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The Korean Society of Phycology (한국조류학회(藻類))
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Cytoskeletal changes during nuclear and cell division in the freshwater alga Zygnema cruciatum (Chlorophyta, Zygnematales)

  • Yoon, Min-Chul (Korea Atomic Energy Research Institute, Advanced Radiation Technology Institute) ;
  • Han, Jong-Won (Department of Biology, Kongju National University) ;
  • Hwang, Mi-Sook (National Fisheries Research and Development Institute (NFRDI)) ;
  • Kim, Gwang-Hoon (Department of Biology, Kongju National University)
  • Received : 2010.10.11
  • Accepted : 2010.11.07
  • Published : 2010.12.01
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Abstract

Cytoskeletal changes were observed during cell division of the green alga Zygnema cruciatum using flourescein isothiocynate (FITC)-conjugated phallacidin for F-actin staining and FITC-anti-$\alpha$-tubulin for microtubule staining. Z. cruciatum was uninucleate with two star-shaped chloroplasts. Nuclear division and cell plate formation occurred prior to chloroplast division. Actin filaments appeared on the chromosome and nuclear surface during prophase, and the F-actin ring appeared as the cleavage furrow developed. FITC-phallacidin revealed that actin filaments were attached to the chromosomes during metaphase. The F-actin ring disappeared at late metaphase. At telophase, FITC-phallacidin staining of actin filaments disappeared. FITC-anti-$\alpha$-tubulin staining revealed that microtubules were arranged beneath the protoplasm during interphase and then localized on the nuclear region at prophase, and that the mitotic spindle was formed during metaphase. The microtubules appeared between dividing chloroplasts. The results indicate that a coordination of actin filaments and microtubules might be necessary for nuclear division and chromosome movement in Z. cruciatum.

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References

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