Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
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.
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.
Q. Bitter Taste? Bitterness is an inherent property of a substance. It is due to substances such as alkaloids present in food. For example, tannins present in tea, coffee, frui
Agroup of realated genera are classified as-?
Dracunculiasis (guineaworm infestation) Dracunculiasis, a disease of man, which has been known since antiquity, is caused by the nematode parasite Dracunculus medinesis. The p
Fatty acid breakdown brings about the oxidation of long-chain fatty acids. The fatty acids are first transformed to their acyl CoA (coenzyme A) derivatives and then degraded by the
what are the general characters of nonchordates, explain
You are studying a gene, and its effects on skin cells. You want to find out A) If the protein made encoded by this gene binds to DNA in a particular place B) if the protein binds
When resheathing needles, simple precautions to prevent injuries are to: 1. use only one hand to scoop the cap 2. hold the sheath with a hemostat (suggested but will require
Explain Community dietitians Community dietitians or nutritionists may counsel individuals and groups on sound nutrition practices to prevent disease, maintain healt
Types of Variations - Somatogenic and Blastogenic Variation Changes in somatic parts of the body are somatic variations e.g. wrestler's muscle, circumcised penis of mus
Late recurrence of artgirza: This is a reflection of progress of disease in the native coronary arteries distal to the grafts or narrowing or blockage of one or more of the g
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!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd