Ozone induced emissions of biogenic VOC from tobacco:: relationships between ozone uptake and emission of LOX products
Ozone induced emissions of biogenic VOC from tobacco:: relationships between ozone uptake and emission of LOX products
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DOI：
10.1111/j.1365-3040.2005.01383.x
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发表时间：
2005-10-01
影响因子：
7.3
通讯作者：
Wildt, J
中科院分区：
文献类型：
--
作者：
Beauchamp, J;Wisthaler, A;Wildt, J
烟草挥发性有机化合物（VOC）的排放。变种为了研究植物对臭氧胁迫的响应，采用质子转移反应质谱（PTR-MS）和气相色谱-质谱（GC-MS）技术，对臭氧（O-3）胁迫下的植物进行了研究。O-3暴露于照射植物引起暴露后VOC排放爆发。十八烷途径内产生的挥发性C-6排放量的发病滞后时间被发现成反比的O-3吸收，或更准确地说，到植物的O-3通量密度。在相同持续时间的短O-3脉冲的情况下，这些排放的C-6挥发性有机化合物的总量与进入植物的O-3通量密度有关，而不是臭氧浓度或剂量-反应关系，如AOT 40值。植物每吸收5个O-3分子，大约排放1个C-6产物。发现O-3诱导C-6产物排放的阈值通量密度为（1.6 +/- 0.7）× 10（-8）mol m（-2）s（-1）。
Volatile organic compound (VOC) emissions from tobacco (Nicotiana tabacum L. var. Bel W3) plants exposed to ozone (O-3) were investigated using proton-transfer-reaction mass-spectrometry (PTR-MS) and gas chromatography mass-spectrometry (GC-MS) to find a quantitative reference for plants' responses to O-3 stress. O-3 exposures to illuminated plants induced post-exposure VOC emission bursts. The lag time for the onset of volatile C-6 emissions produced within the octadecanoid pathway was found to be inversely proportional to O-3 uptake, or more precisely, to the O-3 flux density into the plants. In cases of short O-3 pulses of identical duration the total amount of these emitted C-6 VOC was related to the O-3 flux density into the plants, and not to ozone concentrations or dose-response relationships such as AOT 40 values. Approximately one C-6 product was emitted per five O-3 molecules taken up by the plant. A threshold flux density of O-3 inducing emissions of C-6 products was found to be (1.6 +/- 0.7) x 10(-8) mol m(-2) s(-1).