Application of endophytic bacterium Bacillus velezensis BTR11 to control bacterial leaf blight disease and promote rice growth

Abstract Background Bacterial leaf blight (BLB) disease caused by Xanthomonas oryzae pv. ( Xoo ) is one of the most destructive pathogens responsible for severe yield losses in rice. Application bacterial biocontrol agent (BCA) with plant growth promotion (PGP) abilities a promising method that alternates current conventional practices to manage BLB and increase crop yield. Hence, this study aimed isolate identify BCA PGP from internal tissues rhizosphere soil healthy -infected rice evaluate their antagonistic properties under greenhouse field conditions. Results A total 14 isolates were isolated presented vitro ability against Xoo. The endophytic bacterium strain Bacillius velezensis BTR11) had highest activity , produced indole acetic acid (IAA), mineralized nutrients (K P). experiment revealed culture broth BTR11 high protective effect (72.1%) when applied at protective-fighting mode, i.e., before after infection. Preliminary results showed was obtained as 75–85%, if used an additive seedlings combination spraying began field. In addition, using also increased about 12% more than un-treatment control. Conclusions significant potential application bacteria controlling disease, while stimulating growth, thus reducing use agrochemicals cultivation.