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Nikolic B.,Institute of Plant Protection and the Environment | Dodig D.,Maize Research Institute Zemun Polje | Jovanovic V.,Serbian Institute of Pesticides and Environmental Protection | Oro V.,Institute of Plant Protection and the Environment | Markovic A.,University of Kragujevac
Botanica Serbica | Year: 2013

The phenomenon of a midday decrease in quantum and all other efficiencies of photosynthesis has been acknowledged. Quantum efficiency of PSII in nettle is known to be lower at midday than in the morning or evening. On other hand, the parameters of induction of Chla fluorescence in stinging nettle (Urtica dioica L.) during the daytime were shown to depend on temperature alone. An increase in temperature also slowed down processes in reaction centres (RCs) and on the acceptor side of PSII, which showed its effect on electron transport in PSII and overall photosynthesis. A similar situation was found for red currant (Ribes spp.). The temperature effect was considered to be transient thermal inhibition of photosynthesis caused by diurnal changes in temperature. © 2013 Institute of Botany and Botanical Garden Jevremovac, Belgrade. Source

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