First published online February 24, 2002; 10.1104/pp.010919
Plant Physiol, March 2002, Vol. 128, pp. 1087-1097
Temperature Acclimation of Photosynthesis and Related Changes
in Photosystem II Electron Transport in Winter
Wheat1
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.)
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.
1
This work was supported in part by the Ministry
of Education, Science, Sport and Culture of Japan (grant no. 11440238 to K.S.).
*
Corresponding author; e-mail yamasan{at}bio.sci.toho-u.ac.jp; fax
81-47-472-5362.
© 2002 American Society of Plant Physiologists
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