Cytokinesis in microsporocyte
meiosis is of the simultaneous type, and the micropore tetrads are tetrahedral.
In Collomia grandiflora (Polemoniaceae), an earlier onset of CL anther differentiation (predisplacement) (Hill & Lord, 1990; Lord et al., 1989), or a slower developmental rate (neoteny) and a shorter developmental duration (progenesis) between archesporial cell differentiation and microsporocyte
meiosis in CL anthers (Lord et al., 1989; Minter & Lord, 1983) are responsible in CL flowers for the precocious anther maturation and smaller ma ture anther size (about half the size of CH flowers) with fewer pollen grains (only 1/10th the number of CH flowers).
: Microspore mother cell, this diploid cell undergoes meiosis to produce four haploid microspores in the anthers of angiosperms.
Primary sporogenousa cells were developed directly as microsporocytes
. Although the anther ontogeny and microsporogenesis in S.striata is a continuous process for descriptive purposes of the structure and ultrastructural details, we distinguished five stages of development: microspore mother cell stage followed by meiosis, tetrads, free young microspores, vacuolated pollen, and mature pollen grains at dehiscence.
undergoes meiosis and produced microspore tetrad.
Heslop-Harrison (1968) reported from electron microscopic studies that the critical pattern-determining stage in pollen wall and spine formation occurred very early in development, implying that control is exerted by the sporophyte, i.e., the microsporocyte
, and perhaps other micrmporangial tissues such as the tapetum.
Is the special callose wall of microsporocytes
an impermeable barrier?
Microspores and pollen grains are produced from pollen mother cells (Microsporocytes
), PMCs within loculus anthers of the flower.
The cells in the sporogenous areas that undergo meiosis are called microspore mother cells, or microsporocytes
. Each diploid microspore mother cell produces four haploid microspores.
Cytomixis in maize microsporocytes
. Cytologia, Tokyo, v.62, p.351-355, 1997.
This may be the result of several factors: (i) a shift in glyphosate transport away from vegetative tissues and toward reproductive tissues (Pline et al., 2001); (ii) the greater sensitivity of reproductive tissues relative to vegetative tissues in plants carrying GT constructs (Pline et al., 2002); and (iii) the high susceptibility of microsporocytes
to glyphosate during microsporogenesis (Pline et al., 2002).