Journal
BIOCONTROL SCIENCE AND TECHNOLOGY
Volume 26, Issue 10, Pages 1366-1378Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09583157.2016.1205181
Keywords
Xanthomonas campestris pv. Vesicatoria; bacterial spot; Bacillus subtilis; biological control; defence-related enzymes
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Funding
- KU Brain Pool of Konkuk University, Seoul, Republic of Korea
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Bacterial spot disease caused by Xanthomonas campestris pv. vesicatoria is one of the most important destructive diseases of tomato in many parts of the agricultural world. Therefore, the present study aims to determine the effects of Bacillus subtilis CBR05 inoculation on bacterial spot disease severity and the induction of defence-related enzymes response in tomato. Tomato leaves were evaluated to determine the activities of antioxidant enzymes (superoxide dismutase (SOD), catalase (CAT), peroxidase (POD), and polyphenol oxidase (PPO)) and the content of malondialdehyde (MDA). A reduction in bacterial spot severity was observed in plants inoculated with B. subtilis, compared with those of uninoculated controls. A significant increase in SOD, CAT, POD, and PPO activities was observed in plants treated with B. subtilis after 24 h inoculation compared with non-inoculated pathogen control and mock-inoculated controls. Moreover, the MDA content was induced by pathogen infection, and its amount in B. subtilis inoculated plants was significantly lower than that in pathogen control. Our results suggest that early increases in antioxidant enzymes and the reduction in MDA content with B. subtilis inoculation may play a pivotal role in mitigating oxidative stress, thereby induced systemic resistance against bacterial spot disease in tomato.
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