Abstract
Leptosphaeria maculans causes phoma stem canker, the most serious disease of oilseed rape world-wide. Sexual recombination is important in the pathogen life cycle and increases the risk of plant resistance genes being overcome rapidly. Thus, there is a need to develop easy-to-use molecular markers suitable for large-scale population genetic studies. The minisatellite MinLm1, showing six alleles in natural populations, has previously been used as a marker to survey populations. Here, we report the characterization of five new minisatellites (MinLm2–MinLm6), of which four were identified by a systematic search for tandemly repeated polymorphic regions in BAC-end sequencing data from L. maculans. Of 782 BAC-end sequences analysed, 43 possessed putative minisatellite-type repeats and four of these (MinLm3–MinLm6) displayed both consistent PCR amplification and size polymorphism in a collection of L. maculans isolates of diverse origins. Cloning and sequencing of each allele confirmed that polymorphism was due to variation in the repeat number of a core motif ranging from 11 bp (MinLm3) to 51 bp (MinLm4). The number of alleles found for each minisatellite ranged from three (MinLm4) to nine (MinLm2), with eight, five and six for MinLm3, MinLm5 and MinLm6, respectively. MinLm2–MinLm6 are all single locus markers specific to L. maculans and share some common features, such as conservation of core motifs and incomplete direct repeats in the flanking regions. To our knowledge, L. maculans is the first fungal species for which six polymorphic single locus minisatellite markers have been reported.
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Acknowledgements
Financial support for this project is gratefully acknowledged. M.E. was funded by the European Union (Marie Curie Fellowship HPMT-CT-2001-00395), the Biotechnology and Biological Sciences Research Council and DuPont. M.J. received funds from the State Committee for Scientific research (KBN), Poland, and the Polish–French integrated research action Polonium 2002. All providers of isolates and support staff at PMDV INRA Versailles are thanked for their assistance and thanks are due to the anonymous reviewers for suggesting further interesting elements to discuss.
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Eckert, M., Gout, L., Rouxel, T. et al. Identification and characterization of polymorphic minisatellites in the phytopathogenic ascomycete Leptosphaeria maculans. Curr Genet 47, 37–48 (2005). https://doi.org/10.1007/s00294-004-0539-z
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DOI: https://doi.org/10.1007/s00294-004-0539-z