Thürig, Barbara; Binder, Andres; Boller, Thomas; Guyer, Urs; Jiménez, Sonia; Rentsch, Christina and Tamm, Lucius (2006) An aqueous extract of the dry mycelium of Penicillium chrysogenum induces resistance in several crops under controlled and ﬁeld conditions. European Journal of Plant Pathology (114), pp. 185-197.
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We have examined the effect of Pen, an aqueous extract of the dry mycelium of Penicillium chrysogenum, on plant–pathogen interactions. Pen controlled a broad range of pathogens on several crop plants under greenhouse and ﬁeld conditions. Pen protected grapevine from downy and powdery mildew (caused by Plasmopara viticola and Uncinula necator), tomato from early blight (caused by Phytophthora infestans), onion from downy mildew (Peronospora destructor) and apple trees from apple scab (caused by Venturia inaequalis) to a similar extent as fungicides such as copper and sulphur or well-known inducers such as benzothiadiazole or b-aminobutyric acid. Pen had no major direct fungicidal eﬀect and is thus supposed to protect plants by activating their defense mechanisms. The raw material for extraction of Pen was available in constant quality, a prerequisite for commercial application. Under certain conditions, Pen caused phytotoxic side effects. The symptoms mostly consisted of small necrotic spots or, more rarely, of larger necrotic areas. The development of the symptoms was dependent on several parameters, including concentration of Pen, the number of applications, the persistence on the plant tissue, the plant species and variety and environmental conditions. In grapevine, a partially puriﬁed fraction of Pen was much less toxic than the crude Pen extract, but protected the plants to a similar extent against P. viticola. Our data show that Pen has interesting and unique properties as a plant protection agent, but more research is needed to further reduce its phytotoxic side effects.
|EPrint Type:||Journal paper|
|Keywords:||Pflanzenschutz, Pflanzenkrankheiten, Resistenzmechanismen Pflanzen, PEN, Phythopathologie, apple tree, grapevine, induced resistance, Phytophthora infestans, Plasmopara viticola, tomato|
|Subjects:|| Crop husbandry > Crop health, quality, protection|
Crop husbandry > Production systems > Vegetables
Crop husbandry > Production systems > Fruit and berries > Viticulture
Crop husbandry > Production systems > Fruit and berries
|Research affiliation:||Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland > Plant Protection and Biodiversity|
|Deposited By:||Tamm, Dr. Lucius|
|Deposited On:||23 Aug 2006|
|Last Modified:||12 Apr 2010 07:33|
|Refereed:||Peer-reviewed and accepted|
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