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Comparative Genomics of a Plant-Pathogenic Fungus, Pyrenophora tritici-repentis , Reveals Transduplication and the Impact of Repeat Elements on Pathogenicity and Population Divergence

Viola A Manning, Iovanna Pandelova, Braham Dhillon and 23 more

G3 Genes|Genomes|Genetics · 2013

doi:10.1534/g3.112.004044

Abstract

Pyrenophora tritici-repentis is a necrotrophic fungus causal to the disease tan spot of wheat, whose contribution to crop loss has increased significantly during the last few decades. Pathogenicity by this fungus is attributed to the production of host-selective toxins (HST), which are recognized by their host in a genotype-specific manner. To better understand the mechanisms that have led to the increase in disease incidence related to this pathogen, we sequenced the genomes of three P. tritici-repentis isolates. A pathogenic isolate that produces two known HSTs was used to assemble a reference nuclear genome of approximately 40 Mb composed of 11 chromosomes that encode 12,141 predicted genes. Comparison of the reference genome with those of a pathogenic isolate that produces a third HST, and a nonpathogenic isolate, showed the nonpathogen genome to be more diverged than those of the two pathogens. Examination of gene-coding regions has provided candidate pathogen-specific proteins and revealed gene families that may play a role in a necrotrophic lifestyle. Analysis of transposable elements suggests that their presence in the genome of pathogenic isolates contributes to the creation of novel genes, effector diversification, possible horizontal gene transfer events, identified copy number variation, and the first example of transduplication by DNA transposable elements in fungi. Overall, comparative analysis of these genomes provides evidence that pathogenicity in this species arose through an influx of transposable elements, which created a genetically flexible landscape that can easily respond to environmental changes.

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    Kim H. Ahn J. H. Gorlach J. M. Caprari C. Scott-Craig J. S., 2001 Mutational analysis of beta-glucanase genes from the plant-pathogenic fungus Cochliobolus carbonum. Mol. Plant Microbe Interact. 14: 1436–1443

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    Kohli M. Mehta Y. Ackermann M., 1992 Spread of tan spot in the Southern Cone Region of South America, pp. 86–90 in Second International Tan Spot Workshop, edited by Francl L. J. Krupinsky J. McMullen M. North Dakota State University, Fargo, ND

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    Krupinsky J. M., 1982 Observations on the host range of isolates of Pyrenophora trichostoma. Can. J. Plant Pathol. 4: 42–46

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    Kwon C. Y. Rasmussen J. B. Meinhardt S. W., 1998 Activity of Ptr ToxA from Pyrenophora tritici-repentis requires host metabolism. Physiol. Mol. Plant Pathol. 52: 201–212

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    Lamari L. Bernier C. C., 1991 Genetics of tan necrosis and extensive chlorosis in tan spot of wheat caused by Pyrenophora tritici-repentis. Phytopathology 91: 1092–1095

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    Lamari L. Strelkov S. E. Yahyaoui A. Orabi J. Smith R. B., 2003 The identification of two new races of Pyrenophora tritici-repentis from the host center of diversity confirms a one-to-one relationship in tan spot of wheat. Phytopathology 93: 391–396

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    Lamari L. Strelkov S. E. Yahyaoui A. Amedov M. Saidov M., 2005 Virulence of Pyrenophora tritici-repentis in the countries of the Silk Road. Can. J. Plant Pathol. 27: 383–388

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    Lee B.-N. Kroken S. Chou D. Y. T. Robbertse B. Yoder O. C., 2005 Functional analysis of all nonribosomal peptide synthetases in Cochliobolus heterostrophus reveals a factor, NPS6, involved in virulence and resistance to oxidative stress. Eukaryot. Cell 4: 545–555

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    Leisova L. Hanzalova A. Kucera L., 2008 Genetic diversity of Pyrenophora tritici-repentis isolates as revealed by AFLP analysis. J. Plant Pathol. 90: 233–245

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    Leisova-Svobodova L. Hanzalova A. Kucera L., 2010b The variability of a Pyrenophora tritici-repentis population as revealed by inter-retrotransposon amplified polymorphism with regard to the Ptr ToxA gene. Czech Mycol. 61: 125–128

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    Lepoint P. Renard M.-E. Legreve A. Duveiller E. Maraite H., 2010 Genetic diversity of the mating type and toxin production genes in Pyrenophora tritici-repentis. Phytopathology 100: 474–483

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    Li H. Ruan J. Durbin R., 2008 Mapping short DNA sequencing reads and calling variants using mapping quality scores. Genome Res. 18: 1851–1858

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    Lichter A. Gaventa J. M. Ciuffetti L. M., 2002 Chromosome-based molecular characterization of pathogenic and non-pathogenic wheat isolates of Pyrenophora tritici-repentis. Fungal Genet. Biol. 37: 180–189

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  121. 121.

    Lin J. Qi R. Aston C. Jing J. Anantharaman T. S., 1999 Whole-genome shotgun optical mapping of Deinococcus radiodurans. Science 285: 1558–1562

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    Liu Z. Ellwood S. R. Oliver R. P. Friesen T. L., 2011 Pyrenophora teres: profile of an increasingly damaging barley pathogen. Mol. Plant Pathol. 12: 1–19

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    Loftus B. Anderson I. Davies R. Alsmark U. C. M. Samuelson J., 2005 The genome of the protist parasite Entamoeba histolytica. Nature 433: 865–868

    Not in our library10.1038/nature03291

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    Lönneborg A. Sharma P. Stougaard P., 1995 Construction of subtractive cDNA library using magnetic beads and PCR. PCR Methods Appl. 4: 168–176

    Not in our library10.1101/gr.4.4.s168

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    Lorang J. M. Tuori R. P. Martinez J. P. Sawyer T. L. Redman R. S., 2001 Green fluorescent protein is lighting up fungal biology. Appl. Environ. Microbiol. 67: 1987–1994

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    Lysoe E. Bone K. R. Klemsdal S. S., 2009 Real-time quantitative expression studies of the zearalenone biosynthetic gene cluster in Fusarium graminearum. Phytopathology 99: 176–184

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    Ma L. J. Van Der Does H. C. Borkovich K. A. Coleman J. J. Daboussi M. J., 2010 Comparative genomics reveals mobile pathogenicity chromosomes in Fusarium. Nature 464: 367–373

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    Maloney A. P. VanEtten H. D., 1994 A gene from the fungal plant pathogen Nectria haematococca that encodes the phytoalexin-detoxifying enzyme pisatin demethylase defines a new cytochrome P450 family. Mol. Gen. Genet. 243: 506–514

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    Manning V. A. Ciuffetti L. M., 2005 Localization of Ptr ToxA Produced by Pyrenophora tritici-repentis reveals protein import into wheat mesophyll cells. Plant Cell 17: 3203–3212

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    Manning V. A. Hamilton S. M. Karplus P. A. Ciuffetti L. M., 2008 The Arg-Gly-Asp−containing, solvent-exposed loop of Ptr ToxA is required for internalization. Mol. Plant Microbe Interact. 21: 315–325

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  131. 131.

    Manning V. A. Chu A. L. Steeves J. E. Wolpert T. J. Ciuffetti L. M., 2009 A host-selective toxin of Pyrenophora tritici-repentis, Ptr ToxA, induces photosystem changes and reactive oxygen species accumulation in sensitive wheat. Mol. Plant Microbe Interact. 22: 665–676

    Not in our library10.1094/mpmi-22-6-0665

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    Markham J. E. Hille J., 2001 Host-selective toxins as agents of cell death in plant-fungus interactions. Mol. Plant Pathol. 2: 229–239

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  134. 134.

    Martinez J. P. Oesch N. W. Ciuffetti L. M., 2004 Characterization of the multiple-copy host-selective toxin gene, ToxB, in pathogenic and nonpathogenic isolates of Pyrenophora tritici-repentis. Mol. Plant Microbe Interact. 17: 467–474

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  141. 141.

    Pandelova I. Betts M. F. Manning V. A. Wilhelm L. J. Mockler T. C., 2009 Analysis of transcriptome changes induced by Ptr ToxA in wheat provides insights into the mechanisms of plant susceptibility. Molec. Plant 2: 1067–1083

    Not in our library10.1093/mp/ssp045

  142. 142.

    Pandelova I. Figueroa M. Wilhelm L. J. Manning V. A. Mankaney A. N., 2012 Host-selective toxins of Pyrenophora tritici-repentis induce common responses associated with host susceptibility. PLoS ONE 7: e40240

    Not in our library10.1371/journal.pone.0040240

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    Pautasso M. Döring T. Garbelotto M. Pellis L. Jeger M., 2012 Impacts of climate change on plant diseases—opinions and trends. Eur. J. Plant Pathol. 133: 1–19

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    Postnikova E. N. Khasanov B. A., 1998 Tan spot in Central Asia, pp. 107–113 in Helminthosporium Blights of Wheat: Spot Blotch and Tan Spot, El Batan, Mexico, edited by E. Duveiller, H. J. Dubin, J. Reeves, A. McNab. CIMMYT (International Maize and Wheat Improvement Center), Mexico, D.F., Mexico

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  145. 145.

    Pujol Vieira Dos Santos A. M. Santos Matsumura A. T. Van Der Sand S. T., 2002 Intraspecific genetic diversity of Drechslera tritici-repentis as detected by a random amplified polymorphic DNA analysis. Genet. Mol. Biol. 25: 243–250

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  146. 146.
  147. 147.

    Raffaele S. Kamoun S., 2012 Genome evolution in filamentous plant pathogens: why bigger can be better. Nat. Rev. Microbiol. 10: 417–430

    Not in our library10.1038/nrmicro2790

  148. 148.
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    Rasmussen J. B. Kwon C. Y. Meinhardt S. W., 2004 Requirement of host signaling mechanisms for the action of Ptr ToxA in wheat. Eur. J. Plant Pathol. 110: 333–335

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    Rees R. G. Platz G. J., 1983 Effects of yellow spot on wheat: comparison of epidemics at different stages of crop development. Aust. J. Agric. Res. 31: 259–267

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  151. 151.

    Rees R. G. Platz G. J., 1992 Tan spot and its control—some Australian experiences. pp. 1–9 in Second International Tan Spot Workshop, edited by Francl L. J. Krupinsky J. McMullen M. North Dakota State University, Fargo, ND

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    Reeves C. D. Hu Z. Reid R. Kealey J. T., 2008 Genes for the biosynthesis of the fungal polyketides hypothemycin from Hypomyces subiculosus and radicicol from Pochonia chlamydosporia. Appl. Environ. Microbiol. 74: 5121–5129

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  153. 153.

    Rep M., 2005 Small proteins of plant-pathogenic fungi secreted during host colonization. FEMS Microbiol. Lett. 253: 19–27

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  154. 154.

    Rice P. Longden I. Bleasby A., 2000 EMBOSS: the European Molecular Biology Open Software Suite. Trends Genet. 16: 76–77

    Not in our library10.1016/s0168-9525(00)02024-2

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    Robbertse B. Reeves J. B. Schoch C. L. Spatafora J. W., 2006 A phylogenomic analysis of the Ascomycota. Fungal Genet. Biol. 43: 715–725

    Not in our library10.1016/j.fgb.2006.05.001

  156. 156.

    Robbertse B. Yoder R. J. Boyd A. Reeves J. Spatafora J. W., 2011 Hal: an automated pipeline for phylogenetic analyses of genomic data. PLoS Curr. 3: RRN1213

    Not in our library10.1371/currents.rrn1213

  157. 157.

    Rouxel T. Grandaubert J. Hane J. K. Hoede C. Van De Wouw A. P., 2011 Effector diversification within compartments of the Leptosphaeria maculans genome affected by repeat-induced point mutations. Nat. Commun. 2: 202

    Not in our library10.1038/ncomms1189

  158. 158.

    Sarma G. N. Manning V. A. Ciuffetti L. M. Karplus P. A., 2005 Structure of Ptr ToxA: an RGD-containing host-selective toxin from Pyrenophora tritici-repentis. Plant Cell 17: 3190–3202

    Not in our library10.1105/tpc.105.034918

  159. 159.

    Schoch C. L. Shoemaker R. A. Seifert K. A. Hambleton S. Spatafora J. W., 2006 A multigene phylogeny of the Dothideomycetes using four nuclear loci. Mycologia 98: 1041–1052

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    Schoch C. L. Sung G. H. Lopez-Giraldez F. Townsend J. P. Miadlikowska J., 2009b The Ascomycota tree of life: a phylum-wide phylogeny clarifies the origin and evolution of fundamental reproductive and ecological traits. Syst. Biol. 58: 224–239

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    Schwarzer D. Marahiel M. A., 2001 Multimodular biocatalysts for natural product assembly. Naturwissenschaften 88: 93–101

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    Selker E. U. Cambareri E. B. Jensen B. C. Haack K. R., 1987 Rearrangement of duplicated DNA in specialized cells of Neurospora. Cell 51: 741–752

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    Shaukat A. Francl L. J., 2002 Race structure of Pyrenophora tritici-repentis isolates obtained from wheat in South America. Plant Prot. Sci. 38: 302–304

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  165. 165.

    Singh P. K. Hughes G. R., 2006 Genetic similarity among isolates of Pyrenophora tritici-repentis, causal agent of tan spot of wheat. J. Phytopathol. 154: 178–184

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  166. 166.

    Spanu P. D. Abbott J. C. Amselem J. Burgis T. A. Soanes D. M., 2010 Genome expansion and gene loss in powdery mildew fungi reveal tradeoffs in extreme parasitism. Science 330: 1543–1546

    Not in our library10.1126/science.1194573

  167. 167.

    Spatafora J. W. Sung G. H. Johnson D. Hesse C. O’rourke B., 2006 A five-gene phylogeny of Pezizomycotina. Mycologia 98: 1018–1028

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  168. 168.

    Sposato P. Ahn J. H. Walton J. D., 1995 Characterization and disruption of a gene in the maize pathogen Cochliobolus carbonum encoding a cellulase lacking a cellulose binding domain and hinge region. Mol. Plant Microbe Interact. 8: 602–609

    Not in our library10.1094/mpmi-8-0602

  169. 169.

    Stamatakis A., 2006 RAxML-VI-HPC: maximum likelihood-based phylogenetic analyses with thousands of taxa and mixed models. Bioinformatics 22: 2688–2690

    Not in our library10.1093/bioinformatics/btl446

  170. 170.

    Stergiopoulos I. De Wit P. J. G. M., 2009 Fungal effector proteins. Annu. Rev. Phytopathol. 47: 233–263

    Not in our library10.1146/annurev.phyto.112408.132637

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    Strelkov S. E. Lamari L., 2003 Host–parasite interactions in tan spot [Pyrenophora tritici-repentis] of wheat. Can. J. Plant Pathol. 25: 339–349

    Not in our library

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    Strelkov S. E. Lamari L. Ballance G. M., 1999 Characterization of a host-specific protein toxin (Ptr ToxB) from Pyrenophora tritici-repentis. Mol. Plant Microbe Interact. 12: 728–732

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  173. 173.

    Strelkov S. E. Lamari L. Sayoud R. Smith R. B., 2002 Comparative virulence of chlorosis-inducing races of Pyrenophora tritici-repentis. Can. J. Plant Pathol. 24: 29–35

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    Stukenbrock E. H. McDonald B. A., 2007 Geographical variation and positive diversifying selection in the host-specific toxin SnToxA. Mol. Plant Pathol. 8: 321–332

    Not in our library10.1111/j.1364-3703.2007.00396.x

  175. 175.

    Stukenbrock E. H. McDonald B. A., 2008 The origins of plant pathogens in agro-ecosystems. Annu. Rev. Phytopathol. 46: 75–100

    Not in our library10.1146/annurev.phyto.010708.154114

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    Summerall B. A. Klein T. A. Burgess L. W., 1988 Influence of stubble-management on yellow spot of wheat. Plant Prot. Q. 3: 12–13

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  178. 178.

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    Tan K. C. Oliver R. P. Solomon P. S. Moffat C. S., 2010 Proteinaceous necrotrophic effectors in fungal virulence. Funct. Plant Biol. 37: 907–912

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  180. 180.

    Tomas A. Bockus W. W., 1987 Cultivar-specific toxicity of the culture filtrates of Pyrenophora tritici-repentis. Phytopathology 77: 1337–1340

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    Tomas A. Feng G. H. Reeck G. R. Bockus W. W. Leach J. E., 1990 Purification of a cultivar-specific toxin from Pyrenophora tritici-repentis, causal agent of tan spot of wheat. Mol. Plant Microbe Interact. 3: 221–224

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    Tuori R. P. Wolpert T. J. Ciuffetti L. M., 1995 Purification and immunological characterization of toxic components from cultures of Pyrenophora tritici-repentis. Mol. Plant Microbe Interact. 8: 41–48

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    Not in our library10.1111/j.1364-3703.2011.00763.x

  185. 185.

    Vogel J., 2008 Unique aspects of the grass cell wall. Curr. Opin. Plant Biol. 11: 301–307

    Not in our library10.1016/j.pbi.2008.03.002

  186. 186.

    Walton J. D., 2006 HC-toxin. Phytochemistry 67: 1406–1413

    Not in our library10.1016/j.phytochem.2006.05.033

  187. 187.

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    Zerbino D. R. Birney E., 2008 Velvet: algorithms for de novo short read assembly using de Bruijn graphs. Genome Res. 18: 821–829

    Not in our library10.1101/gr.074492.107

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    Zhou S. Herschleb J. Schwartz D. C., 2007 A Single Molecule System for Whole Genome Analysis. Elsevier, Amsterdam

    Not in our library

  190. 190.

    Zhou S. G. Wei F. S. Nguyen J. Bechner M. Potamousis K., 2009 A single molecule scaffold for the maize genome. PLoS Genet. 5: e1000711

    Not in our library10.1371/journal.pgen.1000711

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