Journal Article

Characterization of the <i>Arabidopsis thaliana</i> Mutant <i>pcb2</i> which Accumulates Divinyl Chlorophylls

Hiromitsu Nakanishi, Hatsumi Nozue, Kenji Suzuki, Yasuko Kaneko, Goro Taguchi and Nobuaki Hayashida

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 46, issue 3, pages 467-473
Published in print March 2005 | ISSN: 0032-0781
Published online March 2005 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pci053
Characterization of the Arabidopsis thaliana Mutant pcb2 which Accumulates Divinyl Chlorophylls

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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.

Keywords: Arabidopsis thaliana; Chloroplast; Complementation; Divinyl protochlorophyllide 8-vinyl reductase; Grana stack; pcb2 mutant; CaMV, cauliflower mosaic virus; CAO, chlorophyllide a oxygenase; Col, Columbia; dCAPS, derived cleaved amplified polymorphic sequence; EMS, ethyl methanesulfonate; ESI, electrospray ionization; EST, expressed sequence tag; LC, liquid chromatography; Ler, Landsberg erecta; MS, mass spectrometry; ODS, octadecasilyl; RT–PCR, reverse trascription–polymerase chain reaction; SSLP, simple sequence length polymorphism

Journal Article.  4839 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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