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  Bypassing reproductive barriers in hybrid seeds using chemically induced epimutagenesis

Huc, J., Dziasek, K., Pachamuthu, K., Woh, T., Köhler, C., & Borges, F. (2022). Bypassing reproductive barriers in hybrid seeds using chemically induced epimutagenesis. The Plant Cell, 34(3), 989-1001. doi:10.1093/plcell/koab284.

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 Creators:
Huc, Jonathan1, Author
Dziasek, Katarzyna1, Author
Pachamuthu, Kannan1, Author
Woh, Tristan1, Author
Köhler, C.2, Author              
Borges, Filipe1, Author
Affiliations:
1external, ou_persistent22              
2Epigenetic Mechanisms of Plant Reproduction, Department Köhler, Max Planck Institute of Molecular Plant Physiology, Max Planck Society, ou_3282043              

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 Abstract: The triploid block, which prevents interploidy hybridizations in flowering plants, is characterized by a failure in endosperm development, arrest in embryogenesis, and seed collapse. Many genetic components of triploid seed lethality have been successfully identified in the model plant Arabidopsis thaliana, most notably the paternally expressed imprinted genes (PEGs), which are up-regulated in tetraploid endosperm with paternal excess. Previous studies have shown that the paternal epigenome is a key determinant of the triploid block response, as the loss of DNA methylation in diploid pollen suppresses the triploid block almost completely. Here, we demonstrate that triploid seed collapse is bypassed in Arabidopsis plants treated with the DNA methyltransferase inhibitor 5-Azacytidine during seed germination and early growth. We identified strong suppressor lines showing stable transgenerational inheritance of hypomethylation in the CG context, as well as normalized expression of PEGs in triploid seeds. Importantly, differentially methylated loci segregate in the progeny of "epimutagenized" plants, which may allow epialleles involved in the triploid block response to be identified in future studies. Finally, we demonstrate that chemically induced epimutagenesis facilitates hybridization between different Capsella species, thus potentially emerging as a strategy for producing triploids and interspecific hybrids with high agronomic interest.

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Language(s): eng - English
 Dates: 2021-11-182022-04-03
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1093/plcell/koab284
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Title: The Plant Cell
  Abbreviation : Plant C
Source Genre: Journal
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Publ. Info: Rockville : American Society of Plant Physiologists
Pages: - Volume / Issue: 34 (3) Sequence Number: - Start / End Page: 989 - 1001 Identifier: ISSN: 1532-298X
CoNE: https://pure.mpg.de/cone/journals/resource/1532-298X