Metabolism of pollen tubes, Biology

Metabolism of Pollen Tubes

Pollen grains contain auxins, and gibberellins which are known to be involved in post- pollination enlargement of the ovary and the development of the fruit. Pollen from unrelated species, nonviable pollen or even pollen extracts can prevent abscission and cause swelling of the ovary and formation of near-normal but seedless fruits.

The initial and small amounts of auxins such as IAA or other auxin-like substances and GA supplied by the germinating pollen to the pistil serve to initiate some minimal growth and metabolic processes as a result of which enzymes liberate additional amounts of auxin from the tissue of the style and the ovary, e.g., Nicotiana tabacum. The auxin released initiates growth also in the fertilized ovules which later produce appreciable amounts of auxins and gibberellins in the endosperm, and auxins and cytokinins in the developing embryo. Thus, the initial supply of auxins and gibberellins from germinating pollen not only triggers the development of the fruit but is also responsible for the subsequent release and production of additional amounts of plant growth regulators in the pistil tissues.

Posted Date: 1/23/2013 4:27:37 AM | Location : United States

Related Discussions:- Metabolism of pollen tubes, Assignment Help, Ask Question on Metabolism of pollen tubes, Get Answer, Expert's Help, Metabolism of pollen tubes Discussions

Write discussion on Metabolism of pollen tubes
Your posts are moderated
Related Questions
Relation between taxonomy and ecology

Foods with moderate amounts of protein can be eaten in limited amounts. These foods include grains, bread, pasta, rice, potatoes, corn, and peas. Foods with little or no protein ar

Explain the term- Horizons These processes take a long time- may be a few thousand years to create a soil. As the time passes, the soil matures and generally becomes deeper and

Q. What are the stages of mitosis? Mitosis involves replication of DNA and its separation into two new daughter cells. Whereas only four phases of mitosis are often listed. Ent

Q. How different are fecundation in chondrichthyes and in osteichthyes? In chondrichthyes fecundation is internal by resources of copulation. In osteichthyes fecundation genera

Q. Which is the brain region responsible for the coordination and equilibrium of the body? In the central nervous system the cerebellum is the main controller of the motor equi

Pre-conditions for GTT You are advised to carry out the GTT (OGTT) test to confirm a diagnosis of diabetes mellitus for a person with: a) The history of glycosuria (glucose

Ask questiRed-green color blindness is an X-linked recessive disorder. If Allison is heterozygous (a carrier), and her husband, Michael, is NOT colorblind. What is the chance that

B l ac k q u ar t e r The disease is otherwise known as black leg or emphysematous gangrene, and it is associated with severe toxaemia, emphysematous swelling of muscl

Give three ways in which a plant might be adapted to a hot dry environment. A plant might be adapted to a hot dry environment by having a decreased leaf area, waxy cuticle to