sporocyte


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sporocyte

[′spȯr·ə‚sīt]
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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We further suggest that the pre-meiotic system of microtubule bands involved in precocious quadrilobing of the sporocyte cytoplasm may have evolved in early land plants and was (Brown & Lemmon, 2011a) transmitted to the later evolving sporophyte generation as a mechanism for control of division polarity in vegetative growth.
Although phragmoplasts typically form between the nuclei after first division, they disperse without directing wall deposition and second division occurs in the undivided sporocyte. The two spindles of meiosis II develop by interaction of microtubules from poles in the spore domains, the prophase spindles themselves are striking examples of BMA, (for example, see Fig.
Spore cleavage is a terre commonly used for cytokinesis following meiosis when the cytoplasm of the sporocyte divides into a tetrad of spores.
As has been previously stated, meiotic cytokinesis in bryophytes is almost always simultaneous and reflects the division planes established by the phenomenon of sporocyte quadrilobing.
The development of sporocyte quadripolarity is initiated with the appearance of girdling bands of cortical microtubules (Fig.
The widespread and conspicuous simple thalloid liverwort Pallavacinia was a favorite subject of the early cytologists who described quadrilobing of the sporocyte and the quadripolar origin of the spindle (e.g.
The bands of microtubules are approximately perpendicular in the isthmus of the tetrahedrally lobed sporocyte, and in the fully lobed sporocyte, appear to constrict the proximal portions of the lobes.
Following definition of the quadripolar sporocyte the girdling bands disappear.
Sequential stages of sporocyte development are seen in longitudinal files of cells produced by the basal meristem.
The influence of quadripolarity on spindle morphology can be seen by comparing metaphase I and II spindles in a fortuitous arrangement of two sporocytes (Fig.
Sporocytes of the bryopsid mosses produce isolating mucopolysaccharide walls within cell walls of the archesporium.
64a) divides once resulting in sporocytes with two plastids while the nucleus is still acentric (Figs.