« Previous AbstractIn-Cabin Air Quality during Driving and Engine Idling in Air-Conditioned Private Vehicles in Hong Kong    Next AbstractEnhanced Yield of Pepper Plants Promoted by Soil Application of Volatiles From Cell-Free Fungal Culture Filtrates Is Associated With Activation of the Beneficial Soil Microbiota »

J Chem Ecol

Title:		Isolation and characterization of allelopathic volatiles from mugwort (Artemisia vulgaris)
Author(s):		Barney JN; Hay AG; Weston LA;
Address:		"Department of Horticulture, Cornell University, Ithaca, New York 14853, USA. jnb22@cornell.edu"
Journal Title:		J Chem Ecol
Year:		2005
Volume:		31
Issue:		2
Page Number:		247 - 265
DOI:		10.1007/s10886-005-1339-8
ISSN/ISBN:		0098-0331 (Print) 0098-0331 (Linking)
Abstract:		"Several volatile allelochemicals were identified and characterized from fresh leaf tissue of three distinct populations of the invasive perennial weed, mugwort (Artemisia vulgaris). A unique bioassay was used to demonstrate the release of volatile allelochemicals from leaf tissues. Leaf volatiles were trapped and analyzed via gas chromatography coupled with mass spectrometry. Some of the components identified were terpenes, including camphor, eucalyptol, alpha-pinene, and beta-pinene. Those commercially available were tested individually to determine their phytotoxicity. Concentrations of detectable volatiles differed in both absolute and relative proportions among the mugwort populations. The three mugwort populations consisted of a taller, highly branched population (ITH-1); a shorter, lesser-branched population (ITH-2) (both grown from rhizome fragments from managed landscapes); and a population grown from seed with lobed leaves (VT). Considerable interspecific variation existed in leaf morphology and leaf surface chemistry. Bioassays revealed that none of the individual monoterpenes could account for the observed phytotoxicity imparted by total leaf volatiles, suggesting a synergistic effect or activity of a component not tested. Despite inability to detect a single dominant phytotoxic compound, decreases in total terpene concentration with increase in leaf age correlated with decreases in phytotoxicity. The presence of bioactive terpenoids in leaf surface chemistry of younger mugwort tissue suggests a potential role for terpenoids in mugwort establishment and proliferation in introduced habitats"
Keywords:		Artemisia/*chemistry Bicyclic Monoterpenes Bridged Bicyclo Compounds/isolation & purification/toxicity Camphor/isolation & purification/toxicity Cyclohexanols/isolation & purification/toxicity Eucalyptol Gas Chromatography-Mass Spectrometry Monoterpenes/*;
Notes:		"MedlineBarney, Jacob N Hay, Anthony G Weston, Leslie A eng 2005/04/29 J Chem Ecol. 2005 Feb; 31(2):247-65. doi: 10.1007/s10886-005-1339-8"