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Plant and Cell Physiology Advance Access published online on January 19, 2005
Plant and Cell Physiology, doi:10.1093/pcp/pci020
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Plant and Cell Physiology 2005 © The Japanese Society of Plant Physiologists (JSPP); all rights researved.
Received August 5, 2004
Accepted November 10, 2004

Short Communication

Characterization of a Member of the AN Subfamily, IAN, from Ipomoea nil

Kiu-Hyung Cho 1, Takayuki Shindo 2, Gyung-Tae Kim 1, Eiji Nitasaka 2, and Hirokazu Tsukaya 3*

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 Okazaki Institute for Integrative Bioscience/ National Institute for Basic Biology, 38 Nishigounaka, Myodaiji-cho, Okazaki 444-8585, Japan; Graduate University for Advanced Studies, Shonan Village, Hayama, Kanagawa 240-0193, Japan; Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan

* To whom correspondence should be addressed.
Hirokazu Tsukaya, E-mail: tsukaya{at}nibb.ac.jp


  Abstract

ANGUSTIFOLIA (AN) is the first 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 Ipomoea 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. By 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.

Keywords: ANGUSTIFOLIA; Arabidopsis thaliana; IAN; Ipomoea nil; Leaf shape; Trichome.
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