Journal Article

Significance of Ca<sup>2+</sup> and K<sup>+</sup> in <i>Micrasterias</i> Growth and Morphogenesis

Juhani Lehtonen and Katja Volanto-Lumppio

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 37, issue 8, pages 1126-1133
Published in print December 1996 | ISSN: 0032-0781
e-ISSN: 1471-9053 | DOI:
Significance of Ca2+ and K+ in Micrasterias Growth and Morphogenesis

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  • Biochemistry
  • Molecular and Cell Biology
  • Plant Sciences and Forestry


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Significance of Ca2+ and K+ for the complex morphogenesis of Micrasterias, which takes place through multipolar tip growth, was investigated. Studies with different external Ca2+ concentrations and Ca2+ channel inhibitors LaCl3 and verapamil indicate that Ca2+ and Ca2+ channels are essential in the development, while treatments with different K+ concentrations and K+ channel inhibitor TEA demonstrate that potassium or K+ channels are not needed in the process, albeit the existence of K+ channels. K+ is not needed even for the regulation of turgor pressure, which was found to decrease clearly during cell development. The plasma membrane ATPase inhibitors diethylstilbesterol (DES) and Na-orthovanadate stop morphogenesis and indicate the importance of ion pumps in the developmental process. Both supraoptimal, external K+ and Ca2+ cause abundant Ca2+ precipitate formation in chloroplasts, which shows that chloroplasts are important in regulation of cytoplasmic Ca2+ metabolism and that K+ activates the uptake of Ca2+ through Ca2+ channels.

Keywords: ATPase inhibitors; Ca2+; Ca2+ channel inhibitors; K+; Micrasterias; Morphogenesis; TEA

Journal Article.  0 words. 

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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