tested in triplicate. Statistical methods. The effect of DT on essential oil content and the concentration and yield of alpha-pinene, beta-pinene, myrcene, delta-3-carene, limonene, cis-ocimene, linalyl anthranilate, alpha-terpinyl acetate, germacrene-D
accessions of Iranian A. millefolium are known to produce a wide variety of chemical compounds in the essential oils, with the most abundant components identified as chamazulene, germacrene D, sabinene, β-caryophyllene, p-cymene, bornyl acetate, camphene, β
, beta-bourbonene, beta-caryophyllene, and germacrene D. Of the 47 oil constituents identified ( Table 1 ), we selected the 14 with the highest concentration (beta-pinene, myrcene, limonene, eucalyptol, cis-sabinene hydrate, 4-terpineol, cis
). Statistical analysis. The effect of DT on essential oil content as well as the concentration and yield of alpha-pinene, camphene, paracymene, eucalyptol, camphor, borneol, beta-caryophyllene, transbeta-farnesene, beta-chamigrene, germacrene-D, gamma
, limonene, eucalyptol, cis-sabinene hydrate, 4-terpineol, neo-dihydro carveol/cis-dihyd, cis-carveol, carvone, beta-caryophyllene, trans-beta-farnesene, and germacrene D was determined through analysis of variance (ANOVA) of a completely randomized design
,5-dimethoxytoluene at 4273 μg·g −1 and dihydro-β-ionone at 247 μg·g −1 ( Fig. 3A ). The emission rates of 1,3,5-trimethoxybenzene and germacrene D were 331 and 1015 μg·g −1 in R. chinensis Jacq. var. spontanea , respectively ( Table 2 ). R. damascene and R
-limonene, 1.8 cineole, paracimene, transsabinenehydrate, l-menthone, menthofuran, d-isomenthone, b-bourbonene, menthyl acetate, neo-menthol, b-cariophyllene, l-menthol, pulegone, germacrene-d, and piperitone. The major constituent was L-menthol, which varied
). Substantially fewer terpenoids (i.e., two, eight, and eight) emanated from S. trifasciata , F. benjamina , and C. lutescens , which were not in flower and quantitatively emitted fewer volatiles than S. wallisii . Germacrene D and E -farnesene epoxide were
dominated by carvacrol production at ≈70% of the essential oil, whereas the Italian oregano line produced much lower concentrations. The Italian oregano plants were richer in other aromatic volatiles, such as thujene, germacrene, spathulenol, and
elucidated in Streptomyces coelicolor , is an Mg 2+ dependent cyclization reaction ( Jiang et al., 2006 ). Geosmin synthase, a unique bifunctional sesquiterpene synthase, first converts farnesyl diphosphate into an 85:15 mix of germacradianol and germacrene