The genome of the emerging barley pathogen Ramularia collo-cygni

A - Papers appearing in refereed journals

McGrann, G. R. D., Andongabo, A. E., Sjokvist, E., Trivedi, U., Dussart, F., Kaczmarek, M., Mackenzie, A., Fountaine, J. M., Taylor, J. M. G., Paterson, L. J., Gorniak, K., Burnett, F., Kanyuka, K., Hammond-Kosack, K. E., Rudd, J. J., Blaxter, M. and Havis, N. D. 2016. The genome of the emerging barley pathogen Ramularia collo-cygni. BMC Genomics. 17 (1), p. 584.

AuthorsMcGrann, G. R. D., Andongabo, A. E., Sjokvist, E., Trivedi, U., Dussart, F., Kaczmarek, M., Mackenzie, A., Fountaine, J. M., Taylor, J. M. G., Paterson, L. J., Gorniak, K., Burnett, F., Kanyuka, K., Hammond-Kosack, K. E., Rudd, J. J., Blaxter, M. and Havis, N. D.
Abstract

Background
Ramularia collo-cygni is a newly important, foliar fungal pathogen of barley that causes the disease Ramularia leaf spot. The fungus exhibits a prolonged endophytic growth stage before switching life habit to become an aggressive, necrotrophic pathogen that causes significant losses to green leaf area and hence grain yield and quality.

Results
The R. collo-cygni genome was sequenced using a combination of Illumina and Roche 454 technologies. The draft assembly of 30.3 Mb contained 11,617 predicted gene models. Our phylogenomic analysis confirmed the classification of this ascomycete fungus within the family Mycosphaerellaceae, order Capnodiales of the class Dothideomycetes. A predicted secretome comprising 1053 proteins included redox-related enzymes and carbohydrate-modifying enzymes and proteases. The relative paucity of plant cell wall degrading enzyme genes may be associated with the stealth pathogenesis characteristic of plant pathogens from the Mycosphaerellaceae. A large number of genes associated with secondary metabolite production, including homologs of toxin biosynthesis genes found in other Dothideomycete plant pathogens, were identified.

Conclusions
The genome sequence of R. collo-cygni provides a framework for understanding the genetic basis of pathogenesis in this important emerging pathogen. The reduced complement of carbohydrate-degrading enzyme genes is likely to reflect a strategy to avoid detection by host defences during its prolonged asymptomatic growth. Of particular interest will be the analysis of R. collo-cygni gene expression during interactions with the host barley, to understand what triggers this fungus to switch from being a benign endophyte to an aggressive necrotroph.

KeywordsRamularia leaf spot; Dothideomycetes; Rubellin toxin; Endophyte; Necrotroph; Whole genome sequencing
Year of Publication2016
JournalBMC Genomics
Journal citation17 (1), p. 584
Digital Object Identifier (DOI)doi:10.1186/s12864-016-2928-3
Open accessPublished as ‘gold’ (paid) open access
FunderBiotechnology and Biological Sciences Research Council
Funder project or codeWheat
Pathogen-Host Interactions Database: PHI Database [2012-2017]
[20:20 Wheat] Protecting yield potential of wheat
PhytoPath, an infrastructure for hundreds of plant pathogen genomes [2014-2017]
Publisher's version
Output statusPublished
Publication dates
Online09 Aug 2016
Publication process dates
Accepted12 Jul 2016
PublisherBiomed Central Ltd
Copyright licenseCC BY
ISSN1471-2164

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