Telluric plant pathogens are responsible for severe damages on several crops and their control by synthetic fungicides besides being difficult may cause technical, economical, toxicological and environmental problems. In the last years, among alternative options for an efficient and sustainable management of these pathogens, biocontrol agents and/or organic amendments seem to be very promising. Our research were aimed at evaluating in vitro and in vivo the effect of two selected biocontrol bacteria (Bacillus amyloliquefaciens BO7 and Burkholderia cepacia BTd1) on the repressiveness against soilborne fungal pathogens of some commercial or experimental organic amendments, naturally-derived from grape marcs, olive husks, fowl-manure, cow manure or green pruning residues. The capacity of biocontrol bacteria to colonize and survive in each organic matrix was also assessed. The addition of the antagonist bacteria appreciably improved the repressiveness of some amendments; further the biocontrol agents evidenced a good ecological fitness since survive in the amendments at high level of population. Investigations, were also carried out in order to elucidate the mechanisms involved in the antifungal activity expressed by the best combination biocontrol agent-amendment. The results of our investigations are discussed in relation to the potential use of bacterial enriched amendment for a more efficient and eco-compatible control of soilborne plant pathogens.
Effect of biocontrol bacteria on repressiveness of organic amendments against fungal plant pathogens in the rhizosphere
LIMA, Giuseppe;DE CURTIS, Filippo;
2010-01-01
Abstract
Telluric plant pathogens are responsible for severe damages on several crops and their control by synthetic fungicides besides being difficult may cause technical, economical, toxicological and environmental problems. In the last years, among alternative options for an efficient and sustainable management of these pathogens, biocontrol agents and/or organic amendments seem to be very promising. Our research were aimed at evaluating in vitro and in vivo the effect of two selected biocontrol bacteria (Bacillus amyloliquefaciens BO7 and Burkholderia cepacia BTd1) on the repressiveness against soilborne fungal pathogens of some commercial or experimental organic amendments, naturally-derived from grape marcs, olive husks, fowl-manure, cow manure or green pruning residues. The capacity of biocontrol bacteria to colonize and survive in each organic matrix was also assessed. The addition of the antagonist bacteria appreciably improved the repressiveness of some amendments; further the biocontrol agents evidenced a good ecological fitness since survive in the amendments at high level of population. Investigations, were also carried out in order to elucidate the mechanisms involved in the antifungal activity expressed by the best combination biocontrol agent-amendment. The results of our investigations are discussed in relation to the potential use of bacterial enriched amendment for a more efficient and eco-compatible control of soilborne plant pathogens.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
