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Table 3 Linkage disequilibrium analysis of B. cenocepacia IIIB and BCC6 populations according to their geographic origin.

From: Genetic relationships among Italian and Mexican maize-rhizosphere Burkholderia cepacia complex (BCC) populations belonging to Burkholderia cenocepaciaIIIB and BCC6 group

Group selection Mean genetic
diversity (H mean )a
Observed
variance (VD)
Expected variance
(Ve)
I A S Pvalueb Linkage disequilibrium
B. cenocepaciaIIIB population      
All isolates 0.6576 ± 0.0680 1.1538 1.0332 0.0292 0.0187 Yes
RTs only 0.6675 ± 0.0671 1.0982 1.0196 0.0193 0.127 No
Italian isolates 0.6462 ± 0.0533 1.0629 1.0865 -0.0054 1.000 No
RTs only 0.6462 ± 0.0533 1.0629 1.0865 -0.0054 1.000 No
Mexican isolates 0.6235 ± 0.0776 1.3282 1.0534 0.0652 0.0041 Yes
RTs only 0.6250 ± 0.0760 1.2806 1.0565 0.0530 0.0323 Yes
BCC6 population       
All isolates 0.4918 ± 0.1427 0.9421 0.8423 0.0296 0.0025 Yes
RTs only 0.5447 ± 0.1499 0.7382 0.7906 -0.0165 1.000 No
Italian isolates 0.4518 ± 0.1425 0.9750 0.8324 0.0428 0.0002 Yes
RTs only 0.5195 ± 0.1477 0.7664 0.8118 -0.0140 1.000 No
Mexican isolates 0.5424 ± 0.1483 0.9159 0.8014 0.0357 0.164 No
RTs only 0.5778 ± 0.1573 0.6465 0.7249 -0.0271 1.000 No
  1. aMean genetic diversity per locus ± standard deviation.
  2. bThe measure of linkage disequilibrium is performed by testing the null hypothesis (HO):V D = V e , where V D is the variance calculated from the distribution of mismatch values of variance and V e is the variance expected for linkage equilibrium. P values are derived from parametric method [57] and indicate the significance of linkage disequilibrium. If the I A S (P < 0.05) value differs significantly from zero, the null hypothesis of linkage equilibrium is rejected.