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A suppressor/avirulence gene combination in Hyaloperonospora arabidopsidis determines race specificity in Arabidopsis thaliana

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Woods-Tör, Alison, Studholme, David J., Cevik, Volkan, Telli, Osman, Holub, E. B. and Tör, Mahmut (2018) A suppressor/avirulence gene combination in Hyaloperonospora arabidopsidis determines race specificity in Arabidopsis thaliana. Frontiers in Plant Science, 9 . 265. doi:10.3389/fpls.2018.00265

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Official URL: http://dx.doi.org/10.3389/fpls.2018.00265

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Abstract

The pathosystem of Arabidopsis thaliana and diploid biotrophic oomycete Hyaloperonospora arabidopsidis (Hpa) has been a model for investigating the molecular basis of Flor's gene-for-gene hypothesis. The isolates Hpa-Noks1 and Hpa-Cala2 are virulent on Arabidopsis accession RMX-A02 whilst an F1 generated from a cross between these two isolates was avirulent. The F2 progeny segregated 3,1 (avirulent, virulent), indicating a single major effect AVR locus in this pathogen. SNP-based linkage mapping confirmed a single AVR locus within a 14 kb map interval containing two genes encoding putative effectors. The Hpa-Cala2 allele of one gene, designated H. arabidopsidis cryptic1 (HAC1), encodes a protein with a signal peptide and an RxLR/dEER motif, and triggers a defense response in RMX-A02. The second gene is heterozygous in Hpa-Cala2. One allele, designated Suppressor of HAC1Cala2 (S-HAC1Cala2) encodes a protein with a signal peptide and a dKEE motif with no RxLR motif; the other allele (s-hac1 Cala2) encodes a protein with a signal peptide, a dEEE motif and is divergent in sequence from the S-HAC1Cala2 allele. In selfed progeny from Hpa-Cala2, dominant S-HAC1Cala2 allele carrying progeny correlates with virulence in RMX-A02, whereas homozygous recessive s-hac1Cala2 carrying progeny were avirulent. Genetic investigations suggested other heterozygous suppressor loci might exist in the Hpa-Cala2 genome.

Item Type: Journal Article
Subjects: Q Science > QH Natural history > QH426 Genetics
Q Science > QK Botany
Divisions: Faculty of Science > Life Sciences (2010- )
Library of Congress Subject Headings (LCSH): Arabidopsis thaliana -- Genetic aspects, Oomycetes, Plant diseases
Journal or Publication Title: Frontiers in Plant Science
Publisher: Frontiers Media S.A.
ISSN: 1664-462X
Official Date: 1 March 2018
Dates:
DateEvent
1 March 2018Published
14 February 2018Accepted
Date of first compliant deposit: 6 April 2018
Volume: 9
Article Number: 265
DOI: 10.3389/fpls.2018.00265
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
F-09 963/ALeverhulme Trusthttp://dx.doi.org/10.13039/501100000275
UNSPECIFIEDTurkey. Millî Eğitim Bakanlığıhttp://viaf.org/viaf/146607793

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