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First published online August 19, 2005; 10.1104/pp.105.060467

Plant Physiology 139:163-173 (2005)
© 2005 American Society of Plant Biologists

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DEVELOPMENT AND HORMONE ACTION

TANMEI/EMB2757 Encodes a WD Repeat Protein Required for Embryo Development in Arabidopsis1

Kazutoshi Yamagishi2, Noriko Nagata3, Kelly Matsudaira Yee4, Siobhan A. Braybrook, Julie Pelletier, Shozo Fujioka, Shigeo Yoshida, Robert L. Fischer, Robert B. Goldberg and John J. Harada*

Section of Plant Biology, College of Biological Sciences, University of California, Davis, California 95616 (K.Y., K.M.Y., S.A.B., J.P., J.J.H); Plant Functions Laboratory and Plant Science Center, The Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351–0198, Japan (K.Y., N.N., S.F., S.Y.); Department of Plant and Microbial Biology, University of California, Berkeley, California 94720 (R.L.F.); and Department of Molecular, Cell, and Developmental Biology, University of California, Los Angeles, California 90024 (R.B.G.)

We identified the Arabidopsis (Arabidopsis thaliana) tanmei/emb2757 (tan) mutation that causes defects in both embryo and seedling development. tan mutant embryos share many characteristics with the leafy cotyledon (lec) class of mutants in that they accumulate anthocyanin, are intolerant of desiccation, form trichomes on cotyledons, and have reduced accumulation of storage proteins and lipids. Thus, TAN functions both in the early and late phases of embryo development. Moreover, the TAN and LEC genes interact synergistically, suggesting that they do not act in series in the same genetic pathway but, rather, that they have overlapping roles during embryogenesis. tan mutants die as embryos, but immature mutant seeds can be germinated in culture. However, tan mutant seedlings are defective in shoot and root development, their hypocotyls fail to elongate in the dark, and they die as seedlings. We isolated the TAN gene and showed that the predicted polypeptide has seven WD repeat motifs, suggesting that TAN forms complexes with other proteins. Together, these results suggest that TAN interacts with other proteins to control many aspects of embryo development.

1 This work was supported in part by research fellowships from the Japan Society for the Promotion of Science and the Special Postdoctoral Researchers Program of RIKEN (to K.Y.) and by grants from the Department of Energy and the National Science Foundation (to J.J.H.).

2 Present address: Cell Dynamics Research Group, Research Institute for Cell Engineering, National Institute of Advanced Industrial Science and Technology (AIST), 1–8–31 Midorigaoka, Ikeda, Osaka 563–8577, Japan.

3 Present address: Department of Chemical Biological Sciences, Faculty of Science, Japan Women's University, 2–8–1, Mejirodai, Bunkyo-ku, Tokyo 112–8681, Japan.

4 Present address: Reeve-Irvine Research Center, University of California, Irvine, CA 92697.

Article, publication date, and citation information can be found at www.plantphysiol.org/cgi/doi/10.1104/pp.105.060467.

* Corresponding author; e-mail jjharada{at}ucdavis.edu; fax 530–752–5410.

Received February 9, 2005; returned for revision May 17, 2005; accepted May 31, 2005.




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