May 11 ~ May 13###The late uninucleate stage###The megaspore mother cell
meiosis to form tetrad
A sharp correlation was observed between division in microspore mother cells
One of the daughter cells (usually the larger one) is described as a prospective axial cell, and the other is regarded as the mother cell
of the peripheral cells.
On June 20 a typical megaspore mother cell
was first observed which could be easily recognized by its large nucleus with dense cytoplasm (Fig.
If a mother cell
divides symmetrically, many scientists theorized that the offspring inherit cellular components equally ravaged by the experiences of previous generations.
This multilayered tapetum does not develop plasmodesmata at the pollen mother cell
stage but the cell walls break down successively in the layers of tapetal cells, discharging protoplasm into the locule, where it is not enclosed by a perispore membrane [ILLUSTRATION FOR FIGURES 19-23, 34, 35 OMITTED].
These cells are closely arranged in the entire pollen chamber and further develop into microspore mother cell
The meiotic division in the MMC is synchronic with the microspore mother cells
The researchers point out that two daughter cells arise from a single sensory organ precursor mother cell
in the fly peripheral nervous system, and that among the daughter cells, Notch is activated in one and not in the other.
In this primordium, an archeosporial cell produces a megaspore mother cell
, which undergoes meiosis, forming a linear tetrad.
rectisetus parent (PI533028) were squashed in acetocarmine stain to study pollen mother cell
(PMC) meiosis (Liu et al.
Reproductive modifications like apomixis, which involves the parthenogenetic development of apomeiotic eggs of unreduced embryo sacs that arise either from a somatic cell of the nucellus (apospory) or from a megaspore mother cell
(MMC) with modified (meiotic diplospory) or absent meiosis (mitotic diplospory) (Nogler, 1984), have the potential of preserving heterosis over generations (Jongedijk, 1991).