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Related Experiment Videos

Ca2+signalling in stomatal guard cells.

M R McAinsh1, J E Gray, A M Hetherington

  • 1Institute of Environmental and Natural Sciences, Department of Biological Sciences, Lancaster University, Lancaster LA1 4YQ, U.K. m.mcainsh@lancaster.ac.uk

Biochemical Society Transactions
|August 30, 2000
PubMed
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Calcium (Ca2+) acts as a vital second messenger in plant stomatal guard cells, mediating responses to environmental cues. Unique Ca2+ signaling patterns explain its role in both stomatal opening and closure.

Area of Science:

  • Plant physiology
  • Cell signaling

Background:

  • Calcium ions (Ca2+) are crucial second messengers in plant signal transduction.
  • Stomatal guard cells utilize Ca2+ signaling to regulate stomatal aperture in response to environmental stimuli.

Purpose of the Study:

  • To investigate the role of Ca2+ in stomatal guard cell signaling.
  • To understand how Ca2+ mediates both stomatal opening and closure.

Main Methods:

  • Analysis of guard cell cytosolic free Ca2+ concentration ([Ca2+]cyt) changes.
  • Identification of Ca2+-mobilizing pathways (e.g., cADP-ribose, phospholipase C/Ins(1,4,5)P3).
  • Experimental modulation of [Ca2+]cyt to observe effects on guard cell turgor and ion channel activity.

Main Results:

Related Experiment Videos

  • Stimulus-induced increases in [Ca2+]cyt are central to guard cell signal transduction.
  • Ca2+ signaling pathways, including cADP-ribose and phospholipase C, are present in guard cells.
  • Modulating [Ca2+]cyt affects guard cell turgor and ion channel activity.

Conclusions:

  • Ca2+ plays a pivotal role in mediating guard cell responses to external stimuli.
  • The dual role of Ca2+ in stomatal opening and closure may be explained by stimulus-specific Ca2+ signatures (unique spatial and temporal characteristics).