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Planta

, Volume 183, Issue 2, pp 281–293 | Cite as

Calmodulin and wound healing in the coenocytic green alga Ernodesmis verticillata (Kützing) Børgesen

Immunofluorescence and effects of antagonists
  • R. H. Goddard
  • J. W. La ClaireII
Article

Abstract

The involvement of calmodulin (CaM) in wound-induced cytoplasmic contractions in E. verticillata was investigated. Indirect immunofluorescence of CaM in intact cells showed a faint, reticulate pattern of fluorescence in the cortical cytoplasm. Diffuse fluorescence was evident deeper within the cytoplasm. In contracted cells, CaM co-localizes with actin in the cortical cytoplasm in extensive, longitudinal bundles of microfilaments (MFs), and in an actin-containing reticulum. No association of CaM with tubulin was ever observed in the cortical cytoplasm at any stage of wound-healing. When contraction rates in wounded cells are measured, a lag period of 2 min is followed by a rapid, steady rate of movement over the subsequent 10 min. The delay in the initiation of longitudinal contraction corresponds to the time necessary for the assembly of the longitudinal MF bundles. Cytoplasmic motility was inhibited in a dose-dependent manner by CaM antagonists. In these inhibited cells, MF bundles did not assemble, or were poorly formed. In the latter case, CaM was always found associated with MFs. These results indicate a direct spatial and temporal correlation between CaM and actin, and a potential role for CaM in regulating the formation of functional MF bundles during wound-induced cytoplasmic contraction in Ernodesmis.

Key words

Actin Calmodulin Ernodesmis Microfilament Microtubule Tubulin Wound healing (alga) 

Abbreviations

CaM

calmodulin

DMSO

dimethyl sulfoxide

EGTA

ethylene glycol-bis(β-aminoethyl ether)-N,N,N′,N′-tetraacetic acid

MF(s)

microfilament(s)

MT(s)

microtubule(s)

TFP

trifluoperazine

w-5

N-(6-aminohexyl)-1-naphthalenesulfonamide

W-7

N-(6-aminohexyl)-5-chloro-1-naphthalenesulfonamide

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Copyright information

© Springer-Verlag 1991

Authors and Affiliations

  • R. H. Goddard
    • 1
  • J. W. La ClaireII
    • 1
  1. 1.Department of BotanyUniversity of TexasAustinUSA

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