Evaluation on the Control Effects of Bacillus velezensis BQ against Codonopsis pilosula Root Rot
Bacillus velezensis BQ was regarded as the newly discovered potential biocontrol bacteria,and its control effects on root disease of Codonopsis pilosula was studied by the dual confrontation test,spore germination,biological control mechanism and in vitro control test.The results of the dual confrontation test showed that Bacillus velezensis BQ could obviously inhibit the growth of Fusarium oxysporum DS,the mycelium growth inhibition rate reached 50.55%,and the mycelium in the confrontation area was obviously deformed.The results of spores germination showed that the metabolites of Bacillus velezensis BQ could effectively inhibit the spores germination of pathogen DS.The metabolites of Bacillus velezensis BQ could increase the permeability of cell membrane of pathogenic bacteria DS,which led to the increase of nucleic acid release and cell rupture to death.In vitro control results showed that Bacillus velezensis BQ had a therapeutic effect of 46.13%and a preventive effect of 63.62%on Codonopsis pilosula root rot.Bacillus velezensis BQ has the potential to control Codonopsis pilosula root rot and can be developed as a biological control agent.