Acetabularia


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Acetabularia

 

a genus of green algae found in tropical and subtropical seas. The genus includes 21 species. An adult organism of this genus consists of a lobed, rhizoidal base, a cylindrical stalk, and a cap formed by a verticil of connate and unconnate game tangia. In the rhizoidal portion of the single-celled thallus there is one giant nucleus with a developed nucleolus. After the cap is almost completely formed, the nucleus divides repeatedly, and numerous nuclei migrate through the stalk into the gametangia, which are separated by septa. The contents of the gametangia divide into numerous thick-walled cysts, in which meiosis then occurs. In the autumn, after the decomposition of the thallus, the cysts are released and then hibernate; in the spring they germinate, forming biflagellate gametes. The gametes copulate, forming a zygote which during the first year grows into a branched rhizoid with a vertical axis. The latter dies, while the remaining basal portion which contains the nucleus hibernates; the next spring it starts a new vertical axis, which forms one or several sterile verticils on the top. Each verticil of gametangia is preceded by one sterile verticil which drops off. Under laboratory conditions, the life cycle of Acetabularia can be reduced to six months. Acetabularia is a favorite research subject in investigating the interaction between the nucleus and protoplasm.

Kursanov, L. I., and N. A. Komarnitskii. Kurs nizshikh rastenii, 3rd ed. Moscow, 1945. Pages 84–86.

N. P. GORBUNOVA

References in periodicals archive ?
Agardh Dasycladaceae Neomeris annulata Dickie * * Polyphsaceae Acetabularia pussilla M.
One of the most carefully analyzed examples of this is the formation of whorls in the algae Acetabularia and its relatives.
Low Level Luminescence of Acetabularia Acetabulum as a tool for Evaluating the Quality of Cosmetic Ingredients, in: Proceedings 17th IFSCC International Congress, Yokohama (Japan), October 13-16, 1992.
These trends were even more evident for Acetabularia acetabulum [ILLUSTRATION FOR FIGURE 5 OMITTED].
In contrast, Padina pavonica and Acetabularia acetabulum, which release reproductive structures shortly before they become senescent, colonized plots cleared in December.
The view of development as a process of self-organization has inspired Goodwin's empirical work on morphogenesis in the unicellular green alga, Acetabularia acetabulum.
Goodwin has sought to describe mathematically the cellular interactions responsible for cap regeneration in Acetabularia.
Garcia E, Reyes R (1996) Bioconcentration of mercury in Acetabularia calyculus: Evidence of a polypeptide in whole cells and anucleated cells.
Garcia E, Reyes R (1998) Induction of mercury-binding peptide in whole cells and anucleated cells of Acetabularia calyculus.
Mexico Afinidad # de Biogeografica Catalogo DIVISION CHLOROPHYTA CLASE ULVOPHYCEAE ORDEN ULVALES Familia Ulvaceae Enteromorpha intestinalis (Linnaeus) Link Cosmopolita 2130 Ulva lactuca Linnaeus Cosmopolita 2131 ORDEN CLADOPHORALES Familia Cladophoraceae Chaetomorpha linum (Muller) Kutzing Templado 2132 Cladophora columbiana Collins Templado 2133 Cladophora microcladioides Collins Templado 2134 ORDEN SIPHONOCLADALES Familia Siphonocladaceae Dictyosphaeria cavernosa (Forsskal) Borgesen Tropical 2135 ORDEN DASYCLADALES Familia Dasycladaceae Acetabularia calyculus Quoy & Gainard Tropical 2136 Neomeris annulata Dickie Tropical 2137 ORDEN CAULERPALES Familia Caulerpaceae Caulerpa racemosa (Forsskal) J.
Agardh (T:98) P L Dasycladus vermicularis (Scopoli) Krasser (T:99) P L *Neomeris annulata Dickie (T:101) C L, F *Cymopolia barbata (Linnaeus) Lamouroux (T:102) P L Acetabularia crenulata Lamouroux (T:105) P L Order Cladophorales Family Valoniaceae *Ventricaria ventricosa (J.