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

Identical chromatids bound, What is the structure that maintains identical ...

What is the structure that maintains identical chromatids bound? Ans) The structure that handles identical chromatids bound is the centromere.

Portal circulation, POR T AL CIRCULATION When a vein branches into se...

POR T AL CIRCULATION When a vein branches into set of capillary to distribute blood in some parts, such venous circulation is called portal system. Three types of portal syst

Polyphyletic theory - metazoa, Polyphyletic Theory - Metazoa This theo...

Polyphyletic Theory - Metazoa This theory was suggested by Greenheig (1959) and some other workers. According to this theory, sponges, coelenterates, ctenophores and flatworms

Concentration of mental effort, Q. Concentration of mental effort? Atte...

Q. Concentration of mental effort? Attention can be defined as "the concentration of mental effort on sensory or mental events. There are three types of attention selective

Indications for surgery-mitral valve disease, Indications for Surgery :  T...

Indications for Surgery :  The normal mitral valve area is 4-5 cm 2 . Usually symptoms appear when the valve area has become less than 2.5 cm2. Symptoms are present at rest when t

Explain gum tragacanth, Gum Tragacanth  Gum tragacanth, the exudation o...

Gum Tragacanth  Gum tragacanth, the exudation of Astragalus species, is defined as the "dried gummy exudate" obtained from Astragalus gummifer Labillardiere. Gum tragacanth is

What are steroids, What are steroids? What are some examples of steroids wi...

What are steroids? What are some examples of steroids with a biological function? Steroids are lipids based in an angular combination of four carbon rings, three of them made o

Can mitosis occur in haploid cells, Can mitosis occur in haploid (n) cells?...

Can mitosis occur in haploid (n) cells? And in triploid cells? The mitotic cell division can happen in haploid (n) cells, diploid (2n) cells, triploid (3n) cells, etc. Mitosis

What is the significance of water for enzymatic activity, Q. What is the si...

Q. What is the significance of water for enzymatic activity? Enzymes, Biological catalysts, depend on water to reach their substrates and bind to them. There is no enzymatic ac

Write in 5-6 lines about food pyramid, Write in 5-6 lines about food pyrami...

Write in 5-6 lines about food pyramid. The diabetes food pyramid divides food into six groups. These groups vary with each other on the basis of si-e occupied in the pyramid.

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