In this article we will discuss about:- 1. Callose Wall and Meiocytic Syncytium 2. Ultra-Structural Changes in Microsporocytes 3. Cytokinesis. The sporogenous cells generally function directly as microspore mother cell, also called microsporocyte or pollen mother cell. They undergo meiotic division to give rise to microspore tetrads. This division is of tremendous importance in the life cycle of the Pteridophytes [...]
The tapetum on the basis of its behaviour is divided into two main types: 1. Amoeboid 2. Secretory Tapetum. Type # 1. Amoeboid or Invasive or Periplasmodial Tapetum: This type of tapetum is seen in Alisma, Butomus, Tradescantia, Typha, etc. where, the tapetal cells fuse among themselves to form a tapetal periplasmodium. The protoplast of the fused tapetal cells move [...]
Microsporogenesis and Microspore (With Diagram) ! During the development of the microsporangium, the anther is seen at first as a homogeneous mass of meristematic cells, oblong in cross-section and surrounded by an epidermis (Fig. 404A). It then becomes more or less four-lobed and four longitudinal rows of archesporial cells are differentiated. The archesporial cells are marked off from the surrounding [...]