【摘要】 在番茄四叶期用1mg/mL的壳聚糖进行诱导接种,可诱导番茄植株产生对早疫病的抗病性.经壳聚糖诱导后,3个番茄品种:合作908(高抗)、合作903(中抗)、早丰(敏感)的病叶率和病情指数均显著低于接种对照,相对防效分别为39.8%、49.9%和56.4%;壳聚糖诱导番茄的叶片过氧化物酶(POD)、多酚氧化酶(PPO)、苯丙氨酸解氨酶(PAL)、几丁质酶、β-1,3-葡聚糖酶活性提高,诱导活性在不同抗性品种中表现不同,不同酶的时序变化也有所不同,并探讨了壳聚糖诱导植物抗病性的生理机制.更多还原

【Abstract】 Resistance to early blight of the tomato plants was induced by chitosan (1 mg/mL) at the fourthleaf stage of seedlings Chitosan treatment of tomato leaves before inoculation reduced the rates of diseased leaf and disease index The relative efficiencies of resistance in cultivars were Hezuo908 (highly resistant), Hezuo903 (moderately resistant), and Zaofeng (least resistant) As a consequence of the treatments, the activities of peroxidase (POD), polyphenol oxidase (PPO), phenylalanine ammonia lyase(PAL), chitinase, and β1,3glucanase in tomato leave increased but in different degrees with different cultivars The time courses of change in enzyme activities following chitosan treatment were also different The mechanism of induced resistance of chitosan was disscussed更多还原