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

Explain dental care delivery system, Explain Dental Care Delivery System ...

Explain Dental Care Delivery System In the dental care delivery system: there are: patients, insurance payers and dentists For patients: Success = function + esthetics

What is cardiac transplantation , What is Cardiac Transplantation ? ...

What is Cardiac Transplantation ? Cardiac Transplantation :  The first successful clinical heart transplant was done by Christian Bmnard at Cape Town in South Africa in 196

Is hemoglobin binds o2 more tightly at ph 7.2, Which of the following state...

Which of the following statements is correct? A. Hemoglobin binds O2 more tightly at pH 7.2 than at pH 7.4. B. Fetal hemoglobin under physiological conditions binds O2 more t

Why does thermal inversion increases air pollution, Q. Why does thermal inv...

Q. Why does thermal inversion increases air pollution? What harm can thermal inversion cause to humans? The Thermal inversion confines at low altitude a layer of pollutants tha

What are the factors to measure such a prediction, You are interested in pl...

You are interested in plant life history evolution, you come across a population of the California poppy that i spolymorphic (mixed) for both iteroparous ans semeparous individuals

Natality rate - natality, Natality Rate - Natality Natality rate or bi...

Natality Rate - Natality Natality rate or birth rate is determined by dividing the number of individuals born by unit time and is expressed as follows: Natality rate =  ΔNn

Explain procedure for detection of metanil yellow, Explain Procedure for De...

Explain Procedure for Detection of Metanil Yellow? Carry out the exercise following the steps enumerated herewith. 1. Suspend the food sample in water and shake vigorously.

How the blood sugar level is maintained at a stable level, Discuss how the ...

Discuss how the blood sugar level is maintained at a stable level in the well fed and fasting state In  the fed state, clearance of blood  glucose is mainly by  liver via gluc

What is the difference between the concepts of genome, Q. What is the diffe...

Q. What is the difference between the concepts of genome and karyotype? Genome is the set of DNA molecules that characterizes each species or each living being. The concept the

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