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Titolo:
F-actin organization during the cell cycle of Sphacelaria rigidula (Phaeophyceae)
Autore:
Karyophyllis, D; Katsaros, C; Dimitriadis, I; Galatis, B;
Indirizzi:
Univ Athens, Fac Biol, Dept Bot, Athens 15784, Greece Univ Athens AthensGreece 15784 Fac Biol, Dept Bot, Athens 15784, Greece
Titolo Testata:
EUROPEAN JOURNAL OF PHYCOLOGY
fascicolo: 1, volume: 35, anno: 2000,
pagine: 25 - 33
SICI:
0967-0262(200002)35:1<25:FODTCC>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
HIGHER-PLANT CELLS; ROOT-TIP CELLS; MICROTUBULE ORGANIZATION; APICAL CELLS; RHODAMINE-PHALLOIDIN; CONTRACTILE RING; SEPTUM FORMATION; FUCOID ZYGOTES; CORTICAL ACTIN; FISSION YEAST;
Keywords:
actin microfilaments; cell cycle; cytochalasin B; cytoskeleton; cytokinesis; Phaeophyceae; Sphacelaria;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
63
Recensione:
Indirizzi per estratti:
Indirizzo: Katsaros, C Univ Athens, Fac Biol, Dept Bot, Athens 15784, Greece Univ Athens Athens Greece 15784 pt Bot, Athens 15784, Greece
Citazione:
D. Karyophyllis et al., "F-actin organization during the cell cycle of Sphacelaria rigidula (Phaeophyceae)", EUR J PHYC, 35(1), 2000, pp. 25-33

Abstract

The organization of F-actin in vegetative cells of the brown alga Sphacelaria rigidula was studied after staining with a modified rhodamine-phalloidin (Rh-Ph) protocol. The interphase vegetative cells display a well-organized F-actin cytoskeleton, consisting of cortical, endoplasmic and perinucleararrays of actin filaments (AFs). The organization of these AFs changes slightly during mitosis, while they almost disappear at cytokinesis. The perinuclear AF population becomes more obvious during prophase, especially at the poles. At metaphase, an actin spindle is organized, co-localized with themicrotubule spindle, while at anaphase an interzonal AF population appears, which persists at early telophase. At advanced telophase the image changes to a rather diffuse actin meshwork in the mid-area between the daughter nuclei. During post-telophase-early cytokinesis this AF system becomes gradually disassembled and a conspicuous actin plate is formed on the cytokinetic plane. This plate becomes more compact with the progress of cytokinesis, and seems to overcoat the patches of the forming diaphragm, and finally thedaughter plasmalemmata. Treatment with cytochalasin B disturbs mitosis, not allowing the cells to proceed to anaphase, and prevents cytokinesis. These observations show that AFs are ubiquitous cytoskeletal elements of the vegetative cells of brown algae. The probable role of AFs during the cell cycle and particularly the unique actin configuration involved in cytokinesis are discussed.

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Documento generato il 28/03/20 alle ore 09:58:07