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Calcium signalling in stomatal responses to pollutants.

Martin R McAinsh1, Nicky H Evans1, Lucy T Montgomery1

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Summary

Air pollutants like sulfur dioxide and ozone significantly impact plant stomata, affecting water regulation and stress responses. Understanding these complex interactions is crucial for plant physiology and environmental science.

Keywords:
calcium homeostasiscytosolic free calciumguard cellnitrogen dioxideozonepollutantsignallingstomatasulphur dioxide

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Area of Science:

  • Plant Physiology
  • Environmental Science
  • Biochemistry

Background:

  • Stomatal responses to air pollutants are species-specific and influenced by concentration, environment, and plant age.
  • Short-term sulfur dioxide (SO2) exposure typically opens stomata, while long-term exposure can cause closure. Oxides of nitrogen (NOx) effects are often minimal.
  • Ozone and oxidative stress present complex effects, including rapid stomatal closure short-term and sluggish responses long-term.

Purpose of the Study:

  • To investigate the multifaceted effects of air pollutants on stomatal responses.
  • To explore the impact of air pollutants, particularly ozone and oxidative stress, on guard cell calcium (Ca2+) signaling.
  • To understand how pollutants affect plant water regulation and signal transduction pathways.

Main Methods:

  • Review of existing literature on stomatal responses to various air pollutants.
  • Analysis of studies focusing on the effects of ozone and oxidative stress on guard cell physiology.
  • Examination of research on calcium (Ca2+) homeostasis and signaling in guard cells under pollutant exposure.

Main Results:

  • Air pollutants like SO2, NOx, and ozone induce varied stomatal responses, from opening to closure and altered sensitivity.
  • Ozone exposure can impair stomatal closure during drought and slow abscisic acid (ABA) signal transduction.
  • Evidence suggests air pollutants disrupt Ca2+ homeostasis and signaling in guard cells, impacting stomatal movement.

Conclusions:

  • Air pollutants significantly alter stomatal behavior and plant responses to environmental stress.
  • Guard cell Ca2+ signaling pathways are a key target for the adverse effects of ozone and oxidative stress.
  • Further research is needed to fully elucidate the mechanisms by which air pollutants affect plant gas exchange and water relations.