Vol. 11, Issue 4 (2022)

Author(s):
Namburi Karunakar Reddy, KVS Meena Kumari and CH Anuradha

Abstract:
Bacterial leaf blight (BLB) disease caused by Xanthomonas oryzae pv. oryzae (Xoo) is one of the most devastating diseases in rice which limits the annual rice production in both tropical and temperate regions of the world. The present study was conducted to isolate, characterize and identify the Xanthomonas oryzae pv. oryzae obtained from infected rice foliar samples. Infected leaf samples were collected from one of the major agro-ecological rice zones in Telangana. Six Xoo isolates collected from different rice growing regions of Telangana were characterized for their reaction to different biochemical tests. The Xoo isolates were gram negative, showed positive reaction for catalase production, oxidase production, Voges Prausker’s test, methyl red test and gelatin liquefaction. The Xoo isolates showed variable reactions with respect to utilization of various carbon sources like maltose, fructose, galactose, mannose, sorbitol, mannitol, adonitol, cellobiose and arabinose. With respect to utilization of various carbon sources the results indicate that there exists variation in physiological characters among the Xoo isolates and this may have impact on their virulence and survival.