Journal
ENVIRONMENTAL POLLUTION
Volume 166, Issue -, Pages 152-156Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2012.03.013
Keywords
Tropospheric ozone; Stomatal conductance; Stomatal sluggishness; Photosynthesis; Leaf senescence
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Funding
- Ministry of the Environment, Japan [B-1105]
- Japanese Society for Promotion of Science [Type B 23380078]
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We investigated the effects of ozone and leaf senescence on steady-state stomatal conductance and stomatal response to light variation. Measurements were carried out in a free-air ozone exposure experiment on a representative deciduous broadleaved tree species in Japan (Fagus crenata). Both steady-state and dynamic stomatal response to light variation varied intrinsically with season due to leaf senescence. Ozone induced the decrease in steady-state leaf gas exchange and the sluggish stomatal closure progressively. These findings suggest that ozone reduces the ability of plants to adapt to a fluctuating light environment under natural conditions, and therefore impairs plant growth and ability to control water loss. (C) 2012 Elsevier Ltd. All rights reserved.
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