Isolation of fluorescent pseudomonads from the rhizosphere of banana plants antagonistic towards root necrosing fungi

Sutra L., Risède Jean-Michel, Gardan Louis. 2000. Isolation of fluorescent pseudomonads from the rhizosphere of banana plants antagonistic towards root necrosing fungi. Letters in Applied Microbiology, 31 : 289-293.

https://doi.org/10.1046/j.1472-765x.2000.00816.x

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Résumé : Total aerobic bacteria and fluorescent pseudomoonads were counted in bulk and rhizospherie soils of banana plants of 14 plantations in Martinique (French West Indies). Fluorescent #Pseudomonas# isolates were then identified and investigated for #in vitro# antagonism towards #Cylindrocladium# sp., a fungal pathogen of banana roots. Total aerobic bacteria and fluorescent pseudomonads were significantly more abundant in rhizospheric soils than in bulk soils. Among 58 fluorescent #Pseudomonas# isolates, 41 were identified, as #Pseudomonas fluorescens# biovar V and 17 as #Ps. Putida# biovar A. Six strains exhibited an antagonism towards #Cylindrocladium# isolates. Among, them, #Ps. Putida# strain 93.1 totally blocked fungal growth. No relationship was established between the antifungal effect and enzymc or hydrogen cyanide production by bacteria, suggesting that siderophores and other compounds were involved in fungal inhibition. Antagonistic fluorescent pseudomonads represent a potential for the biological control of banana root infections by #Cylindrocladium# sp.

Mots-clés Agrovoc : Musa, rhizosphère, Bacteria, Pseudomonas, fluorescence, racine, nécrose, Cylindrocladium, antagonisme

Mots-clés géographiques Agrovoc : Martinique, France

Classification Agris : H20 - Maladies des plantes
P34 - Biologie du sol

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