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AOBPreview published online on December 19, 2002
Annals of Botany, doi:10.1093/aob/mcg020
© 2002 by Annals of Botany Company
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Submitted on July 3, 2002
Revised on September 24, 2002
Accepted on October 21, 2002

Low Temperature Enhances Photosynthetic Down-regulation in French Bean (Phaseolus vulgaris L.) Plants

TSONKO TSONEV1, VIOLETA VELIKOVA1, KATYA GEORGIEVA1, PAUL F. HYDE2, and HAMLYN G. JONES2*

Affiliation of the authors: 1 Acad. M. Popov Institute of Plant Physiology, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Bl. 21, 1113 Sofia, Bulgaria; 2 Division of Environmental and Applied Biology, Biological Sciences Institute, University of Dundee, Dundee DD1 4HN, UK

* To whom correspondence should be addressed. E-mail: h.g.jones{at}dundee.ac.uk.

The mechanisms of photosynthetic adaptation to different combinations of temperature and irradiance during growth, and especially the consequences of exposure to high light (2000 µmol m-2 s-1 PPFD) for 5 min, simulating natural sunflecks, was studied in bean plants (Phaseolus vulgaris L.). A protocol using only short (3 min) dark pre-treatment was introduced to maximize the amount of replication possible in studies of chlorophyll fluorescence. High light at low temperature (10 °C) significantly down-regulated photosynthetic electron transport capacity [as measured by the efficiency of photosystem II (PSII)], with the protective acclimation allowing the simulated sunflecks to be used more effectively for photosynthesis by plants grown in low light. The greater energy dissipation by thermal processes (lower Fv'/Fm' ratio) at low temperature was related to increased xanthophyll de-epoxidation and to the fact that photosynthetic carbon fixation was more limiting at low than at high temperatures. A key objective was to investigate the role of photorespiration in acclimation to irradiance and temperature by comparing the effect of normal (21 kPa) and low (1·5 kPa) O2 concentrations. Low [O2] decreased Fv/Fm and the efficiency of PSII ({Phi}PSII), related to greater PSII down-regulation in cold pre-treated plants, but minimized further inhibition by the mild ‘sunfleck' treatment used. Results support the hypothesis that photorespiration provides a ‘safety-valve' for excess energy.
Key words: Phaseolus vulgaris L., bean, low temperature, photosynthesis, down-regulation, high light, sunfleck, chlorophyll fluorescence.


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