Abstract
This study aimed to examine the induction of defense responses in tomato elicited by Methylobacterium oryzae CBMB20 as a consequence of reduced stress ethylene level possibly through its ACC deaminase activity. Significantly increased activities of pathogenesis-related (PR) proteins and defense enzymes such as β-1,3-glucanase, phenylalanine ammonia-lyase, peroxidase and polyphenol oxidase were noted in M. oryzae CBMB20 pretreated and challenged with Pseudomonas syringae pv. tomato (Pst) compared to either control or M. oryzae-treated tomato plants in both growth chamber and greenhouse conditions. Increased PR proteins and defense enzyme activities were correlated with the reduction of stress ethylene level. M. oryzae CBMB20 reduced the stress ethylene level about 27% and 55% when challenged with Pst, in growth chamber and greenhouse on day 7 respectively and the effect was comparable to that of the chemical ethylene biosynthesis inhibitor AVG, L-α-(2-aminoethoxyvinyl)-glycine hydrochloride. As a consequence of reduced stress ethylene level and its effect on defense response in crop plants, the disease severity was reduced 26% in M. oryzae CBMB20-treated plants challenged with pathogen. Therefore, inoculation of M. oryzae CBMB20 would induce the defense enzymes and contribute to the enhanced resistance of tomato plants against the pathogen Pst.
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Acknowledgements
The financial support provided by Brain Korea (BK21) through Ph.D. scholarship to P.I is greatly acknowledged. R.A and M.M. are supported by Korea Research Foundation. We acknowledge the partial financial support provided by Rural Development Administration. Critical reading of this paper by the learned referees is thankfully acknowledged.
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Indiragandhi, P., Anandham, R., Kim, K. et al. Induction of defense responses in tomato against Pseudomonas syringae pv. tomato by regulating the stress ethylene level with Methylobacterium oryzae CBMB20 containing 1-aminocyclopropane-1-carboxylate deaminase. World J Microbiol Biotechnol 24, 1037–1045 (2008). https://doi.org/10.1007/s11274-007-9572-7
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DOI: https://doi.org/10.1007/s11274-007-9572-7