Use of two bacteria for biological control of bayoud disease caused by Fusarium oxysporum in date palm (Phoenix dactylifera L) seedlings

摘要: The Bayoud, caused by Fusarium oxysporum f. sp. albedinis (Foa), is the most destructive disease of date palm (Phoenix dactylifera L) in Morocco and Algeria, with no effective control strategy yet available. In this work, two bacteria, Bacillus amyloliquefaciens strain Ag1 (Ag) Burkholderia cepacia Cs5 (Cs), were examined for their potential to disease. Both bacterial strains inhibited both growth sporulation Foa. They released compounds into culture medium, which resulted cytological changes Foa's mycelial structure. When Jihel-date plantlets, a susceptible cultivar, induced these size necrosis zone, reflected spreading pathogen, was reduced more than 70%, as compared uninduced controls. To further investigate mechanisms such reduction, phenolic peroxidase activity assessed. One month after inoculation, defense reactions against Foa different depending on bacterium used, B. led higher accumulation constitutive caffeoylshikimic acid isomers while triggered induction new identified hydroxycinnamic derivatives. Peroxidase has also been stimulated significantly varied used inoculation. These results add promising field investigation controlling Bayoud