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

What is biological contaminants, Q. What is Biological Contaminants? Yo...

Q. What is Biological Contaminants? You may recall reading about food borne diseases caused by the consumption of contaminated food items in the last unit. In the

External sources for health care, Normal 0 false false fals...

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Explain significant proportion of starch in the normal diet, Significant pr...

Significant proportion of starch in the normal diet A significant proportion of starch in the normal diet escapes degradation in the stomach and small intestine and is labeled

Explain somatic cell, For a somatic cell with 2n = 4, which of the followin...

For a somatic cell with 2n = 4, which of the following is true? (Note: G1- growth phase 1, G2 - growth phase 2, M - metaphase, P - prophase and T - telophase) a.  (Number of

Prophase of karyokinesis, 1. This is very prolonged phase, and differs from...

1. This is very prolonged phase, and differs from the prophase of mitosis, because in this Chromosomes behave as homologous pairs. 2. Each diploid cell has two chromosomes of ea

Mechanism of gastrulation, MECHANISM OF GASTRULATION - It is most im...

MECHANISM OF GASTRULATION - It is most impotant stage of embryonal development, in which single layered blastula converts into 2 or 3 layered gastrula. During this stage,

Plant cell under hypotonic medium, Q. How does the plant cell wall act in r...

Q. How does the plant cell wall act in response when it is placed under hypotonic medium? The plant cell wall (the covering of the cell external to the cell membrane) is made o

Bracketed keys to identifying plants and animals, Q. Bracketed Keys to iden...

Q. Bracketed Keys to identifying plants and animals? In bracketed keys two couplet leads of the same rank are bracketed together. The alternative clues or couplets are written

Hydrarch - kinds of succession, Hydrarch - Kinds of Succession When su...

Hydrarch - Kinds of Succession When succession takes place in a wet area, that is, succession progresses from hydric to mesic conditions. This can be further subdivided as:

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