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Published on August 19, 2005; 10.1104/pp.105.060467

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Received February 9, 2005
Returned for revision May 17, 2005
Accepted May 31, 2005

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

Kazutoshi Yamagishi , Noriko Nagata , Kelly Matsudaira Yee , 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; Plant Functions Laboratory and Plant Science Center, The Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-0198, Japan
Plant Functions Laboratory and Plant Science Center, The Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-0198, Japan
Section of Plant Biology, College of Biological Sciences, University of California, Davis, California 95616
Department of Plant and Microbial Biology, University of California, Berkeley, California 94720
Department of Molecular, Cell, and Developmental Biology, University of California, Los Angeles, California 90024

* Corresponding author; email: jjharada{at}ucdavis.edu.

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.




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