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A single, plastic population of Mycosphaerella pinodes causes ascochyta blight on winter and spring peas (Pisum sativum) in France.
- Source :
-
Applied and environmental microbiology [Appl Environ Microbiol] 2012 Dec; Vol. 78 (23), pp. 8431-40. Date of Electronic Publication: 2012 Sep 28. - Publication Year :
- 2012
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Abstract
- Plant diseases are caused by pathogen populations continuously subjected to evolutionary forces (genetic flow, selection, and recombination). Ascochyta blight, caused by Mycosphaerella pinodes, is one of the most damaging necrotrophic pathogens of field peas worldwide. In France, both winter and spring peas are cultivated. Although these crops overlap by about 4 months (March to June), primary Ascochyta blight infections are not synchronous on the two crops. This suggests that the disease could be due to two different M. pinodes populations, specialized on either winter or spring pea. To test this hypothesis, 144 pathogen isolates were collected in the field during the winter and spring growing seasons in Rennes (western France), and all the isolates were genotyped using amplified fragment length polymorphism (AFLP) markers. Furthermore, the pathogenicities of 33 isolates randomly chosen within the collection were tested on four pea genotypes (2 winter and 2 spring types) grown under three climatic regimes, simulating winter, late winter, and spring conditions. M. pinodes isolates from winter and spring peas were genetically polymorphic but not differentiated according to the type of cultivars. Isolates from winter pea were more pathogenic than isolates from spring pea on hosts raised under winter conditions, while isolates from spring pea were more pathogenic than those from winter pea on plants raised under spring conditions. These results show that disease developed on winter and spring peas was initiated by a single population of M. pinodes whose pathogenicity is a plastic trait modulated by the physiological status of the host plant.
- Subjects :
- Amplified Fragment Length Polymorphism Analysis
Ascomycota classification
Ascomycota genetics
France
Genetic Variation
Genotype
Molecular Typing
Mycological Typing Techniques
Seasons
Ascomycota isolation & purification
Ascomycota pathogenicity
Pisum sativum microbiology
Plant Diseases microbiology
Subjects
Details
- Language :
- English
- ISSN :
- 1098-5336
- Volume :
- 78
- Issue :
- 23
- Database :
- MEDLINE
- Journal :
- Applied and environmental microbiology
- Publication Type :
- Academic Journal
- Accession number :
- 23023742
- Full Text :
- https://doi.org/10.1128/AEM.01543-12