STUDY ON THE HOST BIOLOGICAL INDUCED RESISTANCE OF BACTERIAL CANKER OF POPLAR

This is the first time that biological induced resistance has been used in the research of the bacterial canker on poplar. After inoculated with less-aggressive strains, middle-aggressive strains and non-aggressive strains (high-aggressive strains have been treated with 400W ultraviolet lamp for 30 min on super-clean working table) poplar seedlings have been inoculated with high-aggressive strams. the results of those experiments shown that strain 3 (from Suihua, Heilongjiang)and strain 9 (from Liaoning) can significantly enhance the activities of the peroxidase of host. and the efects of twice inoculation were much better than that of once inoculation. 7. 1 % and 4.0% of the peroxidase activities have been enhanced respectively in the seedlings which were twice inoculation with strains 3 and strains 9. 1. 1 % and 1 .2 % of the peroxidase activities have been enhanced by inoculated strains 3 and strains 9 once into seedlings.