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Giuliana Mulas and Lyle E. Craker

Variation in light quality is known to modify plant morphology, growth, and chemical constituency in plants. In the present study, the effect of light quality on growth and essential oil composition in rosemary (Rosmarinus officinalis L.) was investigated by comparing plants receiving supplemental red (660 nm) and far-red (730 nm) with each other and with control plants not receiving supplemental light. Except for the supplemental light treatments, all plants were grown under natural light conditions in a greenhouse and received full daylight, averaging 9.23 h/day during the study. The red and far-red light treatments, given as day extensions, started daily 15 min before sunset and continued for 4 h each evening for 4 weeks. No significant differences were observed in biomass yield from the different light treatments, but far-red light caused elongation of internodes and a reduction in the number of leaves in comparison with control and red-light treated plants. Essential oil production was highest in plants grown under far-red light treatments.

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Shahrokh Khanizadeh and Andre Belanger

Considerable variability in susceptibility to two-spotted spider mite (TSSM) were observed for the strawberry cultivars used as parents and some of our promising selections. Large variation was observed for 9-octadecenal oil composition followed by linalool, C9H1002, decanal, β-cyclocitral, α-terpineol and (Z)-3-hexenol. The purpose of this research was to identify the relative susceptibility of selected strawberry lines to TSSM in relation to leaf essential oil composition. One objective of our breeding program is the early identification of susceptible lines and/or seedlings so that they can be eliminated prior to field trials.

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Bahlebi K. Eiasu, Puffy Soundy and J. Martin Steyn

Soil water supply is one of the major abiotic factors that determine the biosynthetic processes in plants ( Letchamo et al., 1995 ). Response of essential oil yield and composition to water stress varies with duration and severity of stress

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Valtcho D. Zheljazkov, Charles L. Cantrell, William B. Evans, M. Wayne Ebelhar and Christine Coker

essential oil production is at flowering, when the oil content and preferred composition are the highest ( Topalov, 1962 ; Zheljazkov, 1998 ). Various basil species and cultivars provide essential oil with different compositions and aroma. The

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Valtcho D. Zheljazkov, Vasile Cerven, Charles L. Cantrell, Wayne M. Ebelhar and Thomas Horgan

harvested area of ≈32,076 ha ( USDA, NASS, Crop Report, 2007 ). The U.S. peppermint oil is considered of high quality and U.S. essential oil broker companies have dominated the peppermint essential oil market. The essential oil content and composition of

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Santosh Shiwakoti, Henry Y. Sintim, Shital Poudyal, Jennifer Bufalo, Charles L. Cantrell, Tess Astatkie, Ekaterina Jeliazkova, Lyn Ciampa and Valtcho D. Zheljazkov

of Japanese cornmint grown in a more northern climate. Diurnal variations in essential oil content and composition of aromatic plants from the same family have been reported previously for clary sage ( Salvia sclarea L.) ( Shevchenko, 1973

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Valtcho D. Zheljazkov, Santosh Shiwakoti, Tess Astatkie, Ivan Salamon, Daniela Grul'ová, Silvia Mudrencekova and Vicki Schlegel

characteristics of Cuminum cyminum and Rosmarinus officinalis essential oils Food Chem. 102 898 904 Ghafari, Z. Alizadeh, A. Samani, R.B. 2014 Antimicrobial activity and essential oil composition of Cuminum cyminum L. and Carum carvi L. seeds from Iran

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Andrea L. Medina-Holguín, Sandra Micheletto, F. Omar Holguín, Jaime Rodriguez, Mary A. O'Connell and Charles Martin

Mexico. Variables such as temperature, annual rainfall, and cultivation have been examined for their effects on the abundance of three essential oil components: piperitone, thymol, and methyeugenol ( Fig. 1 ). Stability of chemical composition in wild

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Valtcho D. Zheljazkov, Charles L. Cantrell, M. Wayne Ebelhar, Dennis E. Rowe and Christine Coker

essential oil yields or oil with a desirable composition (an elevated concentration of a compound of interest). The chemical composition of basil is of a great interest to various industries that are using basil essential oil. Hence, in systems in which

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Valtcho D. Zheljazkov, Tess Astatkie and Ekaterina Jeliazkova

, neither of these studies provided insight on how drying duration and drying condition (shade and sun) affect the essential oil yield and composition of ‘Native’ spearmint. Therefore, the objective of this study was to determine the effects of drying