caa a22 4500 605480672 CHVBK 20210128100416.0 cr unu---uuuuu 210128e20150901xx s 000 0 eng 10.1007/s11099-015-0115-4 doi (NATIONALLICENCE)springer-10.1007/s11099-015-0115-4 Daily temperature drop prevents inhibition of photosynthesis in tomato plants under continuous light [Elektronische Daten] [E. Ikkonen, T. Shibaeva, E. Rosenqvist, C. Ottosen] The negative effects of continuous light (CL) seen in tomato plants are often claimed to be linked to effects of offsetting the diurnal rhythm. In this study we tested whether a short-term daily temperature drop prevents the decreased photosynthetic performance seen in tomato plants grown under CL. Tomato (Lycopersicon esculentum Mill.) plantlets were grown at constant temperature of 26°C under 16-h day (16D) or 24-h day (24D) at 150 μmol m−2 s−1 PPFD. Some 24D plants were treated daily by 2 h temperature drop from 26 to 10°C (24D+DROP). Physiological disorder, such as severe leaf chlorosis, a large decrease in net photosynthetic rate, maximal quantum yield of PSII photochemistry, and the effective quantum yield of PSII photochemistry were observed in 24D, but not in 16D and 24D+DROP plants. The daily 2-h drop in temperature eliminated a negative effect of CL on photosynthesis and prevented the development of leaf chlorosis in tomato plants. This could be due to a change in carbohydrate metabolism as the short drop in temperature might allow maintenance of the diurnal rhythms. The Institute of Experimental Botany, 2015 chlorophyll fluorescence nationallicence gas exchange nationallicence leaf area nationallicence photodamage nationallicence stomatal conductance nationallicence C a : ambient CO2 concentration nationallicence C i : intercellular CO2 concentration nationallicence Chl : chlorophyll nationallicence CL : continuous light nationallicence DM : dry mass nationallicence DROP : daily short-term temperature decrease nationallicence F0 : minimal fluorescence yield of the dark-adapted state nationallicence Fm : maximal fluorescence yield of the dark-adapted state nationallicence Fm′ : maximal fluorescence yield of the light-adapted state nationallicence Fv : variable fluorescence nationallicence Fv/Fm : maximal quantum yield of PSII photochemistry nationallicence g s : stomatal conductance nationallicence LA : leaf area nationallicence P N : net photosynthetic rate nationallicence R D : dark respiration rate nationallicence α : apparent quantum yield of photosynthesis nationallicence ΦPSII : effective quantum yield of PSII photochemistry nationallicence Ikkonen E. Institute of Biology, Karelian Research Centre, Russian Academy of Sciences, Pushkinskaya 11, 185910, Petrozavodsk, Russia aut Shibaeva T. Institute of Biology, Karelian Research Centre, Russian Academy of Sciences, Pushkinskaya 11, 185910, Petrozavodsk, Russia aut Rosenqvist E. Department of Plant and Environmental Sciences, University of Copenhagen, Hoejbakkegaard Alle 9, DK-2630, Taastrup, Denmark aut Ottosen C. Department of Food Science, Aarhus University, Kirstinebjergvej 10, 5792, Årslev, Denmark aut Photosynthetica The Institute of Experimental Biology of the Czech Academy of Sciences 53/3(2015-09-01), 389-394 0300-3604 53:3<389 2015 53 11099 https://doi.org/10.1007/s11099-015-0115-4 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s11099-015-0115-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ikkonen E. Institute of Biology, Karelian Research Centre, Russian Academy of Sciences, Pushkinskaya 11, 185910, Petrozavodsk, Russia aut NATIONALLICENCE 700 1- Shibaeva T. Institute of Biology, Karelian Research Centre, Russian Academy of Sciences, Pushkinskaya 11, 185910, Petrozavodsk, Russia aut NATIONALLICENCE 700 1- Rosenqvist E. Department of Plant and Environmental Sciences, University of Copenhagen, Hoejbakkegaard Alle 9, DK-2630, Taastrup, Denmark aut NATIONALLICENCE 700 1- Ottosen C. Department of Food Science, Aarhus University, Kirstinebjergvej 10, 5792, Årslev, Denmark aut NATIONALLICENCE 773 0- Photosynthetica The Institute of Experimental Biology of the Czech Academy of Sciences 53/3(2015-09-01), 389-394 0300-3604 53:3<389 2015 53 11099