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(cell and molecular biology)
A thin barrier which is formed across the spindle equator in late cytokinesis in plant cells and within which the cell wall is laid down.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



in higher plants, a formation that arises between the daughter nuclei during cell division and that consists of microtubules, ducts of the endoplasmic network, and tiny pectin granules. In the equatorial plane of the phragmoplast there occurs an aggregation of bubbles, probably derivatives of the Golgi complex, which develop into a cellular septum, that is, a membrane that becomes the cell wall. Cellulose is deposited on both sides of the wall. Gradually, as the cell wall is formed, the phragmoplast moves toward the periphery of the mother cell and continues to function until there is closure of the newly formed cell wall with the membrane of the mother cell.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Phragmoplast formation after second meiosis is complex and is mediated by a quadripolar structure of merged phragmoplasts similar in appearance to the initial QMS.
It delivers the two groups of chromosomes to positions adjacent to the polar furrows midway between pairs of plastids in anaphase and a phragmoplast is constructed in the midzone (Fig.
The first division phragmoplast is very well developed (Fig.
Following meiosis, RMSs emanating from the four nuclei define spore domains in the brief coenocyte and initiate phragmoplasts that mediate cytokinesis (Brown & Lemmon, 1988c; Shimamura et al., 1998).
Following chromosome separation a phragmoplast system develops (Fig.
A distinct phragmoplast develops in the interzonal region in telophase I but no cell plate develops and cytokinesis is simultaneous.
A phragmoplast develops in the interzonal region and expands to the equatorial cleavage furrows (Fig.
27c) and form conspicuous primary phragmoplasts (Fig.
[gamma]-Tubulin organizes phragmoplast microtubules between sister nuclei in telophase II (Fig.
Primary phragmoplasts are initiated in the interzones of spindles and additional microtubules emanating from non-sister nuclei/plastids give rise to secondary phragmoplasts that interconnect the nuclei and define the division planes (Fig.
Phragmoplasts develop between pairs of telophase II nuclei (Fig.
[gamma]-Tubulin localization changes from discrete polar organizers to anastral spindles and phragmoplasts in mitosis of Marchantia polymorpha L.