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Proc Natl Acad Sci U S A. 2000 Feb 15;97(4):1932-7.

Elemental propagation of calcium signals in response-specific patterns determined by environmental stimulus strength.

Author information

  • 1Marine Biological Association of the United Kingdom, The Laboratory, Citadel Hill, Plymouth PL1 2PB, United Kingdom.

Abstract

Plant cells can respond qualitatively and quantitatively to a wide range of environmental signals. Ca(2+) is used as an intracellular signal for volume regulation in response to external osmotic changes. We show here that the spatiotemporal patterns of hypo-osmotically induced Ca(2+) signals vary dramatically with stimulus strength in embryonic cells of the marine alga Fucus. Biphasic or multiphasic Ca(2+) signals reflect Ca(2+) elevations in distinct cellular domains. These propagate via elemental Ca(2+) release in nuclear or peripheral regions that are rich in endoplasmic reticulum. Cell volume regulation specifically requires Ca(2+) elevation in apical peripheral regions, whereas an altered cell division rate occurs only in response to stimuli that cause Ca(2+) elevation in nuclear regions.

PMID:
10677557
[PubMed - indexed for MEDLINE]
PMCID:
PMC26539
Free PMC Article

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