Effect of hot water treatment on the fungal community of grapevine nursery-plants | Effet du traitement à l'eau chaude sur les champignons associés aux jeunes plants de vigne
2009
Casieri, L. | Hofstetter, V. | Viret, O. | Dubuis, P.-H. | Gindro, K., Station de recherche Agroscope Changins-Waedenswil ACW, Nyon (Switzerland)
The use of hot water to decontaminate nursery stock from fungal pathogens has been proposed by different authors, but the efficacy of such treatments is still controversial. For instance, some authors reported a complete removal of fungal pathogens after hot water treatment of dormant canes, while others reported no differences in vascular discoloration and pathogen isolation between treated and non-treated dormant cuttings. This study reports the occurrence of fungal species isolated from nursery-plants after hot water treatment (45 minutes at 50 °C). Treated and non-treated plants of five different cultivars were analysed (Chasselas, Gamay, Gamaret, Arvine and Humagne) and the fungal communities were compared between cultivars and among treated and control plants. Great differences among fungal communities living in the different cultivars were observed. Hot water treatment affected the isolation frequency of several species of the fungal community within each cultivar. For instance, several of these species were isolated with a lower frequency compared to the control plants, while other species were isolated only after the treatment. The reduced presence of pathogenic fungi confirms the potentialities of hot water treatment in plant sanitization, but the presence of other plant pathogens raises doubts about the role and interactions of fungal species inside Vitis plants.
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