Genetic variability and distribution of mating type alleles in field populations of Leptosphaeria maculans from France.

ABSTRACT: Leptosphaeria maculans is the most ubiquitous fungal pathogen of Brassica crops and causes the devastating stem canker disease of oilseed rape worldwide. We used minisatellite markers to determine the genetic structure of L. maculans in four field populations from France. Isolates were collected at three different spatial scales (leaf, 2-m2 field plot, and field) enabling the evaluation of spatial distribution of the mating type alleles and of genetic variability within and among field populations. Within each field population, no gametic disequilibrium between the minisatellite loci was detected and the mating type alleles were present at equal frequencies. Both sexual and asexual reproduction occur in the field, but the genetic structure of these populations is consistent with annual cyc

SUBMITTER: Gout L 

PROVIDER: S-EPMC1352181 | biostudies-literature | 2006 Jan

REPOSITORIES: biostudies-literature