Journal
ENVIRONMENTAL POLLUTION
Volume 207, Issue -, Pages 413-419Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2015.09.040
Keywords
Apoplast; Ascorbate; Detoxification; Ozone; Triticum aestivum L
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Funding
- Hundred Talents Program, Chinese Academy of Sciences
- Japan Society for the Promotion of Science [P09120]
- International S & T Cooperation Program of China [2009DFA31110]
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Besides stomatal closure, biological detoxification is an important protection mechanism for plants against ozone (O-3). This study investigated the diurnal changes of ascorbate (a major detoxification agent) in the apoplast and leaf tissues of winter wheat grown under ambient air field conditions. Results showed the reduced ascorbate in the apoplast (ASC(apo)) exhibited a peak in late morning or midday, mismatching with either the maximum external O-3 concentrations in mid-afternoon or the maximum stomatal O-3 uptake between late morning and mid-afternoon. In contrast, the ASC in leaf tissues remained stable throughout the day. The investigations conducted in a Free-Air Concentration Elevation of O-3 system confirmed that the diurnal variations of the ASC(apo) were induced more by the daily variations of O-3 concentrations rather than the cumulative O-3 effects. In conclusion, the O-3-stress detoxification should be a dynamic variable rather than a fixed threshold as assumed in the stomatal flux-based O-3 dose metrics. (C) 2015 Elsevier Ltd. All rights reserved.
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