| Title: | Regulation of Floral Terpenoid Emission and Biosynthesis in Sweet Basil (Ocimum basilicum) |
| Author(s): | Jiang Y; Ye J; Li S; Niinemets U; |
| Address: | "Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 1, Tartu 51014, Estonia. College of Art, Changzhou University, Gehu 1, Changzhou, 213164, Jiangsu, China. Estonian Academy of Sciences, Kohtu 6, Tallinn 10130, Estonia" |
| DOI: | 10.1007/s00344-016-9591-4 |
| ISSN/ISBN: | 0721-7595 (Print) 1435-8107 (Electronic) 0721-7595 (Linking) |
| Abstract: | "Past studies have focused on the composition of essential oil of Ocimum basilicum leaves, but data on composition and regulation of its aerial emissions, especially floral volatile emissions are scarce. We studied the chemical profile, within-flower spatial distribution (sepals, petals, pistils with stamina and pedicels), diurnal emission kinetics and effects of exogenous methyl jasmonate (MeJA) application on the emission of floral volatiles by dynamic headspace collection and identification using gas chromatography-mass spectrometry (GC-MS) and proton transfer reaction mass spectrometry (PTR-MS). We observed more abundant floral emissions from flowers compared with leaves. Sepals were the main emitters of floral volatiles among the flower parts studied. The emissions of lipoxygenase compounds (LOX) and monoterpenoids, but not sesquiterpene emissions, displayed a diurnal variation driven by light. Response to exogenous MeJA treatment of flowers consisted of a rapid stress response and a longer-term acclimation response. The initial response was associated with enhanced emissions of fatty acid derivatives, monoterpenoids, and sesquiterpenoids without variation of the composition of individual compounds. The longer-term response was associated with enhanced monoterpenoid and sesquiterpenoid emissions with profound changes in the emission spectrum. According to correlated patterns of terpenoid emission changes upon stress, highlighted by a hierarchical cluster analysis, candidate terpenoid synthases responsible for observed diversity and complexity of released terpenoid blends were postulated. We conclude that flower volatile emissions differ quantitatively and qualitatively from leaf emissions, and overall contribute importantly to O. basilicum flavor, especially under stress conditions" |
| Keywords: | Biosynthesis Emission dynamics Floral volatiles Methyl jasmonate treatments Terpenoids; |
| Notes: | "PubMed-not-MEDLINEJiang, Yifan Ye, Jiayan Li, Shuai Niinemets, Ulo eng 322603/ERC_/European Research Council/International 2018/01/26 J Plant Growth Regul. 2016 Dec; 35(4):921-935. doi: 10.1007/s00344-016-9591-4. Epub 2016 Mar 19" |
