Université Clermont Auvergne, Clermont Auvergne INP, CNRS, Institut de Chimie de Clermont-Ferrand, 63000, Clermont-Ferrand, France.
Department of Chemistry, Gustavus Adolphus College, Saint Peter, MN, USA.
Photochem Photobiol Sci. 2022 Aug;21(8):1497-1510. doi: 10.1007/s43630-022-00228-w. Epub 2022 May 9.
Plants play a central role in the photochemistry of chemicals in the environment. They represent a major atmospheric source of volatile organic compounds (VOCs) but also an important environmental surface for the deposition and photochemical reactions of pesticides, gaseous and particulate pollutants. In this review, we point out the role of plant leaves in these processes, as a support affecting the reactions physically and chemically and as a partner through the release of natural constituents (water, secondary metabolites). We discuss the influence of the chosen support (leaves, needle surfaces or fruit cuticles, extracted cuticular waxes and model surfaces) and other factors (additives, pesticides mixture, and secondary metabolites) on the photochemical degradation kinetics and mechanisms. We also show how plants can be a source of photochemically reactive species which can act as photosensitizers promoting the photodegradation of pesticides or the formation and aging of secondary organic aerosols (SOA) and secondary organic materials (SOM). Understanding the fate of chemicals on plants is a research area located at the interface between photochemistry, analytical chemistry, atmospheric chemistry, microbiology and vegetal physiology. Pluridisciplinary approaches are needed to deeply understand these complex phenomena in a comprehensive way. To overcome this challenge, we summarize future research directions which have been clearly overlooked until now.
植物在环境化学物质的光化学中起着核心作用。它们是挥发性有机化合物（VOCs）的重要大气源，但也是农药、气态和颗粒污染物沉积和光化学反应的重要环境表面。在这篇综述中，我们指出了植物叶片在这些过程中的作用，它们既是影响反应的物理和化学支撑物，也是通过释放天然成分（水、次生代谢物）的伙伴。我们讨论了所选支撑物（叶片、针表面或果实角质层、提取的角质层蜡和模型表面）和其他因素（添加剂、农药混合物和次生代谢物）对光化学反应动力学和机制的影响。我们还展示了植物如何成为光化学反应性物质的来源，这些物质可以作为光敏剂，促进农药的光降解或二次有机气溶胶（SOA）和二次有机物质（SOM）的形成和老化。了解化学物质在植物上的命运是光化学、分析化学、大气化学、微生物学和植物生理学之间的一个研究领域。需要多学科的方法来全面深入地理解这些复杂现象。为了克服这一挑战，我们总结了迄今为止明显被忽视的未来研究方向。
