Pollenkitt - pollen wall, Biology

Assignment Help:

Pollenkitt - Pollen Wall

The lipoidal layer found on the outside of the mature pollen grains of many insect pollinated species is known as the pollenkitt. In addition to lipids it is made up of flavonoids, carotenoids and degeneration products of tapetal proteins. The carotenoids are responsible for its characteristic yellow or orange color. The function of pollenkitt is not clear. It is believed to act as an insect attractant, help in pollen dispersal and in protecting against the damaging effects of UV rays. Deposition o flavonoids appear important for the nod functioning of pollen. In maize it has been shown that the pollen grains that lack flavonoids are incapable of developing tubes that are effective in fertilization. Lipids also help in checking water loss after anther dehiscence and discharge of pollen.


Related Discussions:- Pollenkitt - pollen wall

Microorganisms on on basis of nutrient degradation capacity, Q. Microorgani...

Q. Microorganisms on On basis of nutrient degradation capacity? On basis of nutrient degradation capacity: - Proteolytic: Microorganisms, which are capable of protein degra

Explain the techniques of numerical taxonomy, Explain the Techniques of Num...

Explain the Techniques of Numerical Taxonomy Many other techniques of numerical taxonomy are available now, some with special objectives. Classification based on the methods

Locomotor organelles, Locomotor Organelles The protozoan locomotor org...

Locomotor Organelles The protozoan locomotor organelle may be Flagella, Cilia or Pseudopodia. These are of considerable value in classification of protozo

Isomerization of dihydroxyacetone phosphate, Isomerization of dihydroxyacet...

Isomerization of dihydroxyacetone phosphate Isomerization  of  dihydroxyacetone phosphate: Triosephosphate isomerase interconverts  dihydroxyacetone phosphate and  glyceralde

Where does the water resorbed after glomerular filtration, Q. Where does mo...

Q. Where does most of the water resorbed after glomerular filtration go? What are the other substances resorbed by the nephron tubules? Only 0.5 to 1% of the glomerular filtrat

Describe female and male surgical sterilization, Q. What are the most commo...

Q. What are the most common methods of female and male surgical sterilization? Vasectomy is the majority common method of surgical sterilization in men in vasectomy the vas def

Administer accurate and appropriate antibiotics, Administer Accurate and Ap...

Administer Accurate and Appropriate Antibiotics: Appropriate antibiotics to which organism isolated from sputum or bonchoscopic aspirate, is sensitive are administered for 4-6

Define characteristic of doppler echocardiographic, Q. Define characteristi...

Q. Define characteristic of Doppler Echocardiographic? Ans. Doppler findings of cardiac tarnponade are based on the following characteristic respiratory variations in intr

What are the parts of nervous system, What are the parts of Nervous system ...

What are the parts of Nervous system Nervous system is divided into three main parts: 1) The brain and spinal cord or Central Nervous System (CNS). 2) The nerves or Peri

What are the liberate atoms, Does the chemical reaction to unite amino acid...

Does the chemical reaction to unite amino acids incorporate or liberate atoms? What are the chemical entities incorporated or liberated in this reaction? The union of amino

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

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!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd