caa a22 4500 47710018X CHVBK 20180405111538.0 cr unu---uuuuu 170330e19961101xx s 000 0 eng 10.1007/BF00200296 doi (NATIONALLICENCE)springer-10.1007/BF00200296 Cold acclimation and photoinhibition of photosynthesis in Scots pine [Elektronische Daten] [Alla Krivosheeva, Da-Li Tao, Christina Ottander, Gunnar Wingsle, Sylvain Dube, Gunnar Öquist] Cold acclimation of Scots pine did not affect the susceptibility of photosynthesis to photoinhibition. Cold acclimation did however cause a suppression of the rate of CO2 uptake, and at given light and temperature conditions a larger fraction of the photosystem II reaction centres were closed in cold-acclimated than in nonacclimated pine. Therefore, when assayed at the level of photosystem II reaction centres, i.e. in relation to the degree of photosystem closure, cold acclimation caused a significant increase in resistance to photoinhibition; at given levels of photosystem II closure the resistance to photoinhibition was higher after cold acclimation. This was particularly evident in measurements at 20° C. The amounts and activities of the majority of analyzed active oxygen scavengers were higher after cold acclimation. We suggest that this increase in protective enzymes and compounds, particularly Superoxide dismutase, ascorbate peroxidase, glutathione reductase and ascorbate of the chloroplasts, enables Scots pine to avoid excessive photoinhibition of photosynthesis despite partial suppression of photosynthesis upon cold acclimation. An increased capacity for light-induced de-epoxidation of violaxanthin to zeaxanthin upon cold acclimation may also be of significance. Springer-Verlag, 1996 Frost hardening nationallicence Low temperature nationallicence Photoinhibition nationallicence Photosystem II nationallicence Pinus nationallicence Scavenging nationallicence APX : ascorbate peroxidase nationallicence DHA : dehydroascorbate nationallicence DHAR : dehydroascorbate reductase nationallicence Fm : maximal fluorescence when all reaction centres are closed nationallicence Fv/Fm : maximum photochemical yield of PSII nationallicence GR : glutathione reductase nationallicence GSH : reduced glutathione nationallicence Je : rate of photosynthetic electron transport nationallicence MDAR : monodehydroascorbate reductase nationallicence qN : nonphotochemical quenching of fluorescence nationallicence qP : photochemical quenching of fluorescence nationallicence SOD : superoxide dismutase nationallicence Krivosheeva Alla Department of Biophysics, Ural Forest Technology Institute, 620032, Ekaterinburg, Russia aut Tao Da-Li Institute of Applied Ecology, Academia Sinica, P.O. Box 417, 110015, Shenyang, China aut Ottander Christina Department of Plant Physiology, University of Umeå, S-901 87, Umeå, Sweden aut Wingsle Gunnar Department of Forest Genetics and Plant Physiology, Faculty of Forestry, Swedish University of Agricultural Sciences, S-901 83, Umeå, Sweden aut Dube Sylvain Department of Plant Physiology, University of Lund, S-220 27, Lund, Sweden aut Öquist Gunnar Department of Plant Physiology, University of Umeå, S-901 87, Umeå, Sweden aut Planta Springer-Verlag 200/3(1996-11-01), 296-305 0032-0935 200:3<296 1996 200 425 https://doi.org/10.1007/BF00200296 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00200296 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Krivosheeva Alla Department of Biophysics, Ural Forest Technology Institute, 620032, Ekaterinburg, Russia aut NATIONALLICENCE 700 1- Tao Da-Li Institute of Applied Ecology, Academia Sinica, P.O. Box 417, 110015, Shenyang, China aut NATIONALLICENCE 700 1- Ottander Christina Department of Plant Physiology, University of Umeå, S-901 87, Umeå, Sweden aut NATIONALLICENCE 700 1- Wingsle Gunnar Department of Forest Genetics and Plant Physiology, Faculty of Forestry, Swedish University of Agricultural Sciences, S-901 83, Umeå, Sweden aut NATIONALLICENCE 700 1- Dube Sylvain Department of Plant Physiology, University of Lund, S-220 27, Lund, Sweden aut NATIONALLICENCE 700 1- Öquist Gunnar Department of Plant Physiology, University of Umeå, S-901 87, Umeå, Sweden aut NATIONALLICENCE 773 0- Planta Springer-Verlag 200/3(1996-11-01), 296-305 0032-0935 200:3<296 1996 200 425 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer