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

Egyptian Journal of Biological Pest Control

Table 3 In vitro screening for antagonistic activity and siderophore production of bacteria isolated from plant tissues (root, leaf) and rhizosphere soils of healthy and bacterial leaf blight (BLB) disease-infected rice

No	Bacteria isolates	Plant condition	Diameter of antagonistic halozone (mm)	Siderophore production
1	BTR1	Healthy rice	6.15 ± 0.53	−
2	BTS3		13.32 ± 1.21	+
3	BTL4		7.61 ± 0.74	+
4	BTL5		11.23 ± 0.65	−
5	BTL6	BLB-diseased rice	7.35 ± 0.58	−
6	BTR3		13.41 ± 0.81	–
7	BTR6		14.13 ± 0.73	+
8	BTS10		8.24 ± 1.41	+
9	BTS2		6.38 ± 0.93	+ +
10	BTR10		15.27 ± 0.58	−
11	BTL7		7.61 ± 0.67	−
12	BTL8		18.13 ± 0.82	+
13	BTL9		14.16 ± 1.03	+ +
14	BTR11		21.15 ± 0.97	+ +

Data were value ± SD (n = 3). Samples: R, root tissues; L, leaf tissues; S, rhizosphere soil. BLB, bacterial leaf blight; Xoo, Xanthomonas oryzae pv. oryzae. BT: Bac thom rice variety. Halozone diameter (mm) for siderophores production: ++, 16–25 mm; +, 5–15 mm; −, no siderophores