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Title:   Author  item
                                            TRAVADON, RENAUD - University Of Californiaitem
                                            Baumgartner, Kendraitem
                                            ROLSHAUSEN, PHILIPPE - University Of Californiaitem
                                            SOSNOWSKI, MARK - Adelaide Universityitem
                                            TROUILLAS, FLORENT - University Of Californiaitem
                                            GUBLER, W.DOUGLAS - University Of California
  Submitted to: Phytopathology
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 5/5/2009
                                    Publication  Date: 8/1/2009
                                    Citation: Travadon, R., Baumgartner, K., Rolshausen, P., Sosnowski, M.R., Trouillas, F., Gubler, W. 2009. POPULATION STRUCTURE AND DIVERSITY OF EUTYPA LATA FROM MEDITERRANEAN GRAPE-GROWING REGIONS. Phytopathology. 99:S108.Interpretive Summary:
                                Technical Abstract: Eutypa lata is an ascomycete fungus causing dieback of grape (Vitis vinifera). We examined the genetic structure of eight vineyard collections using nine polymorphic microsatellite loci. In California, isolates were collected from four vineyards (CS1, CS2, M1 and M2) separated by distances of 50 m to 21 km. In Australia, isolates were collected from four vineyards (CS3, Sh1, Sh2 and Sh3) separated by distances of 80 to 410 km. Among the 145 isolates analyzed 134 unique multilocus haplotypes were identified based on unique combinations of alleles among the microsatellite loci. Among all vineyards, gene diversity (H=0.56 to 0.62) and genotypic diversity (G=0.85 to 1) were high, and there was no linkage disequilibrium among loci (P<0.01). We found that >93% of genetic variance was found within vineyards (P<0.01) and 3.24% of variance could be attributed to differences among continents (P<0.05). Three pairwise comparisons revealed significant genetic differentiation between continents: Sh3 vs. both CS2 and M2 (FST=0.03 and 0.10, respectively; P<0.05), and Sh2 vs. M1 (FST=0.05; P<0.05). These findings, coupled with our finding of moderately low genetic differentiation between continents (FST=0.03; P<0.05), suggest that E. lata collections are part of a single panmictic population at the regional scale within continents, and gene flow is restricted between the two continents.


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