Coenocyte

(redirected from coenocytic)
Also found in: Dictionary, Medical.

coenocyte

[′sē·nə‚sīt]
(biology)
A multinucleate mass of protoplasm formed by repeated nucleus divisions without cell fission.

Coenocyte

 

in animals, a type of tissue structure characterized by the absence of cell boundaries and the distribution of nuclei in a dense mass of cytoplasm. Examples of coenocytes include striated muscle fibers, the embryos of certain insects in the early stages of development, and certain protozoans, including many infusorians. Some tissues, for example, the epithelial intestinal lining of many mollusks and insects, have alternating cellular and coenocytic structures at various stages of digestion. A coenocyte may be formed by cell fusion or by the multiplication of nuclei without subsequent plasmotomy or cytotomy.

In plants the polynuclear protoplast of organisms having no cell structure, for example, Caulerpa, is referred to as either a coenocyte or syncytium. In multicellular plants the term “coenocyte” refers to the protoplasmic contents (including nuclei) of fused cells, for example, jointed lactiferous vessels, as well as to the aggregate of protoplasts connected by protoplasmic threads (plasmodesmata).

Mentioned in ?
References in periodicals archive ?
Collectively, the use of this methodology could also be useful for the co-detection of acidic components naturally occurring in coenocytic structures of green seaweeds, as already reported for SPs isolated from other natural sources (Volpi & Maccari, 2002; Rodrigues et al.
An anti-dengue and anti-herpetic polysulfated fraction isolated from the coenocytic green seaweed Caulerpa cupressoides inhibits thrombin generation in vitro.
gnemon is a single large coenocytic cell containing hundreds of free nuclei [ILLUSTRATION FOR FIGURE 2 OMITTED].
The entire female gametophyte is coenocytic and there is no evidence of archegonial structure or differentiated egg cells [ILLUSTRATION FOR FIGURE 4B OMITTED].
Most free nuclei remain in situ within the parietal band of cytoplasm in the vacuolate micropylar portion of the female gametophyte and cellularization of this coenocytic tissue was not observed, except in the immediate vicinity of the zygotes.
In cycads and Ginkgo, female gametophytes are monosporic in origin and pass through an initial coenocytic phase in which free nuclei are positioned in a parietal band of cytoplasm that surrounds a single central vacuole [ILLUSTRATION FOR FIGURE 7A OMITTED].
These somewhat loosely defined haustoria are not strictly comparable with the chalazal and micropylar endosperm haustoria found in many Asteridae, such as Lamiaceae (Rudall & Clark, 1992), where distinct well-defined endosperm chambers are formed, often containing a few large coenocytic nuclei which may wander around the periphery of the haustorium.
Heterokaryon formation, the formation of a coenocytic state where two (or even more) genetically different haploid nuclei are present, is typical for the fungi.
crispata eats a variety of ulvophytic, coenocytic algae; but whether it retains chloroplasts from multiple algal species is unknown and is a matter that we are currently investigating.
Chemical composition of the wound plug and entire plants for species of the coenocytic green alga, Caulerpa.