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首页> 外文期刊>Environmental Science & Technology >Bidirectional Flux of Methyl Vinyl Ketone and Methacrolein in Trees with Different Isoprenoid Emission under Realistic Ambient Concentrations
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Bidirectional Flux of Methyl Vinyl Ketone and Methacrolein in Trees with Different Isoprenoid Emission under Realistic Ambient Concentrations

机译：实际环境浓度下不同类异戊二烯排放树中甲基乙烯基酮和甲基丙烯醛的双向通量

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摘要

Methyl vinyl ketone (MVK) and methacrolein (MAC) are key oxidation products (iox) of isoprene, the most abundant volatile organic compound (VOC) emitted by vascular plants in the atmosphere. Increasing attention has been dedicated to iox, as they are involved in the photochemical cycles ultimately leading to ozone (O_3) and particle formation. However, the capacity of plants to exchange iox under low and realistic ambient concentrations of iox needs to be assessed. We hypothesized that a foliar uptake of iox exists even under realistic concentrations of iox. We tested the capacity of iox exchange in trees constitutively emitting isoprene (Populus nigra) or monoterpenes (Quercus ilex), or that do not emit isoprenoids (Paulownia imperialis). Laboratory experiments were carried out at the leaf level using enclosures under controlled environmental factors and manipulating isoprene and reactive oxygen species (ROS) production by using the isoprene specific inhibitor fosmidomycin, acute O_3 exposure (300 ppbv for 4 h), and dark conditions. We also tested whether stress conditions inducing accumulation of ROS significantly enhance iox formation in the leaf, and their emission. Our results show a negligible level of constitutive iox emission in unstressed plants, and in plants treated with high O_3 The uptake of iox increased linearly with exposure to increasing concentrations of ambient iox (from 0 to 6 ppbv of a 1:1 = MVK/MAC mixture) in all the investigated species, indicating iox fast removal and low compensation point in unstressed and stressed conditions. Plant capacity to take up iox should be included in global models that integrate estimates of iox formation, emission, and photochemical reactions in the atmosphere.
机译：甲基乙烯基酮（MVK）和甲基丙烯醛（MAC）是异戊二烯的关键氧化产物（iox），异戊二烯是维管植物在大气中释放的最丰富的挥发性有机化合物（VOC）。由于iox参与了光化学循环，最终导致了臭氧（O_3）和颗粒形成，因此越来越关注iox。但是，需要评估植物在低且实际的环境内iox浓度下交换iox的能力。我们假设即使在实际浓度的iox下也存在叶吸收iox。我们测试了组成释放异戊二烯（Populus nigra）或单萜（Quercus ilex）或不释放类异戊二烯（Paulownia imperialis）的树木中iox交换的能力。实验室实验是在受控环境因素的条件下在叶面使用封闭层进行的，并通过使用异戊二烯特异性抑制剂fosmidomycin，急性O_3暴露（300 ppbv持续4 h）和黑暗条件来控制异戊二烯和活性氧（ROS）的产生。我们还测试了诱导ROS积累的胁迫条件是否显着增强了叶片中iox的形成及其排放。我们的结果表明，在无压力的植物中以及在用高O_3处理的植物中，组成性iox排放的水平可以忽略不计。随着环境iox浓度的增加（从1：1的MVK / MAC从0到6 ppbv暴露），iox的吸收呈线性增加混合物）在所有受调查的物种中，表明在无压力和有压力的条件下，iox快速去除且补偿点低。吸收iox的工厂能力应纳入整合了大气中iox形成，排放和光化学反应的估计值的全局模型中。

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  • 来源
    《Environmental Science & Technology》 |2015年第13期|7735-7742|共8页
  • 作者

    Silvano Fares; Elena Paoletti; Francesco Loreto; Federico Brilli;

  • 作者单位

    Council for Agricultural Research and Economics-Research Center for the Soil-Plant System, Rome 00184, Italy;

    National Research Council, Institute for Sustainable Plant Protection (IPSP), Firenze 1-50019, Italy;

    National Research Council, Department of Biology, Agriculture and Food Science (DISBA), Rome 7-00185, Italy;

    National Research Council, Institute of Agro-Environmental and Forest Biology (IBAF), Rome 7-00185, Italy;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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