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KMID : 0545120050150051073
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Journal of Microbiology and Biotechnology
2005 Volume.15 No. 5 p.1073 ~ p.1079
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Quantitative Changes of Plant Defense Enzymes in Biocontrol of Pepper (Capsicium annuum L.) Late Blight by Antagonistic Bacillus subtilis HJ927
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Lee HJ
Park KH/Shim JH/Park RD/Kim YW/Cho JY/HwangBo H/Kim YC/Cha GS/Krishnam HB/Kim KY
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Abstract
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To investigate plant protection, pathogenesisrelated (PR) proteins and plant defense enzymes related to cell wall lignification were studied in pepper plants inoculated with antagonistic Bacillus subtilis HJ927 and pathogenic strain Phytophthora capsici. Phytophthora blight disease was reduced by 53% in pepper roots when preinoculated with B. subtilis HJ927 against P. capsici. The activities of PR proteins (chitinase and β-1,3,-glucanase) and defense-related enzymes (peroxidase, polyphenoloxidase, and phenylalanine ammonia lyase) decreased in roots of B. subtilis+P. capsici-treated plants, but increased in leaves with time. The decrease and increase were much greater in P. capsici-treated plants than in B. subtilis HJ927+P. capsici-treated plants, although P. capsicitreated plants had more severe damage. Therefore, changes of enzyme activities do not seem to be directly related to plant protection. We suggest that the change of these enzymes in pathogen-treated plants may be related to plant response rather than to resistance against pathogen attacks.
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