European Journal of Plant Pathology (2001) 107, 285-290

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Frank Schnieder, Georg Koch, Christian Jung and Joseph-Alexander Verreet (2001)
Genotypic diversity of the wheat leaf blotch pathogen Mycosphaerella graminicola (anamorph) Septoria tritici in Germany
European Journal of Plant Pathology 107 (3), 285-290
Abstract: The population structure and genotypic diversity of Mycosphaerella graminicola from six natural field populations in Germany were studied with molecular markers. To reveal the potential effects of plant host resistance on the pathogen population, hierarchical samples were taken from susceptible and resistant cultivars. A total of 203 single spore isolates was subjected to molecular marker analysis using the amplified fragment length polymorphism technique (AFLP). Among the 203 isolates analyzed, 142 different multilocus haplotypes (MLH) were identified revealing a high degree of genotypic diversity of the M. graminicola population. On average, a F_ST value of 0.04 was found, indicating a low genetic differentiation with only 4% of the genetic variation between the local populations but leaving 96% of the genetic variation within the populations. According to the low F_ST value, a high migration rate of Nm » 12 was found. The observed high within-population diversity, and the significant migration between populations, prevented genetic isolation and differentiation of putative geographically separated populations. Furthermore, plant host resistance had no obvious effect on the population structure and diversity of M. graminicola. Genotypic variability can be attributed to sexual recombination which appears to have a considerably larger influence on the population structure. Gene flow on this scale could have significant implications for plant breeding and fungicide spraying programmes.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Joseph-Alexander Verreet, Christian Jung

Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution
resistance/tolerance/defence of host

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Zymoseptoria tritici Wheat (Triticum) Germany
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