Journal
ENVIRONMENTAL POLLUTION
Volume 157, Issue 5, Pages 1478-1486Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2008.09.048
Keywords
VOC; Ozone flux; Isoprene; Monoterpene; Antioxidant
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Funding
- European Science Foundation
- European Commission in Marie-Curie Research Training Network ISONET [MCRTN-CT-2003-504720]
- Marie Curie International Fellowship within the 6th European Community Framework Programme [MOIF-CT-2005-007692]
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Volatile Organic Compounds (VOCs) emitted from vegetation (particularly isoprenoids) represent an important source of atmospheric hydrocarbons almost double the anthropogenic source. When biogenic VOC mix with NOx in the presence of UV radiation, ozone (O-3) is formed. In Italy, optimal conditions for O-3 formation in terms of VOC/NOx ratios and abundance of UV radiation occur for long periods of the year. Moreover, Italian vegetation includes several species that are strong and evergreen isoprenoid emitters, and high temperatures for part of the year further stimulate these temperature-dependent emissions. We review emission of isoprenoids from Italian vegetation, current knowledge on the impact of rising O-3 levels on isoprenoid emission, and evidence showing that isoprenoids can increase both the O-3 flux to the plant and protection against oxidative stress because of their antioxidant functions. This trait not only influences plant tolerance to O-3 but also may substantially alter the flux of O-3 between atmosphere and biosphere. (C) 2008 Elsevier Ltd. All rights reserved.
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