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Interaction between ozone and winter stress.

J D Barnes1, K Reiling, A W Davison

  • 1Department of Biology, University of Newcastle, Newcastle upon Tyne, UK.

Environmental Pollution (Barking, Essex : 1987)
|January 1, 1988
PubMed
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Ozone pollution weakens plants, making them more susceptible to winter stresses like freezing. This study shows ozone injury increases freezing damage in peas, impacting crop loss assessments.

Area of Science:

  • Plant physiology
  • Environmental science
  • Agricultural science

Background:

  • Ozone (O3) is a pollutant that can affect plants, particularly during non-growing seasons in Europe.
  • Interactions between air pollutants like O3 and environmental stresses (chilling, freezing, winter desiccation) are not well understood.
  • Understanding these interactions is crucial for assessing crop loss, especially for overwintering plants.

Purpose of the Study:

  • To investigate the effects of ozone on the freezing resistance of pea plants (Pisum sativum L.).
  • To evaluate the use of induced chlorophyll fluorescence kinetics as a method for detecting latent ozone injury.
  • To compare the sensitivity of two pea cultivars, 'Feltham First' and 'Conquest', to ozone and subsequent freezing stress.

Main Methods:

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  • Pea plants were fumigated with ozone (0.075 ppm) for 7 days.
  • Diffusive resistance and induced chlorophyll fluorescence were measured daily.
  • Plants were hardened at controlled temperatures before exposure to freezing temperatures (-2 to -8 degrees C).
  • Electrolyte leakage was measured to quantify freezing injury.

Main Results:

  • Ozone exposure caused stomatal closure in both cultivars, with a faster response in 'Conquest'.
  • Ozone rapidly affected fluorescence kinetics, indicating latent injury.
  • Ozone exposure increased freezing injury and electrolyte leakage in pea plants.
  • 'Feltham First' showed greater sensitivity to freezing after ozone exposure compared to 'Conquest'.

Conclusions:

  • Ozone exposure significantly reduces the freezing resistance of pea plants.
  • Induced chlorophyll fluorescence kinetics can effectively detect latent ozone injury and differentiate cultivar sensitivity.
  • The interaction between ozone pollution and winter stress has significant implications for crop loss assessment, particularly for overwintering crops.