Origins of Host Specific Populations of Puccinia triticina Revealed by SNP Markers (Preliminary) M. Liu and J. A. Kolmer USDA-ARS Cereal Disease Laboratory,

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Presentation transcript:

Origins of Host Specific Populations of Puccinia triticina Revealed by SNP Markers (Preliminary) M. Liu and J. A. Kolmer USDA-ARS Cereal Disease Laboratory, St. Paul, MN 55108

World-wide P. triticina SSR groups North America South America Central Asia Middle East Europe New Zealand South Africa Durum isolates (EU, SA, ME, NA) Aegilops speltoides 587 isolates F ST = Some geographical relationship SA, NA vs. EU, ME, CA, NZ, SAF Except ME1 with NA and SA Durum groups distinct from common wheat groups

Puccinia triticina host differentiation Bread wheat type – highly variable for SSR genotype Durum wheat type – relatively less variable for SSR genotype Wild Emmer Wheat (AB) susceptible to bread wheat type – native to Fertile Crescent Is the common wheat type the original form of P. triticina – and durum type more recently derived?

Goal: To further infer the evolutionary relationships among populations with the aid of coalescence theory and DNA single nucleotide polymorphism (SNP) markers

Why SNP? Development of SNP markers Preliminary results (poster: theme 1, #30 )

Why SNP?

Ubiquitous — accessible, representative

Why SNP? Ubiquitous — accessible, representative Variable mutation rates Suitable to automatic genotyping Amiable to sequence-based analytical tools Alternative approach

Why SNP? Development of SNP markers Preliminary results (poster: theme 1, #30 )

Sampling 7

Preliminary results 100 Clusters of P. triticina populations based on 94 SNPs from three house keeping genes, seven SSR flanking regions and six IGV selected anonymous loci. L=134 CI=0.709 RI= <50 7

Preliminary results One of most parsimonious phylograms based on SNPs from three house keeping genes and six IGV selected anonymous loci. Isolates on durum wheat formed clade. L=271 CI=0.915 RI=0.955 One of most parsimonious phylograms based on SNPs from three house keeping genes and six IGV selected anonymous loci. Isolates on durum wheat formed clade. L=271 CI=0.915 RI=0.955 Aeg ETH durum Durum NZ SAF EU-7 CA-3 NA-4 ME-1 NA-1 SA

Preliminary results Inference of haplotypes based on diploid (dikaryotic) data PHASE 2.1 Stephens, M et al A new statistical method for haplotype reconstruction from population data. American Journal of Human Genetics 68:978—989

Coalescence analysis IM, IMa, IMa2 Carbone Lab Department of Genome Science, U of Washington

ACKNOWLEDGEMENTS We thank Drs. Les Szabo, John Fellers and Christina Cuomo for facilitating ML to access IGV and Pt whole genome database; Kun Xiao, Jerry Johnson and Kim Phuong Nguyen for technical help.