title: Heat stress-induced effects of photosystem I: an overview of structural and functional responses.
abstract: Temperature is one of the main factors controlling the formation, development, and functional performance of the photosynthetic apparatus in all photoautotrophs (green plants, algae, and cyanobacteria) on Earth. The projected climate change scenarios predict increases in air temperature across Earth's biomes ranging from moderate (3-4 °C) to extreme (6-8 °C) by the year 2100 (IPCC in Climate change 2007: The physical science basis: summery for policymakers, IPCC WG1 Fourth Assessment Report 2007; Climate change 2014: Mitigation of Climate Change, IPCC WG3 Fifth Assessment Report 2014). In some areas, especially of the Northern hemisphere, even more extreme warm seasonal temperatures may occur, which possibly will cause significant negative effects on the development, growth, and yield of important agricultural crops. It is well documented that high temperatures can cause direct damages of the photosynthetic apparatus and photosystem II (PSII) is generally considered to be the primary target of heat-induced inactivation of photosynthesis. However, since photosystem I (PSI) is considered to determine the global amount of enthalpy in living systems (Nelson in Biochim Biophys Acta 1807:856-863, 2011; Photosynth Res 116:145-151, 2013), the effects of elevated temperatures on PSI might be of vital importance for regulating the photosynthetic response of all photoautotrophs in the changing environment. In this review, we summarize the experimental data that demonstrate the critical impact of heat-induced alterations on the structure, composition, and functional performance of PSI and their significant implications on photosynthesis under future climate change scenarios.
authors.affiliation: Department of Biology, University of Western Ontario, 1151 Richmond Street N., London, ON, N6A 5B7, Canada. aivanov@uwo.ca.|Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Bl. 21, 1113, Sofia, Bulgaria. aivanov@uwo.ca.
authors.forename: Alexander G
authors.initials: AG
authors.lastname: Ivanov
authors.affiliation: Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Bl. 21, 1113, Sofia, Bulgaria.
authors.forename: Maya Y
authors.initials: MY
authors.lastname: Velitchkova
authors.affiliation: Institute of Plant Physiology, Russian Academy of Sciences, Botanicheskaya Street 35, Moscow, 127276, Russia.|Institute of Basic Biological Problems, Russian Academy of Sciences, Pushchino, Moscow, 142290, Russia.|Department of Plant Physiology, Faculty of Biology, M.V. Lomonosov Moscow State University, Moscow, 119991, Russia.|Institute of Molecular Biology and Biotechnology, Azerbaijan National Academy of Sciences, Matbuat Avenue 2a, 1073, Baku, Azerbaijan.
authors.forename: Suleyman I
authors.initials: SI
authors.lastname: Allakhverdiev
authors.affiliation: Department of Biology, University of Western Ontario, 1151 Richmond Street N., London, ON, N6A 5B7, Canada.
authors.forename: Norman P A
authors.initials: NPA
authors.lastname: Huner
mesh_terms: D002736:Chloroplasts / Q000378:metabolism / Q000648:ultrastructure; D018869:Heat-Shock Response; D008954:Models, Biological; D045331:Photosystem I Protein Complex / Q000737:chemistry* / Q000378:metabolism*
chemical_list: D045331:Photosystem I Protein Complex
keywords: Environmental changes; Heat stress; PSI photochemistry; Photosynthetic apparatus; Photosystem I; Thylakoid membranes