Table 6

Population structure ofBlumeria graminisby geographic region, host origin and pathogenicity
Populations compareda Snnb HSTc
By geographic region
 Region A (36) vs. region B (14) vs. region C (10) vs. region D (6) 0.5468* 0.0469**
By host origin
 triticale (33) vs. wheat (33) 0.8654** 0.0397**
By year of collection within host origin wheat
 Region D 1980’s (6) vs. Region A-B-C 2009–2010 0.7283ns −0.0025ns
By geographic region within host origin triticale
 region A (16) vs. region B (8) vs. region C (9) 0.5899** 0.1008**
 region A (16) vs. region B (8) 0.6597ns 0.0019ns
 region A (16) vs. region C (9) 0.7667* 0.1116*
 region B (8) vs. region C (9) 0.8677* 0.1428*
By pathogenicity
 Pathogenic (37) vs. non-pathogenic (29) on triticale 0.9811** 0.0565**

Region A represents Belgium, region B France, region C Poland and region D Israel.

aSample sizes are in parentheses.

bSnn (the nearest neighbor statistic) measures how often the most similar sequence (or sequences) is from the same designated population. Snn has a high power with small population sizes.

cHST is a measure of population subdivision that estimates FST among populations.

P-values were estimated after 1000 permutations; nsP > 0.01; *P < 0.01; **P < 0.001.

Troch et al.

Troch et al. BMC Evolutionary Biology 2012 12:76   doi:10.1186/1471-2148-12-76

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