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http://dx.doi.org/10.5423/PPJ.2005.21.1.007

Invisible Signals from the Underground: Bacterial Volatiles Elicit Plant Growth Promotion and Induce Systemic Resistance  

Ryu, Choong-Min (Laboratory of Microbial Genomics)
Farag, Mohammed A. (The Samuel Robert Noble Foundation)
Pare, Paul. W. (Department of Biochemistry, Texas Tech University)
Kloepper, Joseph W. (Department of Entomology and Plant Pathology, Auburn University)
Publication Information
The Plant Pathology Journal / v.21, no.1, 2005 , pp. 7-12 More about this Journal
Abstract
Plant growth-promoting rhizobacteria (PGPR) are a wide range of root-colonizing bacteria with the capacity to enhance plant growth and control plant pathogens. Here we review recent progress that indicate some PGPR strains release a blend of volatile organic compounds (VOCs) that promote growth in Arabidopsis seedlings and induce resistance against Erwinia carotovora subsp. carotovora. In particular, the volatile components 2,3-butanediol and acetoin released exclusively from the PGPR strains triggered the greatest level of growth promotion and induced systemic resistance. Pharmacological applications of 2,3-butanediol promoted the plant growth and induced resistance, while bacterial mutants blocked in 2,3-butanediol and acetoin synthesis was devoid of growth-promotion and induced resistance capacities. The results suggested that the bacterial VOCs play a critical role in the plant growth promotion and induced resistance by PGPR. Using transgenic and mutant lines of Arabidopsis, we provide evidences that the signal pathway activated by volatiles from one PGPR strain is dependent on cyto-kinin activation for growth promotion and dependent on an ethylene-signaling pathway for induced pathogen resistance. This discovery provides new insight into the role of bacterial VOCs as initiators of both plant growth promotion and defense responses in plants.
Keywords
bacterial volatiles; induced systemic resistance; PGPR; volatile organic compounds;
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