Abstract
Changes in the rates of photosynthesis and dark respiration induced by cold pretreatment (2°C) of winter rape plants were investigated.
At the begining of cold pretreatment (one to four days] photosynthesis as well as dark respiration readily responded to changes in the ambient temperature. Prolongation of plant exposure to cold brought about not only depression of photosynthesis but also reduction of the photosynthetic response to changes in temperature and light conditions. On the contrary, prolonged cold pretreatment slightly affected the sensitivity of dark respiration to temperature. In cold-pretreated plants the rate of dark respiration was higher than in the untreated ones at every temperature at which the measurements were carried out.
To obtain full reversion of cold-induced changes in photosynthesis and dark respiration rates caused by prolonged (6, 8 or 14 days) cold pretreatment it was necessary to expose plants for 3–7 days to higher (25°C) temperature.
It seems that low temperature brings about two types of effects concerning photosynthesis and respiration: a direct response of photosynthesis and respiration and an indirect one, which may depend on the coldinduced modifications in physical and metabolic properties of chloroplasts and mitochondria.
This work was supported by Grant No. FG-Po/310 from the USDA, Agricultural Research Program, Public Law 480.
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© 1983 Martinus Nijhoff/Dr W. Junk Publishers, The Hague
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Maciejewska, U., Tomczyk, J., Kacperska, A. (1983). Effects of Cold on CO2 Exchange in Winter Rape Leaves. In: Marcelle, R., Clijsters, H., van Poucke, M. (eds) Effects of Stress on Photosynthesis. Advances in Agricultural Biotechnology, vol 3. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-6813-4_30
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DOI: https://doi.org/10.1007/978-94-009-6813-4_30
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