Assessment of root-associated paenibacillus polymyxa groups on growth promotion and induced systemic resistance in pepper

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Title
Assessment of root-associated paenibacillus polymyxa groups on growth promotion and induced systemic resistance in pepper
Author(s)
Q T Phi; Y M Park; K J Seul; Choong-Min Ryu; Seung Hwan Park; J G Kim; S Y Ghim
Bibliographic Citation
Journal of Microbiology and Biotechnology, vol. 20, no. 12, pp. 1605-1613
Publication Year
2010
Abstract
Twenty-nine P. polymyxa strains isolated from rhizospheres of various crops were clustered into five genotypic groups on the basis of BOX-PCR analysis. The characteristics of several plant growth-promoting factors among the isolates revealed the distinct attributes in each allocated group. Under gnotobiotic conditions, inoculation of pepper roots with P. polymyxa isolates significantly increased the biomass in 17 of total 29 treated plants with untreated plants. Experiments on induced systemic resistance (ISR) against bacterial spot pathogen Xanthomonas axonopodis pv. vesicatoria in pepper by P. polymyxa strains were conducted and only one isolate (KNUC265) was selected. Further studies into ISR mediation by the KNUC265 strain against the soft-rot pathogen Erwinia carotovora subsp. carotovora in tobacco demonstrated that the tobacco seedlings exposed to either bacterial volatiles or diffusible metabolites exhibited a reduction in disease severity. In conclusion, ISR and plant growth promotion triggered by P. polymyxa isolates were systemically investigated on pepper for the first time. The P. polymyxa KNUC265 strain, which elicited both ISR and plant growth promotion, could be potentially used in improving the yield of pepper and possibly of other crops.
Keyword
Erwinia carotovoraISRPaenibacillus polymyxaPGPRXanthomonas axonopodis
ISSN
1017-7825
Publisher
South Korea
DOI
http://dx.doi.org/10.4014/jmb.1007.07014
Type
Article
Appears in Collections:
Division of Research on National Challenges > Infectious Disease Research Center > 1. Journal Articles
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