Abstract:
The research was conducted to identify the bacterial
endophytes from rice leaf sheath against Rhizoctonia
solani that caused sheath blight disease of rice. This
study was done in the Mycology and Advanced
Nematology Laboratory of the Department of Plant
Pathology, Sher-e-Bangla Agricultural University.
Twelve R. solani isolates were collected from six
upazilas of Bangladesh. Among twelve isolates,
RSRPS11 showed the highest relative lesion height
(30.66%) on BRRI Dhan 34 in pot. The highest disease
severity (20.45%) was also recorded for isolate
RSRPS11. Eight bacterial endophytes were isolated
from healthy leaf sheaths of rice from these six areas.
Endophytic bacteria showed creamy, milky white,
creamy yellow, orange yellow, and pale white colonies
in color. Colony size variation was also observed. At 7
days of dual culture with R. solani, five isolates
showed no inhibition, and Iso-4 produced the highest
(51.11 %) inhibition zone. These strains of R. solani
and the potential bacterial endophyte could be used in
future research of sheath blight disease management.
