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Plant and Cell Physiology Advance Access published online on February 2, 2005
Plant and Cell Physiology, doi:10.1093/pcp/pci062
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Plant and Cell Physiology 2005 © The Japanese Society of Plant Physiologists (JSPP); all rights reserved.
Received November 12, 2004
Accepted January 21, 2005

Short Communication

The Tomato Photomorphogenetic Mutant, aurea, Is Deficient in Phytochromobilin Synthase for Phytochrome Chromophore Biosynthesis

Takuya Muramoto 1, Chitose Kami 2, Hideo Kataoka 3, Naoko Iwata 2, Philip J. Linley 1, Keiko Mukougawa 4, Akiho Yokota 2, and Takayuki Kohchi 1*

1 Graduate School of Biostudies, Kyoto University, Kitashirakawa-oiwake, Sakyo, Kyoto 606-8502 Japan
2 Graduate School of Biological Sciences, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0192 Japan
3 Department of Applied Life Sciences, Faculty of Agriculture, Kyoto University, Kitashirakawa-oiwake, Sakyo, Kyoto 606-8502 Japan
4 Graduate School of Biostudies, Kyoto University, Kitashirakawa-oiwake, Sakyo, Kyoto 606-8502 Japan; Graduate School of Biological Sciences, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0192 Japan

* To whom correspondence should be addressed.
Takayuki Kohchi, E-mail: tkohchi {at}lif.kyoto-u.ac.jp


  Abstract

The aurea mutants of tomato have been widely used as phytochrome deficient mutants for photomorphogenetic and photobiological studies. By EST-based screening of sequence databases we found a tomato gene that encodes a protein homologous to Arabidopsis HY2 for phytochromobilin synthase catalyzing the last step of phytochrome chromophore biosynthesis. The tomato protein expressed in Escherichia coli showed phytochromobilin synthase activity. The corresponding loci in all aurea mutants tested have nucleotide substitutions, deletions, or DNA rearrangements. These results indicate that aurea is a mutant of phytochromobilin synthase in tomato. We also discuss on a phylogenetic analysis of phytochromobilin synthases in the bilin reductase family.

Keywords: aurea; photomorphogenesis; phytochrome; phytochromobilin.
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