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Does elevated ozone have differing effects in flowering and deblossomed strawberry?

P D Drogoudi1, M R Ashmore1

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Summary

Ozone exposure negatively impacts strawberry plants, reducing leaf growth and photosynthesis, especially in fruiting plants. While initial flowering may increase, overall fruit yield is not significantly affected during the fumigation period.

Keywords:
Fragaria×ananassa (strawberry)growthozonephotosynthesisreproductive development

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Area of Science:

  • Plant Science
  • Environmental Science
  • Agricultural Science

Background:

  • Ozone is a significant air pollutant impacting plant physiology.
  • Strawberry (Fragaria×ananassa) is a commercially important crop susceptible to environmental stressors.

Purpose of the Study:

  • To investigate the effects of ozone on strawberry plant development and physiology.
  • To compare responses between fruiting and deblossomed plants under ozone stress.

Main Methods:

  • Strawberry plants were exposed to 92 ppb ozone or filtered air in open-top chambers for 69 days.
  • Evaluated flower and fruit production, leaf area growth rate, gas exchange, and biomass.
  • Distinguished between fruiting and deblossomed plant groups.

Main Results:

  • Ozone initially accelerated inflorescence production but later reduced it, along with fruit set and individual fruit weight.
  • Leaf senescence was accelerated, and photosynthesis rates decreased, particularly in older leaves.
  • Relative leaf area growth rate and above-ground biomass were significantly reduced in fruiting plants but not in deblossomed plants.

Conclusions:

  • Ozone exposure negatively affects key physiological and developmental processes in strawberry plants.
  • Fruiting plants exhibit greater sensitivity to ozone-induced reductions in growth and biomass.
  • While short-term yield may not be impacted, ozone poses a significant threat to strawberry crop health and productivity.