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  The beneficial root-colonizing fungus Mortierella hyalina promotes the aerial growth of Arabidopsis and activates calcium-dependent responses that restrict Alternaria brassicae-induced disease development in roots

Johnson, J. M., Ludwig, A., Furch, A., Mithöfer, A., Scholz, S. S., Reichelt, M., et al. (2019). The beneficial root-colonizing fungus Mortierella hyalina promotes the aerial growth of Arabidopsis and activates calcium-dependent responses that restrict Alternaria brassicae-induced disease development in roots. Molecular Plant-Microbe Interactions, 32(3), 351-363. doi:10.1094/MPMI-05-18-0115-R.

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https://doi.org/10.1094/MPMI-05-18-0115-R (Publisher version)
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 Creators:
Johnson, Joy Michal, Author
Ludwig, Anatoli, Author
Furch, Alexandra, Author
Mithöfer, Axel1, Author              
Scholz, Sandra S.1, Author              
Reichelt, Michael2, Author              
Oelmüller, Ralf, Author
Affiliations:
1Research Group Plant Defense Physiology, Dr. Axel Mithöfer, MPI for Chemical Ecology, Max Planck Society, Jena, DE, ou_3022756              
2Department of Biochemistry, Prof. J. Gershenzon, MPI for Chemical Ecology, Max Planck Society, ou_421893              

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 Abstract: The endophytic fungus Mortierella hyalina colonizes the roots of Arabidopsis thaliana and stimulates growth and biomass production of the aerial parts, but not of roots. An exudate fraction from the fungus induces rapid and transient cytoplasmic Ca2+elevation in the roots. The Ca2+ response does not require the well-characterized (co-)receptors BAK1, CERK1 and FLS2 for pathogen-associated molecular patterns, and the Ca2+ channels GLR-2.4, -2.5 and -3.3 or the vacuolar TWO PORE CHANNEL1 which might be involved in cytoplasmic Ca2+ elevation. We isolated an ethyl-methane-sulfonate-induced Arabidopsis mutant which is impaired in this Ca2+ response. The roots of the mutant are impaired in M. hyalina-mediated suppression of immune responses after Alternaria brassicae infection, i.e. jasmonate accumulation, generation of reactive oxygen species, as well as the activation of jasmonate-related defense genes. Furthermore, they are more colonized by M. hyalina than wild-type roots. We propose that the mutant gene product is involved in a Ca2+-dependent signaling pathway activated by M. hyalina to suppress immune responses in Arabidopsis roots.

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 Dates: 2018-09-262019-02-042019-03
 Publication Status: Published in print
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 Identifiers: Other: MIT002
DOI: 10.1094/MPMI-05-18-0115-R
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Title: Molecular Plant-Microbe Interactions
Source Genre: Journal
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Publ. Info: St. Paul, MN : APS Press
Pages: - Volume / Issue: 32 (3) Sequence Number: - Start / End Page: 351 - 363 Identifier: ISSN: 0894-0282
CoNE: https://pure.mpg.de/cone/journals/resource/954925558505