Amoeboid tapetum - tapetum, Biology

Amoeboid Tapetum - Tapetum

It is also known as invasive or periplus modial tapetum. This type of tapetum is more prevalent in the monocotyledons (Arum) than in the dicotyledons (Helianthus). In the amoeboid tapetum, there is a break-down of the inner tangential cell wall followed by the enlargement and movement of protoplasts into the anther sac, where they fuse and form periplus modium. The formation of periplus modium occurs at different developmental stages ranging from meiotic prophase to tetrad stage of pollen development, in different species.

In the anther sac, such fused protoplasts or the periplus modia closely surround the developing microspores and play an important role in pollen development. At the tetrad stage the tapetal cytoplasm produces the enzyme callase which breaks down the callose wall around the microspore tetrads, releasing the microspores into the periplus modium. Towards the end of pollen development, the periplus modium degenerates, dries up and becomes coated on the surface of the pollen wall as pollen kitt material.

Posted Date: 1/23/2013 12:35:17 AM | Location : United States







Related Discussions:- Amoeboid tapetum - tapetum, Assignment Help, Ask Question on Amoeboid tapetum - tapetum, Get Answer, Expert's Help, Amoeboid tapetum - tapetum Discussions

Write discussion on Amoeboid tapetum - tapetum
Your posts are moderated
Related Questions
Full - thickness flap with a c-shaped excisional incision In case where there is adequate soft tissue, both in terms of papillary height and labial bulk, the excision of the ep


Q. How to Investigate mitral stenosis by Echocardiography? Echocardiography is diagnostic in mitral stenosis. There is varying degrees of thickening and calcification of leafle

Define about Skeletal system Skeletal system provides framework to the body; supports the soft tissues; protects delicate organs. The skeletal system is made up of bones an

Solubility of Gases in water Most gases which are important for biological processes dissolve readily and specially in water. The solubility of any gas in water generally var


Are proteins with the same number of each different amino acid that form them necessarily identical proteins? Even if many proteins have the similar number of each dissimilar a

Adverse effects of lamivudine  Because lamivudine is also active against hepatitis B virus (HBV), HIV-positive patients with chronic HBV infection may experience a flare of hep

Explain the types of modified gellan gum There are 3 types of modified gellan gum.  (a) High acetyl gellan (partially deacetylated), which provides a thermo reversible gel,

Define the term - lateralisation and localisation Discriminative validity studies including lateralisation and localisation achieved satisfactory results, but the localisation