软腐欧文氏菌对大白菜根毛吸附的专化性

分3个层次测定了软腐欧文氏菌(Erwinia carotovora susp carotovora)对大白菜根毛吸附的专化性.病菌吸附表现出对寄主根毛表面的选择性、病原细菌与寄主问的专化性、吸附菌量在病菌不同菌株和奇主不同品种间的差异.讨论了病菌吸附专化性在寄主-病原物识别中的意义.

SPECIFICIYT IN ADSORPTION OF ERWINIA CAROTOVORA SUBSP CAROTOVORA TO ROOT HAIRS OF CHINESE CABBAGE

The specificity in adsorption of Erwinia carotovora subsp carotovora to root hairs of Chinese cabbage was tested and divided into 3 administrative levels. When 4 kinds of non-living materials were used as adsorbents, only 0. 12%~0. 75% adsorbed bacteria were detected as compared with that on root hairs of Chinese cabbage. No adsorption was found on root hairs of the plant by 3 species of bacteria which are non-pathogenic to Chinese cabbage,and very limited adsorption on the pathogen to the plants which are non-host or inoriginal host. E chrysanthemi, a species of the soft rot group of Erwinia,gave about 30% adsorption on the plant root hairs comparing with the adsorption by E carotovora subsp carotovora. The adsorption differences are also found between E carotovora subsp carotovora and subsp atroseptica,and between the isolates with different phenotypies of subsp carotovora. The amounts of attached bacteria on the root hairs by E carotovora subsp carotovora varied with different cultivars of Chinese cabbage.