archespore

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archespore

[′är·kə‚spȯr]
(botany)
A cell from which the spore mother cell develops in either the pollen sac or the ovule of an angiosperm.
References in periodicals archive ?
The parenchyma cells beneath the epidermis of the ovule in the micropyle end developed into an archesporial cell in late April (Fig.
In the nucellus the archesporial cell without periclinal division formed a primary parietal cell that directly developed into a megaspore mother cell on the later-June (Fig.
The number of chloroplasts is reduced from several in the differentiating archesporial cells to only a single plastid in each premeiotic sporocyte.
The final division of the archesporial cells gives rise to daughter cells that depart on different developmental pathways.
Archesporial cells are recognized by their prominent nuclei and compact cytoplasm.
In Convallaria and Canna the archesporial cell divides into a proximal megasporocyte and a distal parietal cell, which then repeatedly divides anticlinally to form a single layer of cells between the megasporocyte and the nucellar epidermis.