A tandemly repeated sequence from the Plasmopara halstedii genome.
A 747-bp tandem repeat element from the genome of P. halstedii, the causal agent of downy mildew of sunflower, was cloned and analysed. The clone can be used as a probe to distinguish races of the pathogen. Sequence analysis of a copy of this element revealed the presence of 103 direct repeats of ≥6 bp and 2 potential ORFs. This tandemly repeated element consists of 4 subunits that may have evolved as a result of several unequal crossing-over events.