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and percentage polymorphic loci were estimated as 0.58, 2.09, and 87%, respectively. Analysis
of molecular variance showed that 81% of the genetic variance occurred within populations
and 19% occurred between populations. Cluster analysis by the unweighted pair group method
indicated that ToxB? isolates grouped together and were distantly related to ToxB+ isolates.
Based on Nei¡¯s analysis, the global collection clustered into two distinct groups according to
their region of origin. The results suggest that geographic origin and the host specificity
imposed by different NEs can lead to differentiation among P. tritici-repentis populations.
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