysiological view

Abstract

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 whether this impact is due to individual or complementary mechanisms of PAR and/or temperature affecting photosynthetic 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

Elevational distribution and photosynthetic characteristics of the invasive tree Spathodea campanulata on the island of Tahiti (South Pacific Ocean)

“…In contrast, in the elevation range of 541-940 m Chl fluorescence Fo' was significantly higher, potentially indicating unhealthy plants (Percival 2005, Nikolić et al 2008 while ETR max was low suggesting drought stress (Li et al 2008). These results are supported by the significant decrease of Y(II)effective observed at this range showing that photochemical conversion decreases at 541-940 m compared to low elevation.…”

“…Chl fluorescence Fo' is inversely correlated to photosynthetic efficiency (Bité et al 2007), thus providing information about plant health (e.g. Percival 2005, Nikolić et al 2008); 2. Maximum electron transport rate (ETR max ) reflects maximum flow of electrons, a measure of how quickly electrons can move through the photosystem (Bité et al 2007).…”