Dual mode of action of grape cane extracts against Botrytis cinerea
Abstract
Crude extracts of Vitis vinifera canes represent a natural source of stilbene compounds with well characterized antifungals properties. In our trials, exogenous application of a stilbene extract (SE) obtained from grape canes on grapevine leaves reduces the necrotic lesions caused by Botrytis cinerea. The SE showed to possess a direct antifungal activity by inhibiting the mycelium growth. The activation of some grapevine defense mechanism was also investigated. H2O2 production and activation of mitogen-activated protein kinase (MAPK) phosphorylation cascades as well as accumulation of stilbenoid phytoalexins were explored on grapevine cell suspension. Moreover, the transcription of genes encoding for proteins affecting defense responses was analyzed on grapevine plants. The SE induced some grapevine defense mechanisms including MAPK activation, and the expression of pathogenesis-related (PR) genes and of a gene encoding the glutathione-S-transferase 1 (GST1). By contrast, treatment of grapevine leaves with SE negatively regulates de novo stilbene production.
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DOI:
Issue: Enoforum 2021
Type: Article
Authors
1Università di Padova, Dipartimento Territorio e Sistemi Agro-Forestali (TESAF), Viale dell’Università, 16, 35020 Legnaro (PD), Italia
2 Università di Padova, Dipartimento di Agronomia, Animali, Alimenti, Risorse naturali e Ambiente (DAFNAE), Viale dell’Università, 16, 35020 Legnaro (PD), Italia
3Centro di Ricerca Viticoltura ed Enologia (CREA), Via XXVIII Aprile 26, 31015 Conegliano, TV, Italia
4Agroécologie, AgroSup Dijon, CNRS, INRA, Université de Bourgogne, Franche- Comte, F-21000, Dijon, Francia
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Keywords
cane extract, resveratrol, stilbenes, phytoalexin, Botrytis cinerea, grapevine, defense response