Plant Physiology Preview
Published on February 24, 2002; 10.1104/pp.010919
Received October 9, 2001
Returned for revision November 8, 2001
Accepted December 11, 2001
Temperature Acclimation of Photosynthesis and Related Changes
in Photosystem II Electron Transport in Winter
Wheat
Takenobu Yamasaki *, Tomokazu Yamakawa , Yoshihiro Yamane , Hiroyuki Koike , Kazuhiko Satoh , and Sakae Katoh
Department of Biology, Faculty of Science, Toho University, Miyama 2--2--1, Funabashi, Chiba 274--8510, Japan (Ta. Y., To. Y., S.K.); and Department of Life Science, Faculty of Science, Himeji Institute of Technology, Harima Science Garden City, Hyogo 678--1297, Japan (Y.Y., H.K., K.S.)
* Corresponding author; email: yamasan{at}bio.sci.toho-u.ac.jp.
Winter wheat (Triticum aestivum L. cv Norin No. 61) was grown at 25°C until the third leaves reached about 10 cm in length and then at 15°C, 25°C, or 35°C until full development of the third leaves (about 1 week at 25°C, but 2--3 weeks at 15°C or 35°C). In the leaves developed at 15°C, 25°C, and 35°C, the optimum temperature for CO2-saturated photosynthesis was 15°C to 20°C, 25°C to 30°C, and 35°C, respectively. The photosystem II (PS II) electron transport, determined either polarographically with isolated thylakoids or by measuring the modulated chlorophyll a fluorescence in leaves, also showed the maximum rate near the temperature at which the leaves had developed. Maximum rates of CO2-saturated photosynthesis and PS II electron transport determined at respective optimum temperatures were the highest in the leaves developed at 25°C and lowest in the leaves developed at 35°C. So were the levels of chlorophyll, photosystem I and PS II, whereas the level of Rubisco decreased with increasing temperature at which the leaves had developed. Kinetic analyses of chlorophyll a fluorescence changes and P700 reduction showed that the temperature dependence of electron transport at the plastoquinone and water-oxidation sites was modulated by the temperature at which the leaves had developed. These results indicate that the major factor that contributes to thermal acclimation of photosynthesis in winter wheat is the plastic response of PS II electron transport to environmental temperature.
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