Ellen Pauwelyn

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Production of biosurfactants is a common feature in bacteria, and in particular in plant-associated species. These bacteria include many plant beneficial and plant pathogenic Pseudomonas spp., which produce primarily cyclic lipopeptide and rhamnolipid type biosurfactants. Pseudomonas-derived biosurfactants are involved in many important bacterial functions.(More)
Bacterial midrib rot of greenhouse-grown butterhead lettuce (Lactuca sativa L. var. capitata) is an emerging disease in Flanders (Belgium) and fluorescent pseudomonads are suspected to play an important role in the disease. Isolations from infected lettuces, collected from 14 commercial greenhouses in Flanders, yielded 149 isolates that were characterized(More)
Pseudomonas cichorii is the causal agent of lettuce midrib rot, characterized by a dark-brown to green-black discoloration of the midrib. Formation of necrotic lesions by several plant-pathogenic pseudomonads is associated with production of phytotoxic lipopeptides, which contribute to virulence. Therefore, the ability of P. cichorii SF1-54 to produce(More)
The lettuce midrib rot pathogen Pseudomonas cichorii SF1-54 produces seven bioactive compounds with biosurfactant properties. Two compounds exhibited necrosis-inducing activity on chicory leaves. The structure of the two phytotoxic compounds, named cichopeptin A and B, was tentatively characterized. They are related cyclic lipopeptides composed of an(More)
Prevention of environmental risk due to pesticide application is demanded by EU legislation regarding water and crop protection issues. The pesticide users are required to take responsibility for the environmental consequences of applications. Therefore they need to make responsible decisions at both strategic and tactical level. The first one is a long(More)
Downy mildew, caused by the oomycete Bremia lactucae, is a devastating disease of lettuce, which is controlled by applying fungicides and/or planting resistant lettuce cultivars. As resistance of lettuce cultivars is based on gene-for-gene interaction and offers mostly short-term protection, a lot of effort is put in breeding new resistant lettuce(More)
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