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Proc Natl Acad Sci U S A. 2006 Aug 29;103(35):13244-9. Epub 2006 Aug 21.

Partially redundant functions of two SET-domain polycomb-group proteins in controlling initiation of seed development in Arabidopsis.

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1
Department of Plant Sciences, University of Arizona, Tucson, 85721-0036, USA.

Abstract

In Arabidopsis, a complex of Polycomb-group (PcG) proteins functions in the female gametophyte to control the initiation of seed development. Mutations in the PcG genes, including MEDEA (MEA) and FERTILIZATION-INDEPENDENT SEED 2 (FIS2), produce autonomous seeds where endosperm proliferation occurs in the absence of fertilization. By using a yeast two-hybrid screen, we identified MEA and a related protein, SWINGER (SWN), as SET-domain partners of FIS2. Localization data indicated that all three proteins are present in the female gametophyte. Although single-mutant swn plants did not show any defects, swn mutations enhanced the mea mutant phenotype in producing autonomous seeds. Thus, MEA and SWN perform partially redundant functions in controlling the initiation of endosperm development before fertilization in Arabidopsis.

PMID:
16924116
PMCID:
PMC1559784
DOI:
10.1073/pnas.0605551103
[Indexed for MEDLINE]
Free PMC Article
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