Fine structure of pollen tubes grown in vitro, Biology

Fine Structure of Pollen Tubes Grown in Vitro

The growth in pollen tubes is exclusively restricted to the tip. Cytochemical analysis reveals the pollen tip zone to be rich in RNA and protein. This zone has numerous vesicles and an elaborate network of smooth membranes. The vesicles appear to rise from the ends of dictyosome cisternae. They coalesce with one another and ultimately contribute their membrane and contents to the compartmented cap covering the growth zone at the tip. The cap and the vesicles contain pectin and the RNA resides in the smooth membranes.

In the region behind the tip the tube contains those organelles present in pollen before germination, as well as numerous amyloplasts. The tube wall is thin (tubes growing in pistil have complex wall). Cellulose is the primary wall component. The cytoplasm of pollen tubes growing in vitro lack microtubules. EM shows that the generative cell is surrounded by its own distinct wall and the cytoplasm is different from the grain proper. It contains a small number of poorly developed organelles which possess little storage material.

Posted Date: 1/23/2013 4:29:12 AM | Location : United States







Related Discussions:- Fine structure of pollen tubes grown in vitro, Assignment Help, Ask Question on Fine structure of pollen tubes grown in vitro, Get Answer, Expert's Help, Fine structure of pollen tubes grown in vitro Discussions

Write discussion on Fine structure of pollen tubes grown in vitro
Your posts are moderated
Related Questions
define and explain Water vascular system with podia and tube-feet madreporite mostly present

Q. What treatment should be used for constrictive pericarditis? Medical Treatment 1) Judicious use of diuretics to alleviate systemic congestion. This may be enough in s

Explain the Stochasticity? Ubiquitous noise in biological systems creates stochastic methods central to modelling attempts. Stochasticity is available at all levels in environm

Q How do cells get energy for their functioning? Cells get energy for their metabolic reactions from the breaking of organic molecules with high energetic content. This energy

Phytoestrogens:- A group of compounds considered to offer protection against cancer.

Transplantation - It is implanting of a living or preserved tissue or organ from one site to another side in the same individual or from one individual called donor to recip


Name some emulsifiers which are present in nature? There are many emulsifiers which are present in nature such as phospholipids e.g. lectin which is present in egg yolk which a

Erythropoietin (EPO) A. acts by increasing the production of red blood cells by cells in the bone marrow. B. is secreted by peritubular interstitial cells of the kidney cort

Q. Give some Chlorine-releasing compound? Of all the chlorine - releasing compounds, hypochlorites have been the choice disinfectants used in food industry. The hypoc