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Plant and Cell Physiology, 2001, Vol. 42, No. 8 868-872
© 2001 Oxford University Press

Inhibition of the Light-Independent Synthesis of Chlorophyll in Pine Cotyledons at Low Temperature

Shinya Muramatsu ,1,2,4, Katsumi Kojima3, Tomohiro Igasaki1, Yoshitaka Azumi2 and Kenji Shinohara ,1,5

1 Department of Molecular and Cell Biology, Forestry and Forest Products Research Institute, Ibaraki, 305-8687 Japan 2 Department of Biological Sciences, Faculty of Science, Kanagawa University, Kanagawa, 259-1293 Japan 3 Asian Natural Environmental Science Center, University of Tokyo, Tokyo, 113-8657 Japan

Cotyledons of Japanese black pine (Pinus thunbergii) were yellow when they developed in darkness at 8°C since the light-independent synthesis of chlorophyll was almost completely inhibited in these cotyledons. The level of chlorophyll in dark-grown cotyledons was less than one-twentieth of that in light-grown cotyledons at the same temperature. In the yellow cotyledons, levels of transcripts of cab, rbcS, rbcL and psbA genes were quite high. The large and small subunits of ribulose-1,5-bisphosphate carboxylase/oxygenase were also detected at relatively high levels in yellow cotyledons. However, the accumulation of the two apoproteins of the light-harvesting chlorophyll a/b-binding protein of PSII was limited because of the limited supply of chlorophyll.

4 Present address: Faculty of Agriculture, University of Shizuoka, Shizuoka, 422-8529 Japan.

5 Corresponding author: E-mail, kenjis@ffpri.affrc.go.jp; Fax, +81-298-73-0507; Phone, +81-298-73-3211(ext.448).


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