Abstract
Sclerotinia trifoliorum Erikks. causes clover rot (clover cancer, Sclerotinia crown and root rot) in red clover crops (Trifolium pratense L.), an important disease in Europe. Little is known about the aggressiveness of Scierotinia isolates and aggressiveness studies were never conducted on a European scale. In this study we compared the aggressiveness of 30 Sclerotinia isolates isolated from red clover crops in 25 locations in 12 European countries using a plant-based bio-test. Plants from 6 red clover cultivars with different resistance levels were spray inoculated at the age of 12 weeks with 1 to 1.5 ml mycelium fragment suspension per plant. After 10 days incubation, plants were scored on a scale from 1 (healthy plant) to 5 (dead plant) and the disease index was calculated. The experiment was repeated 3 times and all repetitions were highly correlated. Average disease indices ranged from 52.6% to 82.7%. Significant differences were detected between isolates and between cultivars, but there was no isolate--cultivar interaction. Based on these results, the most aggressive isolates can be selected for resistance breeding. Future work should investigate whether the differences in aggressiveness are due to a higher growth speed or due to a higher secretion of cell-wall degrading components and pathogenicity factors.
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Claims 5
Claim · model-written summary
Disease indices ranged from 52.6% to 82.7%.
- Taxon
- red clover
Trifolium pratenset0 - Interactor
- Sclerotinia isolatese1pathogen
- Outcome
- Average disease indicese0
- Value
- 52.6% to 82.7%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Average disease indices ranged from 52.6% to 82.7%.”
e1“Sclerotinia isolates isolated from red clover crops”
e2“the disease index was calculated”
t0“red clover crops”
Claim · model-written summary
Disease severity differed significantly among Sclerotinia isolates.
- Taxon
- red cloverTrifolium pratensee1
- Interactor
- Sclerotinia isolatese1pathogen
- Outcome
- disease indexe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant differences were detected between isolates and between cultivars, but there was no isolate--cultivar interaction.”
e1“Sclerotinia isolates isolated from red clover crops”
e2“the disease index was calculated”
Claim · model-written summary
Disease severity differed significantly among red clover cultivars.
- Taxon
- red cloverTrifolium pratensee1
- Material
- cultivarse0
- Interactor
- Sclerotinia isolatese1pathogen
- Outcome
- disease indexe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant differences were detected between isolates and between cultivars, but there was no isolate--cultivar interaction.”
e1“Sclerotinia isolates isolated from red clover crops”
e2“the disease index was calculated”
Claim · model-written summary
There was no isolate–cultivar interaction for disease severity.
- Taxon
- red cloverTrifolium pratensee1
- Interactor
- Sclerotinia isolatese1pathogen
- Outcome
- isolate--cultivar interactione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was no isolate--cultivar interaction.”
e1“Sclerotinia isolates isolated from red clover crops”
e2“the disease index was calculated”
Claim · model-written summary
The most aggressive Sclerotinia isolates can be selected for resistance breeding.
- Taxon
- red cloverTrifolium pratensee1
- Interactor
- Sclerotinia isolatese1pathogen
- Outcome
- most aggressive isolates can be selected for resistance breedinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Based on these results, the most aggressive isolates can be selected for resistance breeding.”
e1“Sclerotinia isolates isolated from red clover crops”
e2“the disease index was calculated”