Abstracts
Abstract
Erwinia amylovora causes fire blight mainly on pear, apple and quince trees. This bacterial pathogen also infects other Rosaceous plants, such as blackberry and raspberry. A race structure was established between an isolate of E. amylovora and berries using 40 wild blackberry and 7 wild raspberry genotypes. In pathogenicity tests, wild blackberry and raspberry genotypes had three phenotypic reactions: enhanced susceptibility, moderate susceptibility and resistance. We noted a higher bacterial growth of over 300 × 109 cfu mL-1 in plants with enhanced susceptibility, with resistant genotypes showing a bacterial growth of around 150 × 109 cfu mL-1. These results are also associated with symptoms observed at 29 days post-inoculation. This resistance is being evaluated to control fire blight.
Keywords:
- fire blight,
- resistance,
- wild blackberry,
- wild raspberry
Résumé
Erwinia amylovora est responsable de la brûlure bactérienne principalement chez la poire, la pomme et le coing. Cet agent pathogène bactérien infecte également d’autres plants de Rosaceous, comme les mûriers et les framboisiers. Une structure de race a été établie entre un isolat de E. amylovora et ces baies en utilisant 40 génotypes de mûrier sauvage et 7 de framboisier sauvage. Lors de tests de pathogénicité, les génotypes de mûrier et framboisier sauvages ont montré trois réactions génotypiques, soit une sensibilité accrue, une sensibilité intermédiaire et de la résistance. Nous avons noté une plus grande croissance bactérienne de plus de 300 × 109 cfu mL-1 chez les plants avec une sensibilité accrue, alors que les génotypes résistants montraient une croissance bactérienne d’environ 150 × 109 cfu mL-1. Ces résultats sont également liés aux symptômes observés 29 jours après l’inoculation. Cette résistance fait l’objet d’évaluation pour la lutte à la brûlure bactérienne.
Mots-clés :
- brûlure bactérienne,
- framboisier sauvage,
- mûrier sauvage,
- résistance
Appendices
References
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