Amoeboid tapetum - tapetum, Biology

Assignment Help:

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.


Related Discussions:- Amoeboid tapetum - tapetum

Explain about the cancer and infertility - obesity, Explain about the Cance...

Explain about the Cancer and Infertility - Obesity? Cancer: Risk of cancers of the colon, rectum and prostrate increases greatly in obese men while obese women are more likely

Explain primary structure of proteins, Explain primary structure of protein...

Explain primary structure of proteins The primary structure of a protein having of the order in which amino acids are bonded to one another by a peptide bond.

Explain procedure for temporary mounts of fungal culture, Explain Procedure...

Explain Procedure for Temporary Mounts of Fungal Culture? (1) Observe mould culture for the colonial appearance and colour. Also observe the underside. (2) Label the clean,

Formation of cocoon in earthworm, Formation of cocoon in earthworm: I...

Formation of cocoon in earthworm: In earthworm segments from 14 to 17 are swollen. Skin on these segments is thick and glandular. This is called clitellum. When ovaries ma

Define short- lived climatic stressful conditions, How do organisms like:- ...

How do organisms like:- a) fungi, b) zooplanktons and c) bears overcome the temporary short- lived climatic stressful conditions? Define.

Striped muscles, STRIPED MUSCLES - These muscles are found in the li...

STRIPED MUSCLES - These muscles are found in the limbs, body walls, tongue, pharynx and beginning of oesophagus and are under the control of animal's will. These muscle f

Explain about the net protein ratio (npr), Explain about the Net Protein Ra...

Explain about the Net Protein Ratio (NPR)? This method was introduced by Bender and Doell (1957) and is a modification of the PER method. In this method, an allowance is made f

Foot as burrowing organ, Foot as Burrowing Organ The Scaphopoda that ...

Foot as Burrowing Organ The Scaphopoda that usually have burrowing habit, possess foot suitably modified for burrowing purpose. The conical and protrusible foot of Dentalium

Culture medium - techniques of plant tissue culture, Culture Medium - Techn...

Culture Medium - Techniques of Plant Tissue Culture In nature green plants are capable of synthesizing organic compounds necessary for their growth and development from the mi

Describe the mechanism responsible for the cessation, Describe a. the facto...

Describe a. the factors responsible for promoting lactation, and b. the mechanism responsible for the cessation of lactation when a mother weans her baby.

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd