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Responses to ozone pollution of alfalfa exposed to increasing salinity levels

Authors
Journal
Environmental Pollution
0269-7491
Publisher
Elsevier
Publication Date
Volume
157
Issue
5
Identifiers
DOI: 10.1016/j.envpol.2008.09.013
Keywords
  • Medicago Satival.
  • Alfalfa
  • Soil Salinity
  • Yield Losses
  • Ozone Uptake
Disciplines
  • Biology

Abstract

Abstract Stomatal closure and biosynthesis of antioxidant molecules are two fundamental components of the physiological machinery that lead to stress adaptation during plant's exposure to salinity. Since high stomatal resistance may also contribute in counteracting O 3 damages, we hypothesized that soil salinization may increase O 3 tolerance of crops. An experiment was performed with alfalfa grown in filtered (AOT40 = 0 in both years) and non-filtered (AOT40 = 9.7 in 2005 and 6.9 ppm h in 2006) open-top chambers. Alfalfa yield was reduced by O 3 (−33%) only in plants irrigated with salt-free water, while the increasing levels of soil salinity until 1.06 dS m −1 reduced both stomatal conductance and plant O 3 uptake, thus linearly reducing O 3 effects on yield. Therefore a reliable flux-based model for assessing the effects of O 3 on crop yield should take into account soil salinity.

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