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Multiple Didymella teleomorphs are linked to the Phoma clematidina morphotype
J H C Woudenberg1, M M Aveskamp, J de Gruyter
1CBS Fungal Biodiversity Centre, P.O. Box 85167, 3508 AD Utrecht, The Netherlands;
Persoonia
|March 4, 2010
Summary
Phoma clematidina, a fungus used for biocontrol of invasive Clematis vitalba, shows distinct genetic diversity. Phylogenetic analysis revealed three clades linked to host specificity, leading to new species descriptions.
Area of Science:
- Mycology
- Plant Pathology
- Biocontrol
Background:
- Phoma clematidina is utilized as a biological control agent against the invasive plant Clematis vitalba in New Zealand.
- Discovery of perithecial-forming strains prompted further investigation into the diversity of P. clematidina.
Purpose of the Study:
- To assess the genetic diversity within Phoma clematidina.
- To clarify the teleomorph-anamorph relationship of P. clematidina.
- To investigate species relationships within the Didymellaceae family associated with Clematis.
Main Methods:
- Phylogenetic analyses were performed on 18 P. clematidina strains, reference Phoma strains, and related species associated with Clematis.
- Partial gene sequences of ITS1, ITS2, 5.8S rRNA, ss-tubulin, and 28S rRNA were analyzed.
- Phylogenetic trees were constructed to elucidate intra- and inter-species relationships.
Main Results:
- Phylogenetic analyses resolved P. clematidina into three distinct, well-supported clades.
- These clades correlated with observed differences in host specificity.
- New species Didymella clematidis was described, and P. clematidina and D. vitalbina were redescribed.
Conclusions:
- P. clematidina exhibits significant genetic diversity structured into host-specific clades.
- The study clarifies the taxonomic status and relationships of Phoma species associated with Clematis.
- This research provides a foundation for understanding and optimizing biocontrol strategies using P. clematidina.
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