Studies on Differentiation of Strains of Xanthomonas axonopodis pv.citri in Guangxi

Abstract:

Thirteen strains isolated from diseased materials of 11 citrus varieties collected from Beihai and Guilin districts were studied.Among 35 physiological characteristics assayed in 13 strains，25 items including citrate，malonate，growth at 36℃，NaCl tolerance，Tween 20，Tween 80，salicin，dulcitol，glucose，lactose，cellubiose，phenylalanine，raffinose，melezitose，adonitol，synanthrin，ribose，mannitol，arabinose，trehalose，melibiose，sorbitol，aesculin，tartrate，gelatin were identical and 10 items including acetate，D-fructose，valerate，rhamnose，xylose，sucrose，maltose，galactose，starch，mannose were different; 12 items including cytochrome C oxidase，catalase，MR，VP，hydrolysis of aesculin，production of levan，reduction of nitrate，production of urease，phenylalanine，arginine dihydrolase，lecithinase，hydrolysis of gelatin identical and 4 items including hydrolysis of starch，production of indole，production of H2S，litmus milk different among 16 biochemical ones in strains.The 13 strains could be differentiated by their sensitivities to 3 phages and be divided into 6 types，while no difference could be detected among the strains by the fatty acid profiles.