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Leaf morphological characteristics and stilbene production differently affect downy mildew resistance of Vitis vinifera varieties grown in Italy

AutorPaolocci, M.; Muganu, M.; Alonso-Villaverde Iglesias, Virginia ; Gindro, Katia
Palabras claveGrape
Plasmopara viticola
Fecha de publicación2014
EditorJulius Kühn-Institut
CitaciónVitis: Journal of Grapevine Research 53 (3): 155-161 (2014)
ResumenThe degree of resistance to downy mildew of grape varieties belonging to the oenological tradition of Central Italy was evaluated by the analysis of plant responses to pathogen infections carried out in natural and controlled environments. Leaf morphological traits, such as hair and stornata! density, were determined for each variety, and the percentage of infected stornata and pathogen colonization of host mesophyll at 24, 48, and 72 hours post inoculation were assessed by epifluorescence microscopy. Furthermore, stilbene production at the site of Plasmopara viticola infection was analyzed at 72 hours post inoculation. Results indicate differences in resistance to downy mildew among selected varieties. Different significant values were detected among grapevines in the percentage of infected stornata and average number of successfully penetrated zoospores per stornata and per leaf surface unit. Differences also emerged in the rate of pathogen growth and stilbene production, signifying that defence mechanisms involved or induced during pathogen infection could be differentially effective among grapevine cultivars in limiting disease progression.
Versión del editorhttp://pub.jki.bund.de/index.php/VITIS/article/view/3960
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