. 2012 Jun 1;12:76. doi: 10.1186/1471-2148-12-76

Table 6.

Population structure ofBlumeria graminisby geographic region, host origin and pathogenicity

Populations compared^a	S_nnb	H_STc
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	0.7283^ns	−0.0025^ns
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)	0.6597^ns	0.0019^ns
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.

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

^cH_ST is a measure of population subdivision that estimates F_ST among populations.

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