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.
How to determines the actual availability of nutrients The amount of a particular nutrient determined analytically does not necessarily represent what is available but is merel
Role of Chemical Factors in Controlling Apical Dominance There were indications about the existence of plant hormones in the last part of 19th century. The plant hormones had
Q. Enlist the modalities available for hand wash? Modalities available for hand wishing are a) 2-4% Chlorhexidine b) 0.3-1 %Triclosan c) 0.6% Parachlorometaxylenol (PC
physiological adaptation of parasites for infectiousness?
Is the bacterium MRSA pathogenic or non-pathogenic? MRSA bacteria are pathogenic. This group of bacteria belongs to Staphylococcus aureus family, which have grown resistant to
Explain the Donnan Membrane Equilibrium? If one of the solutions in a two-phase membrane equilibrium contains certain charged solute species that are unable to pass through the
One of the free-living, anaerobic nitrogen-fixer is: 1. Beijernickia 2. Rhodospirillum 3. Rhizobium 4. Azotobacter Rhodospirillum
Exudate gums Most exudates gums come from compounds produced when the plant is wounded and these substances seal the wound. Most widely used exudate gum is 'gum Arabic' exuded
NASA L CHAMBER - External nares are 2 in number, i.e., dirhynous. Situated at lower side of nose. Open into nasal chamber. Nasal chamber opens into pharynx by internal n
Define Dietary and Non Dietary Factors - Causation of Cancer? Several dietary and non-dietary factors (including genetics) can increase the risk in the causation of cancer. Som
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