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Background    Colletotrichum  and  Fusarium  species are among pathogenic fungi widely affecting  Coffea arabica  L., resulting in major yield loss. In the present study, we aimed to isolate bacteria from root rhizosphere of the same plant that is capable of antagonizing  Colletotrichum gloeosporioides  and  Fusarium oxysporum  as well as promotes plant growth.    Results  A total of 42  Bacillus  species were isolated, one of the isolates named BT42 showed maximum radial mycelial growth inhibition against  Colletotrichum gloeosporioides  (78%) and  Fusarium oxysporum  (86%). BT42 increased germination of  Coffee arabica  L. seeds by 38.89%, decreased disease incidence due to infection of  Colletotrichum gloeosporioides  to 2.77% and due to infection of  Fusarium oxysporum  to 0 ( p  < 0.001). The isolate BT42 showed multiple growth-promoting traits. The isolate showed maximum similarity with  Bacillus amyloliquefaciens .    Conclusion    Bacillus species  (BT42), isolated in the present work was found to be capable of antagonizing the pathogenic effects of  Colletotrichum gloeosporioides  and  Fusarium oxysporum . The mechanism of action of inhibition of the pathogenic fungi found to be synergistic effects of secondary metabolites, lytic enzymes, and siderophores. The major inhibitory secondary metabolite identified as harmine (β-carboline alkaloids).

bmc microbiology

Bacillus species (BT42) isolated from Coffea arabica L. rhizosphere antagonizes Colletotrichum gloeosporioides and Fusarium oxysporum and also exhibits multiple plant growth promoting activity