title: Sweet scents from good bacteria: Case studies on bacterial volatile compounds for plant growth and immunity.
abstract: Beneficial bacteria produce diverse chemical compounds that affect the behavior of other organisms including plants. Bacterial volatile compounds (BVCs) contribute to triggering plant immunity and promoting plant growth. Previous studies investigated changes in plant physiology caused by in vitro application of the identified volatile compounds or the BVC-emitting bacteria. This review collates new information on BVC-mediated plant-bacteria airborne interactions, addresses unresolved questions about the biological relevance of BVCs, and summarizes data on recently identified BVCs that improve plant growth or protection. Recent explorations of bacterial metabolic engineering to alter BVC production using heterologous or endogenous genes are introduced. Molecular genetic approaches can expand the BVC repertoire of beneficial bacteria to target additional beneficial effects, or simply boost the production level of naturally occurring BVCs. The effects of direct BVC application in soil are reviewed and evaluated for potential large-scale field and agricultural applications. Our review of recent BVC data indicates that BVCs have great potential to serve as effective biostimulants and bioprotectants even under open-field conditions.
authors.affiliation: Molecular Phytobactriology Laboratory, KRIBB, Daejeon, 305-806, South Korea.|Biosystems and Bioengineering Program, University of Science and Technology (UST), Yuseong-gu, Daejeon, 305-333, South Korea.
authors.forename: Joon-hui
authors.initials: JH
authors.lastname: Chung
authors.affiliation: Molecular Phytobactriology Laboratory, KRIBB, Daejeon, 305-806, South Korea.
authors.forename: Geun Cheol
authors.initials: GC
authors.lastname: Song
authors.affiliation: Molecular Phytobactriology Laboratory, KRIBB, Daejeon, 305-806, South Korea. cmryu@kribb.re.kr.|Biosystems and Bioengineering Program, University of Science and Technology (UST), Yuseong-gu, Daejeon, 305-333, South Korea. cmryu@kribb.re.kr.
authors.forename: Choong-Min
authors.initials: CM
authors.lastname: Ryu
mesh_terms: D000093:Acetoin / Q000378:metabolism; D001419:Bacteria / Q000235:genetics / Q000378:metabolism*; D002072:Butylene Glycols / Q000378:metabolism; D060467:Disease Resistance; D060847:Metabolic Engineering; D063245:Plant Development; D010935:Plant Diseases / Q000276:immunology / Q000382:microbiology; D010944:Plants / Q000276:immunology* / Q000382:microbiology*; D055549:Volatile Organic Compounds / Q000378:metabolism*
chemical_list: D002072:Butylene Glycols; D055549:Volatile Organic Compounds; C026978:2,3-butylene glycol; D000093:Acetoin
keywords: 2,3-butanediol; Bacterial volatile compound; Induced systemic resistance; Metabolic engineering; Plant growth-promoting rhizobacteria