Disulfooxy fatty acids from the American bird grasshopper Schistocerca americana, elicitors of plant volatiles.
A previously unidentified class of compounds has been isolated from the regurgitant of the grasshopper species Schistocerca americana. These compounds (named here "caeliferins") are composed of saturated and monounsaturated sulfated alpha-hydroxy fatty acids in which the omega-carbon is functionalized with either a sulfated hydroxyl or a carboxyl conjugated to glycine via an amide bond. The regurgitant contains a series of these compounds with fatty acid chains of 15-20 carbons and in varying proportions. Of these, the 16-carbon analogs are predominant and are also most active in inducing release of volatile organic compounds when applied to damaged leaves of corn seedlings. Caeliferins are nonlepidopteran elicitors identified in insect herbivores. This adds a category of insect herbivore-produced elicitors of plant responses, providing further evidence of the ability of plants to detect and respond to a broad range of insect herbivore-produced compounds.
Alborn
Hans T
HT
Center for Medical, Agricultural, and Veterinary Entomology, United States Department of Agriculture, 1600/1700 Southwest 23rd Drive, Gainesville, FL 32608, USA. hans.alborn@ars.usda.gov
Hansen
Trond V
TV
Jones
Tappey H
TH
Bennett
Derrick C
DC
Tumlinson
James H
JH
Schmelz
Eric A
EA
Teal
Peter E A
PE
D000818:Animals; D002851:Chromatography, High Pressure Liquid; D005227:Fatty Acids / Q000737:chemistry* / Q000502:physiology; D006110:Grasshoppers / Q000502:physiology*; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D009930:Organic Chemicals / Q000378:metabolism*; D010944:Plants / Q000378:metabolism*; D036226:Seedlings / Q000378:metabolism; D014835:Volatilization; D003313:Zea mays / Q000378:metabolism
D005227:Fatty Acids; D009930:Organic Chemicals