Abstract
Temperature dependent changes in maximal variable chlorophyll fluorescence were determined between 30°C and 0°C in cucumber and tomato leaf discs. In both species two abrupt changes occurred in the maximal variable chlorophyll fluorescence plotted against temperature. Cucumber showed breaks around 20°C and 9°C and tomato around 24°C and 15°C. In the presence of DCMU, which blocks electron transport, the low temperature breakpoint disappeared; the maximal variable fluorescence decreased at temperatures below the high temperature breakpoint in tomato leaf discs but not in cucumber leaf discs. The causes of the temperature dependent abrupt changes in variable fluorescence and practical application of the breakpoint temperature as a screening method for the ability of plants to adapt to suboptimal temperature are discussed.
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