Endothecium - anther wall layers, Biology

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.

Posted Date: 1/23/2013 12:24:59 AM | Location : United States

Related Discussions:- Endothecium - anther wall layers, Assignment Help, Ask Question on Endothecium - anther wall layers, Get Answer, Expert's Help, Endothecium - anther wall layers Discussions

Write discussion on Endothecium - anther wall layers
Your posts are moderated
Related Questions
What are two specific organs that work together to preform a function??

Why is pattern baldness more common in men than in women? Pattern baldness is handled by the allele B. Testosterone interacts with the heterozygous genotype (BB′) to make baldn

Gastrointestinal Antibiotic prophylaxis is recommended for esophageal surgery in the presence of obstruction, which increases the risk of infection. After gas troduodenal surge

The cystic fibrosis allele occurs in European populations with q=0.02, what fraction of this population can be expected to have cystic fibrosis?

Symbiotic interaction - Biological Stress Presence of symbiotic microorganism can result in differential growth stimulation of those plants which can recognise the beneficial

Xerophytes Xerophytes are sometimes loosely defineri as 'plants of dry habitats'. But others have defined xerophytes as 'plants which grow on the substratum that usually beco

Islet of Langerhans: They are insulin-producing tissues. It was discovered by Paul Langerhans in 1869. These cells are in groups and look like islands in the pancreas. There are ab

Actions of Gastrointestinal hormones Secretin is released under acidic conditions (low pH); digested fat or bile initiates production of pancreatic juice low in enzymes but ri

Treatment of Lyme Disease Lyme disease in North America is caused by the spirochete  Borrelia burgdorferi, which is transmitted to humans by Ixodes scapularis or pacificus tick