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Volatiles Emitted at Different Flowering Stages of Jasminum sambac and Expression of Genes Related to α-Farnesene Biosynthesis

by Ying Yu 1, Shiheng Lyu 1,2, Dan Chen 1, Yi Lin 1, Jianjun Chen 1,2,*, Guixin Chen 1,* and Naixing Ye 1,*
1
College of Horticulture, Key Laboratory of Tea Science, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
2
Department of Environmental Horticulrture and Mid-Florida Research and Education Center, University of Florida, IFAS, Apopka, FL 32703, USA
*
Authors to whom correspondence should be addressed.
Academic Editor: Derek J. McPhee
Molecules 2017, 22(4), 546; https://doi.org/10.3390/molecules22040546
Received: 3 February 2017 / Revised: 22 March 2017 / Accepted: 27 March 2017 / Published: 29 March 2017
(This article belongs to the Section Natural Products Chemistry)
Fresh jasmine flowers have been used to make jasmine teas in China, but there has been no complete information about volatile organic compound emissions in relation to flower developmental stages and no science-based knowledge about which floral stage should be used for the infusion. This study monitored volatile organic compounds emitted from living flowers of Jasminum sambac (L.) Ait. ‘Bifoliatum’ at five developmental stages and also from excised flowers. Among the compounds identified, α-farnesene, linalool, and benzyl acetate were most abundant. Since α-farnesene is synthesized through the Mevalonate pathway, four genes encoding 3-hydroxy-3-methylglutaryl coenzyme A synthase, 3-hydroxy-3-methylglutaryl coenzyme A reductase (HMGR), farnesyl pyrophosphate synthase, and terpene synthase were isolated. Their expression patterns in living flowers at the five stages and in excised flowers coincided with the emission patterns of α-farnesene. Application of lovastatin, a HMGR inhibitor, significantly reduced the expression of the genes and greatly decreased the emission of α-farnesene. The sweet scent was diminished from lovastatin-treated flowers as well. These results indicate that α-farnesene is an important compound emitted from jasmine flowers, and its emission patterns suggest that flowers at the opening stage or flower buds 8 h after excision should be used for the infusion of tea leaves. View Full-Text
Keywords: jasmine; Jasminum sambac (L.) Aiton; α-farnesene; 3-hydroxy-3-methylglutaryl coenzyme A synthase (HMGS); 3-hydroxy-3-methylglutaryl coenzyme A reductase (HMGR); farnesyl pyrophosphate synthase (FPPS); lovastatin; terpene synthase (TPS) jasmine; Jasminum sambac (L.) Aiton; α-farnesene; 3-hydroxy-3-methylglutaryl coenzyme A synthase (HMGS); 3-hydroxy-3-methylglutaryl coenzyme A reductase (HMGR); farnesyl pyrophosphate synthase (FPPS); lovastatin; terpene synthase (TPS)
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Yu, Y.; Lyu, S.; Chen, D.; Lin, Y.; Chen, J.; Chen, G.; Ye, N. Volatiles Emitted at Different Flowering Stages of Jasminum sambac and Expression of Genes Related to α-Farnesene Biosynthesis. Molecules 2017, 22, 546.

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