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Plant and Cell Physiology Advance Access originally published online on January 19, 2005
Plant and Cell Physiology 2005 46(1):250-255; doi:10.1093/pcp/pci020
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© 2005 Oxford University Press

Short Communication

Characterization of a member of the AN subfamily, IAN, from Ipomoea nil

Kiu-Hyung Cho1,5, Takayuki Shindo2, Gyung-Tae Kim1,5, Eiji Nitasaka2 and Hirokazu Tsukaya1,3,4,6

1 Okazaki Institute for Integrative Bioscience/ National Institute for Basic Biology, 38 Nishigounaka, Myodaiji-cho, Okazaki, 444-8585 Japan
2 Department of Biological Science, Graduate School of Science, Kyushu University, Hakozaki, Fukuoka, 812-8581 Japan
3 Graduate University for Advanced Studies, Shonan Village, Hayama, Kanagawa 240-0193, Japan
4 Graduate School of Science, Kyoto University, Kyoto, 606-8502 Japan

ANGUSTIFOLIA (AN) is the first C-terminal binding protein (CtBP) gene from plants and controls leaf width and pattern of trichome branching in Arabidopsis thaliana (L.) Heynh. We characterized an ortholog of AN from Ipomoea nil (L.) Roth (Japanese morning glory) and designated it Ipomoea nil’s AN (IAN). IAN is a single-copy gene in the genome and is expressed ubiquitously in various organs of I. nil. IAN contains not only a D2-HDH motif, which is highly conserved within the CtBP family, but also LXCXE, NLS and PEST motifs, which are specific to the AN subfamily. The expression of IAN cDNA driven by the cauliflower mosaic virus 35S promoter restored a defect in leaf expansion in the leaf width direction in the angustifolia-1 (an-1) mutant of Arabidopsis, suggesting that IAN retains a common function with AN. In contrast, the complementation by IAN of a defect in the trichome branching pattern on the leaf surface of the an-1 mutant was less effective than that observed for leaf shape. These results suggest that the mechanisms by which AN regulates leaf width and trichome branching are separable.

5 Present address: Faculty of Natural Resources and Life Sciences, Dong-A University, 840 Hadan-2-dong, Saha-gu, Pusan 604-714, Korea.

6 Corresponding author: E-mail, tsukaya{at}nibb.ac.jp; Fax, +81-564-55-7512.

(Received August 5, 2004; Accepted November 10, 2004)


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