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          Institute: MPI für Entwicklungsbiologie     Collection: Abteilung 5 - Cell Biology (G. Jürgens)     Display Documents



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ID: 708887.0, MPI für Entwicklungsbiologie / Abteilung 5 - Cell Biology (G. Jürgens)
Twin plants from supernumerary egg cells in Arabidopsis
Authors:Kong, J.; Lau, S.; Jurgens, G.
Language:English
Date of Publication (YYYY-MM-DD):2015-01-19
Title of Journal:Current Biology
Journal Abbrev.:Curr Biol
Volume:25
Issue / Number:2
Start Page:225
End Page:230
Sequence Number of Article:25544612
Review Status:Internal review
Audience:Experts Only
Abstract / Description:Sexual reproduction of flowering plants is distinguished by double fertilization-the two sperm cells delivered by a pollen tube fuse with the two gametic cells of the female gametophyte, the egg and the central cell-inside the ovule to give rise to the embryo and the nutritive endosperm, respectively. The pollen tube is attracted by nongametic synergid cells, and how these two cells of the female gametophyte are specified is currently unclear. Here, we show that ALTERED MERISTEM PROGRAM 1 (AMP1), encoding a protein associated with the endoplasmic reticulum, is required for synergid cell fate during Arabidopsis female gametophyte development. Loss of AMP1 function leads to supernumerary egg cells at the expense of synergids, enabling the generation of dizygotic twins. However, if twin embryos are formed, endosperm formation is prevented, eventually resulting in ovule abortion. The latter can be overcome by the delivery of supernumerary sperm cells in tetraspore (tes) pollen, enabling the formation of twin plants. Thus, both primary and supernumerary egg cells are fully functional in amp1 mutant plants. Sporophytic AMP1 expression is sufficient to prevent cell-fate change of synergids, indicating that one or more AMP1-dependent mobile signals from outside the female gametophyte can contribute to its patterning, in addition to the previously reported lateral inhibition between gametophytic cells. Our results provide insight into the mechanism of synergid fate specification and emphasize the importance of specifying only one egg cell within the female gametophyte to ensure central-cell fertilization by the second sperm cell.
External Publication Status:published
Document Type:Article
Communicated by:edocabt5
Affiliations:MPI für Entwicklungsbiologie/Abteilung 5 - Zellbiologie (Gerd Jürgens)
External Affiliations:Department of Cell Biology, Max Planck Institute for Developmental Biology, Spemannstrasse 35, 72076 Tubingen, Germany; Center for Plant Molecular Biology (ZMBP), Developmental Genetics, University of Tubingen, Auf der Morgenstelle 32, 72076 Tubingen, Germany. Electronic address: gerd.juergens@zmbp.uni-tuebingen.de.
Identifiers:ISSN:1879-0445 (Electronic) 0960-9822 (Linking) %R 10.1... [ID No:1]
URL:http://www.ncbi.nlm.nih.gov/pubmed/25544612 [ID No:2]
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