title: Extracellular lipids of Camelina sativa: characterization of chloroform-extractable waxes from aerial and subterranean surfaces.
abstract: Camelina sativa (L.) Crantz is an emerging low input, stress tolerant crop with seed oil composition suitable for biofuel and bioproduct production. The chemical compositions and ultrastructural features of surface waxes from C. sativa aerial cuticles, seeds, and roots were analyzed using gas chromatography and microscopy. Alkanes, primary fatty alcohols, and free fatty acids were common components of all analyzed organs. A particular feature of leaf waxes was the presence of alkyl esters of long-chain fatty acids and very long-chain fatty alcohols, ranging from C38 to C50 and dominated by C42, C44 and C46 homologues. Stem waxes were mainly composed of non-sterol pentacyclic triterpenes. Flowers accumulated significant amounts of methyl-branched iso-alkanes (C29 and C31 total carbon number) in addition to straight-chain alkanes. Seed waxes were mostly primary fatty alcohols of up to 32 carbons in length and unbranched C29 and C31 alkanes. The total amount of identified wax components extracted by rapid chloroform dipping of roots was 280μgg(-1) (fresh weight), and included alkyl hydroxycinnamates, predominantly alkyl coumarates and alkyl caffeates. This study provides qualitative and quantitative information on the waxes of C. sativa root, shoot, and seed boundary tissues, allowing the relative activities of wax biosynthetic pathways in each respective plant organ to be assessed. This detailed description of the protective surface waxes of C. sativa may provide insights into its drought-tolerant and pathogen-resistant properties, and also identifies C. sativa as a potential source of renewable high-value natural products.
authors: Department of Biology and Institute of Biochemistry, Carleton University, Ottawa, Ontario, Canada.
authors: Fakhria M
authors: FM
authors: Razeq
authors: Department of Plant Biology, Michigan State University, East Lansing, MI, USA.
authors: Dylan K
authors: DK
authors: Kosma
authors: Department of Biology and Institute of Biochemistry, Carleton University, Ottawa, Ontario, Canada. Electronic address: owen.rowland@carleton.ca.
authors: Owen
authors: O
authors: Rowland
authors: Department of Biology, Algoma University, Sault Ste. Marie, Ontario, Canada. Electronic address: isabel.molina@algomau.ca.
authors: Isabel
authors: I
authors: Molina
mesh_terms: D019607:Brassicaceae / Q000737:chemistry*; D002109:Caffeic Acids / Q000737:chemistry; D003373:Coumaric Acids / Q000737:chemistry; D035264:Flowers / Q000737:chemistry; D008055:Lipids / Q000737:chemistry*; D009828:Oleanolic Acid / Q000031:analogs & derivatives / Q000737:chemistry; D053978:Pentacyclic Triterpenes / Q000737:chemistry; D018515:Plant Leaves / Q000737:chemistry; D018517:Plant Roots / Q000737:chemistry; D018547:Plant Stems / Q000737:chemistry; D012639:Seeds / Q000737:chemistry; D014885:Waxes / Q000737:chemistry*; D000094042:Lupanes
chemical_list: D002109:Caffeic Acids; D003373:Coumaric Acids; D008055:Lipids; D009828:Oleanolic Acid; D053978:Pentacyclic Triterpenes; D014885:Waxes; C036380:beta-amyrin; C010480:lupeol; D000094042:Lupanes
keywords: Alkyl hydroxycinnamates; Brassicaceae; Camelina sativa; Cuticle; Gas chromatography; Mass spectrometry; Root; Scanning electron microscopy; Seed; Triterpenoids; Waxes