Endothecium - anther wall layers, Biology

Assignment Help:

Endothecium - Anther Wall Layers

The layer of cells lying immediately next to the epidermis is the endothecium, which is responsible for the dehiscence of the anther. It is usually single-layered, but sometimes multilayered as in Nicotiana tabacum. You may recall that the endothecium originates from the PPCs. The endothecium mostly differentiates in the four protuberant or bulging parts of the anther. Sometimes, it also develops near the connective region of the anther. In some plants like Triticale an entire ring of endothecium is present.

1998_Endothecium.png

Figure: (a) Diagrammatic sketch of the transverse section of an anther showing the position of the endothecium (small arrows). Large arrows point to the two dehiscing regions of the anthers showing longitudinal dehiscence. (b) A few endothecial cells enlarged to show the characteristic endothecial thickenings.

The endothecial cells are radially elongated. Their full development is attained by the time the anther is ready to dehisce to discharge the pollen grains. At maturity the endothecial cells can be easily recognized by the presence of fibrous bands. They usually arise from the inner tangential walls. The fibrous bands radiate outwards and upwards ending near the outer wall of each cell. Hence, the inner tangential wall appears thick, whereas the outer tangential wall appears thin. These thickenings contain a high proportion of cellulose and a small amount of pectin.


Related Discussions:- Endothecium - anther wall layers

Peristaltic movements of the intestines, Q. Which is the kind of muscle tis...

Q. Which is the kind of muscle tissue that performs the peristaltic movements of the intestines? The smooth muscle tissue is responsible for the peristaltic movements of the in

Impulse transmission, The conduction of impulse in a nerve fibre is. a elec...

The conduction of impulse in a nerve fibre is. a electrochemical process. Maximum speed of transmission of nerve impulse can be 13 metre/second due to axoplasm is much resistant to

Determine the concept of imitation in the learning process, Determine the c...

Determine the concept of  imitation in the learning process The concept of  imitation in the learning process is also a key developmental concept for infants and young children

Assessment of tubercular meningitis, Assessment   For assessment of cli...

Assessment   For assessment of clinical manifestation of the disease you need to understand three stages of clinical course of the disease which are as follows:  Prodromal

Evaluation of disabilities, Problem: Evaluation of disabilities due to ...

Problem: Evaluation of disabilities due to occupational diseases (a) Describe the following terms: "impairment", "disability "and "handicap" (b) Show how the evaluation o

Explain about the probiotics, Explain about the Probiotics? A mono or m...

Explain about the Probiotics? A mono or mixed culture of living organisms, which when ingested in certain amounts, has a positive impact on host health, beyond conventional nut

Polyphyletic theory, Please I need short notes on polyphylrtic theory

Please I need short notes on polyphylrtic theory

Which equipments are required for stress laboratory, The stress lab must ha...

The stress lab must have the following equipment: 1) A mercury Blood Pressure apparatus. 2) A Bed so that the patients ECG can be recorded in the recovery period in supine po

What is class crinoidea, What is Class Crinoidea? This Class includes t...

What is Class Crinoidea? This Class includes the sea lilies and the feather stars. What makes them different from the other Echinoderms is the placement of their mouth and anus

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