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Updated: Jul 11, 2026

Efficient and Rapid Isolation of Early-stage Embryos from Arabidopsis thaliana Seeds
Published on: June 7, 2013
Polycomb group proteins function in the female gametophyte to determine seed development in plants
Olivier Leroy1, Lars Hennig, Holger Breuninger
1Institute of Plant Sciences and Zürich-Base Plant Science Center, Swiss Federal Institute of Technology, ETH Centre, CH-8092 Zürich, Switzerland.
Fertilization Independent Seed (FIS) complex mutations in Arabidopsis cause seed abortion due to maternal imprinting. However, MSI1, an FIS subunit, is not imprinted, and its expression in the female gametophyte is crucial for seed development.
Area of Science:
- Plant reproductive biology
- Epigenetics
- Molecular genetics
Background:
- Polycomb group (PcG) proteins maintain transcriptional patterns across cell generations.
- The plant FERTILIZATION INDEPENDENT SEED (FIS) complex, similar to animal Polycomb repressive complex 2, is vital for seed development.
- Mutations in FIS genes lead to parent-of-origin-dependent seed abortion, with maternal mutant alleles causing failure.
Purpose of the Study:
- To investigate if the parent-of-origin-dependent seed abortion in Arabidopsis caused by the lack of the FIS subunit MSI1 is due to parental imprinting of the MSI1 gene.
- To determine the role of MSI1 expression in different parental contributions to seed development.
Main Methods:
- Genetic analysis of Arabidopsis mutants.
- Testing for parental imprinting of the MSI1 gene.
- Assessing the rescue effects of paternal versus maternal MSI1 expression in mutant seeds.
Main Results:
- MSI1 is not a parentally imprinted gene in Arabidopsis.
- Early paternal expression of MSI1 cannot rescue msi1 mutant seeds.
- Expression of MSI1 within the female gametophyte is essential for normal seed development in msi1 mutants.
Conclusions:
- The seed abortion phenotype of fis mutants is not caused by MSI1 imprinting but by a functional requirement for the FIS complex in the female gametophyte.
- FIS-mediated gene expression patterns established in the female gametophyte are critical for subsequent seed development.
- FIS mutants are confirmed as female gametophytic maternal-effect mutants.
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