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Related Experiment Videos

Calcium channels in higher plants.

P J White1

  • 1Department of Cell Physiology, Horticulture Research International, Wellesbourne, Warwick, UK. philip-j.white@hri.ac.uk

Biochimica Et Biophysica Acta
|April 5, 2000
PubMed
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Plant calcium channels regulate signal transduction and physiological responses. This review details their properties and roles, focusing on plasma membrane and tonoplast channels, and their co-ordination in processes like stomatal closure.

Area of Science:

  • Plant Cell Physiology
  • Molecular Biology
  • Biophysics

Background:

  • Calcium ions (Ca2+) act as crucial second messengers in plant cells.
  • Cytoplasmic Ca2+ fluctuations mediate responses to various environmental stimuli.
  • Calcium channels are integral membrane proteins controlling Ca2+ flux.

Purpose of the Study:

  • To review the electrophysiological properties of plant calcium channels.
  • To discuss the physiological roles of calcium channels in plants.
  • To highlight the coordinated activity of calcium channels in specific plant responses.

Main Methods:

  • Electrophysiological recordings of calcium channel activity.
  • Analysis of spatial and temporal Ca2+ variations.
  • Review of existing literature on plant calcium channels.

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Main Results:

  • Calcium channels are found in multiple plant cell membranes, including plasma membrane, tonoplast, ER, chloroplast, and nuclear membranes.
  • Specific channel types, such as voltage-dependent and elicitor-activated plasma membrane channels, and depolarisation-activated (SV), hyperpolarisation-activated, IP3- and cADPR-dependent tonoplast channels, are detailed.
  • The role of calcium channel activity in abscisic acid (ABA)-induced stomatal guard cell closure is examined.

Conclusions:

  • Plant calcium channels are essential for signal transduction pathways.
  • Understanding calcium channel function is key to deciphering plant responses to biotic and abiotic stresses.
  • Coordinated calcium channel activity underlies complex physiological processes in plants.