Component Analysis of Volatile Organic Compounds Released by Branch and Leaf of Quercus variabilis and Response to Mechanical Injury in Beijing Pinggu
ZHANG Yu-Ting, WANG Xiao-Fei, NI Yan-Yan, LIU Jian-Feng, JIANG Ze-Ping
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The experiment was conducted to study the component of VOCs released by branch and leaf of Quercus variabilis and response to mechanical injury in Beijing Pinggu. The plant volatile organic compounds(BVOCs) from branches and leaves of Q.variabilis were collected and analyzed with GC-MS. Eight kinds of volatile components, such as esters, alkanes, terpenes, aromatic hydrocarbons, aldehydes and ketones, alcohols, alkenes, as well as other N-containing, S-containing and Cl-containing compound were detected. Esters and alkanes were the main components of Q.variabilis, and account for 30.32%-41.60% and 30.02%-33.14% of the total plant volatile organic compounds content. The comparison of undamaged and mechanically-damaged leaves of Q.variabilis indicated that they had similar VOCs, while the components and contents of volatile substances changed. Dibutyl phthalate, 1-Hexanol, 2-ethyl-, Tetradecane, 2,6,10-trimethyl-, Cyclohexane, 2-ethenyl-1, 1-dimethyl-3-methylene-, Tetradecane, Nonadecane, 9-Octadecenamide,(Z)-, Nonanal, Decanal, etc. were the main components. Mechanical damage brings different degree effects on components and relative content of volatile organic compounds of Q.variabilis branches and leaves. Naphthalene, d-Limonene, 1,3,6-Octatriene, 3,7-dimethyl-,(Z)-,4-Hexen-1-ol, acetate, Dibutyl phthalate, Acetic acid, hexyl ester, Benzoic acid, butyl ester, Cyclohexane, 2-ethenyl-1,1-dimethyl-3-methylene-could be induced and their content increased obviously after mechanical damage. Esters and alkanes were the main VOCs components of Q.variabilis. The contents of naphthalene, d-Limonene, 4-Hexen-1-ol, acetate, Dibutyl phthalate were increased obviously after mechanical damage and these substances had certain ecological function and effect on the anti-herbivory. This may be a chemical defense strategy of Q.variabilis in response to herbivory or against external stress. In addition, many components also changed at different degree or small amplitude after mechanical damage. It's to be further studied on their change mechanism and ecological function.