FISH analysis of B chromosome repetitive DNA distribution in A and B chromosomes of two subspecies of Podisma sapporensis (P. s. sapporensis and P. s. krylonensis) was performed. In the B chromosomes, C-positive regions contained homologous DNA repeats present also in some C-positive A chromosome regions. Most C-negative regions contained DNA repeats characteristic of A chromosome euchromatic regions. The two subspecies analyzed differed in the location of A chromosome regions enriched with repeats homologous to repeats of B chromosomes. The only common region enriched with these B chromosome repeats in both subspecies was the X chromosome pericentromeric region. The origin of B chromosomes in P. sapporensis is discussed.
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