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Treatment of Paenibacillus illinoisensis suppresses the activities of antioxidative enzymes in pepper roots caused by Phytophthora capsici infection

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Summary

The activity of antioxidative enzymes after inoculation of pepper (Capsicum annuum L. Chungok) with a pathogen, Phytophthora capsici (P), the causal agent of Phytophtora blight and dual inoculation of pathogen and an antagonist, Paenibacillus illinoisensis KJA-424 (P+A), were measured and compared with that of non-inoculated (C) roots. Root mortality was significantly reduced by about 84% in P+A treatment compared with P treatment alone. When compared to the non-inoculated (C) roots, malondialdehyde (MDA) concentration gradually decreased by 52.4% in 7 days only in P-treated roots and hydrogen peroxide (H2O2) was not significantly affected by the treatment for 5 days but significantly decreased in the P+A-treated roots at day 7. P-treatment continuously induced peroxidase (POD) and superoxide dismutase (SOD), resulting in significant increases of 36.7% and 27.7% at day 7, respectively, compared to the control. In P+A-treated roots, the activities of POD and SOD also increased for 5 days but returned to the control level at day 7. Catalase activity fluctuated but again increased over the 7-day period following P+A inoculation. These results indicate that an antagonist P. illinoisensis KJA-424 alleviated root mortality and suppressed the elevated activities of POD and SOD in the root of pepper plant root caused by P.␣capsici infection.

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Acknowledgements

This work was supported by National Research Laboratory (NRL) program (to Dr R. D. Park) from the Ministry of Science & Technology (MOST), and by Korea Science and Engineering Foundation (KOSEF) through the Agricultural Plants Stress Research Center (APSRC) at Chonnam National University.

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Correspondence to T. H. Kim.

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Jung, W.J., Jin, Y.L., Park, R.D. et al. Treatment of Paenibacillus illinoisensis suppresses the activities of antioxidative enzymes in pepper roots caused by Phytophthora capsici infection. World J Microbiol Biotechnol 22, 901–907 (2006). https://doi.org/10.1007/s11274-006-9131-7

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  • DOI: https://doi.org/10.1007/s11274-006-9131-7

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