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Natural variation in insect egg-induced cell death uncovers a role for L-type LECTIN RECEPTOR KINASE-I.1 in Arabidopsis

Raphaël Groux, Caroline Gouhier-Darimont, Envel Kerdaffrec, Philippe Reymond
doi: https://doi.org/10.1101/2020.05.29.122846
Raphaël Groux
1Department of Plant Molecular Biology, University of Lausanne, CH-1015 Lausanne, Switzerland
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Caroline Gouhier-Darimont
1Department of Plant Molecular Biology, University of Lausanne, CH-1015 Lausanne, Switzerland
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Envel Kerdaffrec
2Department of Biology, University of Fribourg, CH-1700 Fribourg, Switzerland
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Philippe Reymond
1Department of Plant Molecular Biology, University of Lausanne, CH-1015 Lausanne, Switzerland
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  • For correspondence: philippe.reymond@unil.ch
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Abstract

In Arabidopsis thaliana, a hypersensitive-like response (HR-like) is triggered underneath the eggs of the large white butterfly Pieris brassicae, and this response is dependent on salicylic acid (SA) accumulation and signaling. Previous reports indicate that the clade I L-type lectin receptor kinase LecRK-I.8 is involved in early steps of egg recognition. A genome-wide association study (GWAS) was used to better characterize the genetic structure of HR-like and discover loci that contribute to this response. We report here the identification of LecRK-I.1, a close homolog of LecRK-I.8, and show that two main haplotypes that explain part of the variation in HR-like segregate amongst natural Arabidopsis accessions. In addition, signatures of balancing selection at this locus suggest that it may be ecologically important. Disruption of LecRK-I.1 resulted in decreased HR-like and SA signaling, indicating that this protein is important for the observed responses. Furthermore, we provide evidence that LecRK-I.1 functions in the same signaling pathway as LecRK-I.8. Altogether, our results show that the response to eggs of P. brassicae is controlled by LecRKs that operate at various steps of the signaling pathway.

Competing Interest Statement

The authors have declared no competing interest.

Footnotes

  • The abstract was modified to summarize the results more precisely.

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. All rights reserved. No reuse allowed without permission.
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Posted June 05, 2020.
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Natural variation in insect egg-induced cell death uncovers a role for L-type LECTIN RECEPTOR KINASE-I.1 in Arabidopsis
Raphaël Groux, Caroline Gouhier-Darimont, Envel Kerdaffrec, Philippe Reymond
bioRxiv 2020.05.29.122846; doi: https://doi.org/10.1101/2020.05.29.122846
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Natural variation in insect egg-induced cell death uncovers a role for L-type LECTIN RECEPTOR KINASE-I.1 in Arabidopsis
Raphaël Groux, Caroline Gouhier-Darimont, Envel Kerdaffrec, Philippe Reymond
bioRxiv 2020.05.29.122846; doi: https://doi.org/10.1101/2020.05.29.122846

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