The influence of annual changes in temperature and light (PAR) on the induction of Chla fluorescence in situ in Stellaria media (L.) and Plantago maior (L.) | Uticaj godisnjih promena temperature i svetlosti (PAR) na indukciju fluorescencije Chla in situ kod Stellaria media (L.) i Plantago maior (L.)
2008
Nikolic, B., Institut za zastitu bilja i zivotnu sredinu, Beograd (Serbia) | Dodig, D., Institut za kukuruz Zemun Polje, Beograd - Zemun (Serbia) | Jovanovic, V., Institut za pesticide i zastitu zivotne sredine, Beograd (Serbia) | Janjic, V., Institut za pesticide i zastitu zivotne sredine, Beograd (Serbia) | Milicevic, Z., Institut za zastitu bilja i zivotnu sredinu, Beograd (Serbia)
In this article, we examined the effect of annual changes in temperature and PAR on the parameters of Chla fluorescence in Stellaria media, a plant species more frequent in colder periods of the year and Plantago maior, which is more frequent in warmer periods. Lower PAR and temperature slowed down the electron transport in PS2, but lower temperatures reduced the quantum efficacy of PS2 and improved processes in the antennae system and the size of plastoquinone pool of PS2 in Stellaria media. Lower temperatures reduced quantum efficacy and slower down the electron transport in PS2 in Plantago maior. The facts that PAR (as well as temparature) affects photosynthesis, and that lower temperatures activate process in the antennae system and those on the acceptor side of PS2 as a counterbalance to the inhibition of quantum efficacy and electron transport in PS2, caused by low temparatures, point at possible explanations of low-temperature resistance of photosynthesis in Stellaria media. On the other hand, low temperatures caused inhibition of quantum efficacy and electron transport in the PS2 of Plantago maior, which caused low-temperature photo-inhibition and stepped quenching of all physiological processes in the species. This might be the reason for the different levels of acclimation to low temperatures and different life strategies of the two species living in close vinicity.
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