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Plant and Cell Physiology, 1978, Vol. 19, No. 3 355-363
© 1978

Article

Break points in Arrhenius plots of the Hill reaction of spinach chloroplast fragments in the temperature range from –25 to 25°C

Hiroshi Inoué

Department of Biology, Faculty of Science, Toyama University Toyama 930, Japan

The relationship between temperature and 2,6-dichlorophenolindophenol (DPIP) photoreduction activity in chloroplast fragments isolated from spinach grown at different temperatures was investigated in the temperature range from –25 to 25°C.

Two break points in the slope of the Arrhenius plot of the Hill reaction were observed at –9 and 11°C in chloroplast fragments isolated from spinach grown at low temperatures (0–10°C). These breaks were not affected by an uncoupler. In chloroplast fragments from spinach grown in a higher temperature range (10–30°C), only one break point was observed at –9°C. The other break point at around 10°C appeared after treatment with detergent. Both break points were completely abolished by fixing the chloroplast fragments with glutaraldehyde.

The break at around 10°C in chloroplast fragments isolated from spinach grown at lower temperature was interpreted as due to acclimation rather than chilling sensitivity.

(Received September 6, 1977; )
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