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Plant and Cell Physiology 2004 45(12):1870-1874; doi:10.1093/pcp/pch203
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© 2004 Oxford University Press

Short Communication

Photosynthetic Characteristics of Rice Leaves Grown under Red Light with or without Supplemental Blue Light

Ryo Matsuda1, Keiko Ohashi-Kaneko, Kazuhiro Fujiwara, Eiji Goto2 and Kenji Kurata

Department of Biological and Environmental Engineering, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-8657 Japan

In rice plants grown under red light supplemented with blue light (red/blue-light PPFD ratio was 4/1), photosynthetic rates per unit leaf area measured under white light at 1,600 and 250 µmol m–2 s–1 were higher than those in the plants grown under red light alone. The higher photosynthetic rates were associated with higher total N content of leaves, which was accompanied by larger amounts of key components of photosynthesis-limiting processes, including Rubisco, Cyt f, Chl and LHCII. These results suggested that the increase in total N content of leaves induced by supplemental blue light enhanced both light-saturated and light-limited photosynthesis.

1 Corresponding author: E-mail, aa47070{at}mail.ecc.u-tokyo.ac.jp; Fax, +81-3-5841-8172.

2 Present address: Department of Bioproduction Science, Faculty of Horticulture, Chiba University, 648 Matsudo, Matsudo, Chiba, 271-8510 Japan.


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