柑桔溃疡病菌胞外产物在拌种灵与菌体互作中的作用

EFFECT OF EXTRACELLULAR SECRETIONS ON INTERACTION OF Xanthomonas citri WITH SEEDWAX

柑桔溃疡病原细菌的胞外产物 ,在拌种灵与病原菌互作过程中具有一定的调控作用。胞外产物尤其是胞外粘多糖 ( EPS) ,对拌种灵具有很强的拮抗作用 ;经药剂处理的病原菌 ,其胞外产物如 :电解质、EPS、胞外蛋白、以及胞外水解酶等 ,其产量和生物活性都呈现出一定规律的变化。研究表明 ,病原菌在药剂处理下 ,可通过胞外产物的变化产生一定的抗逆反应。

Studies showed that extracellular secretions of Xanthomonas citri had certain abilities to regulate the interaction between the bacterium and Seedwax, a fungicide. The secretions, especially extracellular polysaccharide (EPS), could strongly antagonize the inhibition of Seedwax. Output of electrolyte, EPS, extracellular protein, and bioactivity of extracellular hydrolytic enzymes are regularized to vary with the concentration of Seedwax. The results indicated that the pathogenic bacteria possess an active echo to the adverse environment by chan ging the attributions of extracellular secretions when surrounded by fungicides.