Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.5/1521
Título: Interactions among grapevine disease-causing fungi. The role of reactive oxygen species
Autor: Oliveira, Helena
Freitas, Regina
Rego, Cecilia
Ferreira, Ricardo Boavida
Palavras-chave: botryosphaeria parva
euthypa lata
phomopsis viticola
wood diseases
grapevine
Data: 2009
Editora: Mediterranean Phytopathological Union
Citação: "Phytopathologia Mediterranea". ISSN 0031-9465. 48 (2009) 117-127
Resumo: Botryosphaeria parva, Eutypa lata and Phomopsis viticola are ascomyceteous fungi responsible for severe canker and dieback in numerous woody plants. In grapevine, these pathogens colonise the wood mainly through pruning wounds, and the diseases gradually develop, leading to partial or total vine death. In the present study, the three fungal species were grown in Czapek Dox modifi ed medium. Under these conditions, fungal colonies are able to distinguish self from non-self. The production of reactive oxygen species (ROS) was analysed by specifi cally staining for superoxide (O2 .-) or peroxide (O2 2-) radicals. The presence of ROS in both isolated cultures and fungal interactions was confi rmed. All fungi produced both radicals, in every interaction. However, the patterns of ROS production depend on the fungus itself and on the fungal species with which it is interacting, being also dependent on the presence of antioxidant compounds in the surrounding medium. It is as though a fungal species hierarchy could be established for every interaction under each set of conditions (i.e. habitat). The results obtained suggest that fungi display more complex behaviours than generally acknowledged. They are able to recognize potential contestants and built up defence reactions, as well as weaken plant defences and structures to induce infection.
URI: http://hdl.handle.net/10400.5/1521
ISSN: 0031-9465
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