Recovery of photosynthetic capacity in <Emphasis Type="Italic">Vaccinium vitis</Emphasis>-<Emphasis Type="Italic">idaea</Emphasis> during mild spells in winter |
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Authors: | Timo Saarinen Robin Lundell Heikki Hänninen |
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Institution: | (1) Plant Biology, Department of Biosciences, University of Helsinki, P.O. Box 65, Viikinkaari 1, 00014 Helsinki, Finland |
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Abstract: | Recent studies suggest that evergreen plants may maintain their photosynthetic capacity through the winter. Since mild winters
are predicted to be more frequent in the future, the metabolic activity of plants is also likely to increase. The aim of the
present study was to assess how various environmental factors, such as temperature, photoperiod and preceding frost, affect
the recovery of photosynthesis during a mild spell in winter. The recovery of photosynthesis was studied in a series of growth
chamber experiments where the overwintering of lingonberry (Vaccinium vitis-idaea) was interrupted by an intermittent warm spell of 1 week during different phases of winter. Rapid activation was observed
in all the experiments during the first 3–4 days. No obvious effects of the phase of winter or photoperiod on the recovery
of photosynthesis were observed, but a severe freezing treatment prior to the warm spell retarded the recovery significantly.
Once recovered, however, lingonberry was able to maintain high rates of photosynthesis even at near-freezing temperatures,
which prevail in their natural sub-nivean environment. The apparent quantum yield of photosynthesis remained high through
the winter for lingonberry. This may prove advantageous for evergreen dwarf shrubs which overwinter in dim environments under
snow. |
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