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Plant and Cell Physiology Advance Access originally published online on February 2, 2005
Plant and Cell Physiology 2005 46(3):467-473; doi:10.1093/pcp/pci053
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JSPP © 2005

Characterization of the Arabidopsis thaliana Mutant pcb2 which Accumulates Divinyl Chlorophylls

Hiromitsu Nakanishi1, Hatsumi Nozue1, Kenji Suzuki1, Yasuko Kaneko2, Goro Taguchi1 and Nobuaki Hayashida1,3

1 Division of Gene Research, Department of Life Science, Research Center for Human and Environmental Sciences, Shinshu University, Ueda, 386-8567 Japan
2 Department of Regulation Biology, Faculty of Science, Saitama University, Saitama, 338-8570 Japan

3 Corresponding author: E-mail, nobuaki{at}giptc.shinshu-u.ac.jp; Fax, +81-268-21-5810.

We characterized the pcb2 (pale-green and chlorophyll b reduced 2) mutant. We found through electron microscopic observation that chloroplasts of pcb2 mesophyll cells lacked distinctive grana stacks. High-performance liquid chromatography (HPLC) analysis showed that the pcb2 mutant accumulated divinyl chlorophylls, and the relative amount of divinyl chlorophyll b was remarkably less than that of divinyl chlorophyll a. The responsible gene was mapped in an area of 190 kb length at the upper arm of the 5th chromosome, and comparison of DNA sequences revealed a single nucleotide substitution causing a nonsense mutation in At5g18660. Complementation analysis confirmed that the wild-type of this gene suppressed the phenotypes of the mutation. Antisense transformants of the gene also accumulated divinyl chlorophylls. The genes homologous to At5g18660 are conserved in a broad range of species in the plant kingdom, and have similarity to reductases. Our results suggest that the PCB2 product is divinyl protochlorophyllide 8-vinyl reductase.

Received October 29, 2004; Accepted December 25, 2004
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