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Updated: Apr 28, 2026

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Drought-induced guard cell signal transduction involves sphingosine-1-phosphate.

C K Ng1, K Carr, M R McAinsh

  • 1Department of Biological Sciences, Institute of Environmental and Natural Sciences, Lancaster University, Bailrigg, Lancaster LA1 4YQ, UK.

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|March 30, 2001
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Summary

Sphingosine-1-phosphate mobilizes calcium in plants, acting as a key signaling molecule. This discovery reveals its role in drought responses and abscisic acid pathways, impacting stomatal regulation.

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Area of Science:

  • Plant Biology
  • Molecular Signaling
  • Biochemistry

Background:

  • Stomata regulate CO2 uptake and water loss, crucial for plant survival.
  • Calcium ions (Ca2+) act as intracellular messengers in stomatal responses.
  • Specificity in calcium signaling is vital for distinct plant responses to stimuli.

Purpose of the Study:

  • To identify novel calcium-mobilizing molecules in plants.
  • To investigate the role of sphingosine-1-phosphate in plant signaling pathways.
  • To understand the link between sphingosine-1-phosphate, abscisic acid, and stomatal closure.

Main Methods:

  • Investigated calcium dynamics in response to various stimuli.
  • Quantified sphingosine-1-phosphate levels under drought conditions.
  • Assessed the involvement of sphingosine-1-phosphate in abscisic acid-induced stomatal closure.

Main Results:

  • Sphingosine-1-phosphate was identified as a novel calcium-mobilizing molecule in plants.
  • Drought stress led to increased levels of sphingosine-1-phosphate.
  • Evidence suggests sphingosine-1-phosphate mediates abscisic acid signaling to guard cells.

Conclusions:

  • Sphingosine-1-phosphate plays a significant role in plant calcium signaling.
  • This molecule is implicated in the drought stress response pathway.
  • Understanding sphingosine-1-phosphate signaling can lead to improved crop water-use efficiency.