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Ingadosides A-C, acacic acid-type saponins from Inga sapindoides with potent inhibitory activity against grapevine downy mildew as potential alternatives to copper fungicides

Tamm, Lucius; Heng, Ming Yuan; Thürig, Barbara; Danton, Ombeline; Ramseyer, Justine; Gupta, Mahabir P.; Hamburger, Matthias; Potterat, Olivier and Oberhänsli, Thomas (2023) Ingadosides A-C, acacic acid-type saponins from Inga sapindoides with potent inhibitory activity against grapevine downy mildew as potential alternatives to copper fungicides. In: The International Society for Plant Pathology, The French Phytopathological Society (Eds.) 12th International Congress of Plant Pathology. Book of Abstract ICPP, pp. 935-936.

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Document available online at: https://www.icpp2023.org/programme/abstracts-book


Summary in the original language of the document

The reduction of copper-based fungicides has a high priority in European policy as well as in organic agriculture. To successfully reduce copper use, preventive strategies have to be fully implemented, and several substitution products need to be brought to the market. Plantderived plant protection products could provide sustainable and environmentally friendly alternatives. As part of a project aiming at the discovery of such new products, we screened a library of more than 3000 plant extracts against important plant pathogens. One of the extracts with promising activity against grapevine downy mildew (Plasmopara viticola) was an 96% ethanolic extract from the leaves of Inga sapindoides (in vitro MIC100 25 μg/mL). On grapevine plantlets under controlled conditions, compared to non-treated plants, the I.sapindoides ethanolic extract reduced grapevine downy mildew by 96%-97% at 0.5 mg/mL, and its efficacy was comparable to a standard copper treatment (two independent experiments). Targeted isolation of the active constituents resulted in the characterization of three acacic acid-type bidesmosidic saponins with high antifungal activity (in vitro MIC100 values of 3 - 6 μg/mL). I. sapindoides, a tree which is often cultivated for shading coffee plantations in Central America, may represent a sustainable source of fungicidal products to be used in the replacement of copper.


EPrint Type:Conference paper, poster, etc.
Type of presentation:Poster
Keywords:grapevines, plant diseases, Abacus, FiBL25024, Coop Kupferersatz
Agrovoc keywords:
Language
Value
URI
English
grapevines
http://aims.fao.org/aos/agrovoc/c_3360
English
plant diseases
http://aims.fao.org/aos/agrovoc/c_5962
Subjects: Knowledge management > Research methodology and philosophy > Specific methods
Crop husbandry > Crop health, quality, protection
Crop husbandry > Production systems > Fruit and berries > Viticulture
Research affiliation: Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland > Crops > Crop protection
Switzerland > University of Basel
Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland > Crops > Special crops > Fruit
Panama
Deposited By: Forschungsinstitut für biologischen Landbau, FiBL
ID Code:51930
Deposited On:07 Nov 2023 12:15
Last Modified:27 Nov 2023 08:31
Document Language:English
Status:Published
Refereed:Not peer-reviewed

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