Plant Cell Advance Online Publication
Published on October 7, 2005; 10.1105/tpc.105.034603
Received May 27, 2005
Returned for revision August 11, 2005
Accepted September 14, 2005
MYB98 Is Required for Pollen Tube Guidance and Synergid Cell Differentiation in Arabidopsis
Ryushiro D. Kasahara 1, Michael F. Portereiko 1, Linda Sandaklie-Nikolova 1, David S. Rabiger 1, and Gary N. Drews 1*
1 Department of Biology, University of Utah, Salt Lake City, Utah 84112-0840
* To whom correspondence should be addressed. E-mail: drews{at}bioscience.utah.edu.
The synergid cells of the female gametophyte play a role in many steps of the angiosperm fertilization process, including guidance of pollen tube growth to the female gametophyte. However, the mechanisms by which the synergid cells become specified and develop their unique features during female gametophyte development are not understood. We identified MYB98 in a screen for Arabidopsis thaliana genes expressed in the female gametophyte. MYB98 is a member of the R2R3-MYB gene family, the members of which likely encode transcription factors. In the context of the ovule, MYB98 is expressed exclusively in the synergid cells, and mutations in this gene affect the female gametophyte specifically. myb98 female gametophytes are affected in two unique features of the synergid cell, pollen tube guidance and the filiform apparatus, but are otherwise normal. MYB98 also is expressed in trichomes and endosperm. Homozygous myb98 mutants exhibit no sporophytic defects, including trichome and endosperm defects. Together, these data suggest that MYB98 controls the development of specific features within the synergid cell during female gametophyte development.
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