Journal
PLANT SCIENCE
Volume 196, Issue -, Pages 8-17Publisher
ELSEVIER IRELAND LTD
DOI: 10.1016/j.plantsci.2012.07.005
Keywords
Low night temperature; Photosynthesis; Photoinhibition; Antioxidant system; Recovery; Tomato
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Funding
- National Key Basic Research and Development Plan of China, 973 project [2009CB119000]
- 12th Five-Year Support Project of China [2011BAD12B03]
- Earmarked Fund for China Agriculture Research System [Nycytx-35-gw23]
- Major Scientific Research Projects of Liaoning Province [2011215003]
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The effects of low night temperature (LNT, i.e., 9 and 6 degrees C) stress and rewarming (15 degrees C night temperature) on the photosynthesis, photosystems I and II (PSI and PSII), and antioxidant system of tomato leaves were studied. The results showed that 9 d of LNT treatment led to an irreversible reduction in the photosynthetic rate. This reduction was accompanied by stomatal limitation of CO2 supply and significant decline in ribulose-1,5-bisphosphate carboxylase/oxygenase activity at the transcription level, as well as sucrose accumulation. LNT treatment induced the reversible photoinhibition of PSII, decreased PSII activity, increased the photochemical yield of PSI Y(I), and markedly caused the acceptor side limitation of PSI. This finding was reflected by the higher value of Y(NA) in the treated plants than in the control. At the same time, a downregulation of electron transport for photosynthetic carbon reduction under LNT was mostly compensated by Ja(O-2-dependent) driven by the water-water cycle. Crown Copyright (C) 2012 Published by Elsevier Ireland Ltd. All rights reserved.
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