In this article we will discuss about the functions of tapetum. Many physiological functions have been accredited to the tapetum, but they all congregate on the ability of its cells to synthesize metabolites for the nourishment of microsporocytes, regulation of meiosis, pollen wall formation, synthesis of pollenkitt, etc. Experimental approach to establish tapetal function in a convincing way has come [...]
In this article we will discuss about:- 1. Morphology of Orbicules 2. Development of Orbicules 3. Functions. Ubisch bodies were first discovered by Rosanoff (1865) in close association with the tapetum. Kosmath (1927) suggested that these bodies should be called "Ubisch granules" while Erdtman (1961) proposed the term "orbicules". Morphology of Orbicules: Orbicules are small and generally spherical structures (2-5 [...]
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 [...]