Eudesmane Sesquiterpenes from Verbesina lanata with Inhibitory activity against grapevine Downy Mildew
An in-house library of more than 3000 extracts of plant and fungal origin was screened against some major plant pathogens. As one of the hits, an ethyl acetate extract from inflorescences of Verbesina lanata showed significant inhibitory activity in vitro against grapevine downy mildew (Plasmop...
| Autores Principales: | Ramseyer, Justine, Thuerig, Barbara, De Mieri, Maria, Scharer, Hans-Jakob, Oberhansli, Thomas, Gupta, Mahabir P., Tamm, Lucius, Hamburger, Matthias, Potterat, Olivier |
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| Formato: | Artículo |
| Idioma: | Español |
| Publicado: |
2017
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| Materias: | |
| Acceso en línea: |
http://up-rid.up.ac.pa/6914/ http://up-rid.up.ac.pa/6914/1/justine_ramseyer.pdf |
| Sumario: |
An in-house library of more than 3000 extracts
of plant and fungal origin was screened against some major
plant pathogens. As one of the hits, an ethyl acetate extract
from inflorescences of Verbesina lanata showed significant
inhibitory activity in vitro against grapevine downy mildew
(Plasmopara viticola), with a MIC100 value of 35 μg/mL. An
emulsifiable concentrate formulation with 50 mg/g of the
extract was developed for in vivo evaluation. A suspension of
the formulation containing 1 mg/mL of extract lowered leaf
surface infection of grapevine seedling by 82% compared to
the nontreated control. With the aid of HPLC-based activity profiling, the antifungal activity was correlated with a series of
lipophilic compounds. Preparative isolation by a combination of chromatographic techniques afforded 16 eudesmane
sesquiterpenes including eight new congeners. Nine compounds were obtained in sufficient quantities to be tested in vitro and were found to inhibit the zoospore activity of P. viticola with MIC100 values ranging from 4 to 50 μg/mL. The two majorcompounds, 6β-cinnamoyloxy-4β,9β,15-trihydroxyeudesmane (9) and 6β-cinnamoyloxy-1β,15-dihydroxyeudesm-4-en-3-one(13), showed MIC100 values of 5 and 31 μg/mL, respectively |
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