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.
amphibia class characteristics
Concerning their final products (daughter cells and their ploidies) what are the differences between mitosis and meiosis? In mitosis one cell, for example, with 2n chromosomes,
Q. What are the target tissues and target organs of each adenohypophyseal hormone? GH- bones, muscles and cartilages, Prolactin- mammary glands, ACTH- the cortical portion of t
explain mode of nutrition
Explain the term Blood Pressure in Technical Measurement ? Following techniques are recommended (JNC VII): 1) Patient should be seated in a chair with their backs supported an
List the types of Gellan gum. The three types of gellan gums are: High acetyl gellan (partially deacetylated) Low acetyl gellan (highly deacetylated) High cl
Ecology is divided into two fields: (a)Autecology (b) Synecology (a) Autecology: it deals with life history, population dynamics, behavior etc of a single
Explain the Flower in diversity of life? In order for plants to evolve from an aquatic existence to a terrestrial existence, specific adaptations in their basic modes of reprod
Segments of Environment: The environment is not a simple distribution of gases but is highly complex and structured. It comprises of four segments: Lithosphere
Define the Use of Computers in Numerical Taxonomy The use of computers in numerical taxonomy has made it possible to compare a large number of characters from many organisms wi
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