Electrophoretic karyotypes of the phytopathogenic Pyrenophora graminea andP-teres

Contour-clamped homogeneous electric field has been applied to analyse geno me size and organisation of two important pathogens of barley, Pyrenophora graminea and P. teres. Electrophoretic karyotypes of four P. graminea isolates resolved 6-8 chromo somal bands, depending on the isolate, while the one P. teres isolate analy sed contained six chromosomal bands. Chromosome length polymorphism was obs erved among P. graminea isolates. For both fungi the chromosomes ranged fro m 1.6 to more than 6 Mb, with chromosomes larger than 6 Mb migrating as a s ingle band within the compression zone of the gel.