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Environment and Plant Protection Institute, CATAS/Ministry of Agriculture Key Laboratory for Monitoring and Control of Tropical Agricultural and Forest Invasive Alien Pests/Hainan Key Laboratory for Detection and Control of Tropical Agricultural Pests, Haikou, Hainan 571101, China;
2.
College of Environment and Plant Protection, Hainan University, Haikou, Hainan 5702283, China;
3.
Opening Project Fund of Key Laboratory of Rubber Biology and Genetic Resource Utilization, Ministry of Agriculture/State Key Laboratory Breeding Base of Cultivation & Physiology for Tropical Crops/Danzhou Investigation & Experiment Station of Tropical Crops, Ministry of Agriculture, Danzhou, Hainan 571737, China
Activities of polyphenol oxidase (PPO), peroxidase (POD), superoxide dismutase (SOD), phenylalanine ammonia lyase (PAL), and catalase (CAT) in sugarcane leaves were determined to evaluate the efficiency of a biocontrol bacterium, TB2, in inducing these disease-resisting enzymes, as well as the correlation between the enzymes and the disease resistance of sugarcane toward red rot pathogens. Treatments, including pathogen inoculation,TB2 spraying, and TB2 sprayings before and after pathogen inoculation, were applied to examine the variations on the enzymatic activities in the leaves of the treated sugarcane plants.It was found that the enzymatic activities in the treated plants were significantly higher than those in control, indicating an induction effect byeither TB2 or the red rot pathogens. The effect was greater when TB2 was applied along with the pathogenic inoculation, especiallyif the leaves were pre-sprayed with TB2.Although the biocontrol bacterium showed a stronger induction ability than the pathogens, a synergism seemed evidentwhen both were present on sugarcane.
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