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First published online October 26, 2007
doi: 10.1242/10.1242/dev.007310

Development 134, 4107-4117 (2007)
Published by The Company of Biologists 2007
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Arabidopsis GLAUCE promotes fertilization-independent endosperm development and expression of paternally inherited alleles

Quy A. Ngo1, James M. Moore2,3, Ramamurthy Baskar2,3, Ueli Grossniklaus2,3 and Venkatesan Sundaresan1,4,*

1 Section of Plant Biology, University of California, One Shields Avenue, Davis, CA 95616, USA.
2 Cold Spring Harbor Laboratory, 1 Bungtown Road, Cold Spring Harbor, NY 11724, USA.
3 Institute of Plant Biology and Zürich-Basel Plant Science Center, University of Zürich, Zollikerstrasse 107, CH-8008 Zürich, Switzerland.
4 Department of Plant Sciences, University of California, One Shields Avenue, Davis, CA 95616, USA.

* Author for correspondence (e-mail: sundar{at}ucdavis.edu)

Accepted 27 August 2007

Early seed development of sexually reproducing plants requires both maternal and paternal genomes but is prominently maternally influenced. A novel gametophytic maternal-effect mutant defective in early embryo and endosperm development, glauce (glc), has been isolated from a population of Arabidopsis Ds transposon insertion lines. The glc mutation results from a deletion at the Ds insertion site, and the molecular identity of GLC is not known. glc embryos can develop up to the globular stage in the absence of endosperm and glc central cells appear to be unfertilized. glc suppresses autonomous endosperm development observed in the fertilization-independent seed (fis) class mutants. glc is also epistatic to mea, one of the fis class mutants, in fertilized seeds, and is essential for the biparental embryonic expression of PHE1, a repressed downstream target of MEA. In addition, maternal GLC function is required for the paternal embryonic expression of the ribosome protein gene RPS5a and the AMP deaminase gene FAC1, both of which are essential for early embryo and endosperm development. These results indicate that factors derived from the female gametophyte activate a subset of the paternal genome of fertilized seeds.

Key words: Embryogenesis, Autonomous endosperm, Maternal effect, Paternal allele activation, Fertilization, Plant reproduction, Seed development




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[Abstract] [Full Text] [PDF]


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