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

Design a controlled experiment, Design a controlled experiment to test the ...

Design a controlled experiment to test the hypothesis that acid precipitate inhibits the growth of elodea, a common freshwater plant.

Explain about the derived proteins, Explain about the Derived Proteins? ...

Explain about the Derived Proteins? These are not naturally taking place proteins and are obtained from simple proteins by the action of enzymes and chemical agents, heat, mech

Bluetongue, B l u e t on g u e Bluetongue (BT) is a non-contagi...

B l u e t on g u e Bluetongue (BT) is a non-contagious and arboviral disease of both domestic and wild ruminants. The disease is enzootic in areas where reservoirs (cat

Enumerate the term - brain behaviour functioning, Enumerate the term - brai...

Enumerate the term - brain behaviour functioning The brain may be thought of as a "dependant variable" that is shaped in part by the facilitative stimulation that is experience

Define advantages of using yeast as a source of protein, Define Advantages ...

Define Advantages of using Yeast as a source of Protein? 1. Large size, hence separation from the culture medium is easy. 2. As the pH of the growth is towards acidic side,

Explain the occurrence of nictoinic acid, Explain the Occurrence of Nictoin...

Explain the Occurrence of Nictoinic acid Nictoinic acid occurs widely in the animal and vegetable kingdom in free as well as in bound form (in enzymes). Several animal organs

Female reproductive system - graffian follicle, GRAFFIAN FOLLICLE - ...

GRAFFIAN FOLLICLE - It appears as knob or stigma in medulla. It is round, discovered by Graff. It is covered by 2 layers - thecae externa & theca interna. From theca i

Do platyhelminthes have an excretory system, Q. Cnidarians and Poriferans d...

Q. Cnidarians and Poriferans do not have excretory systems. Do platyhelminthes have an excretory system? Platyhelminthes have a primitive excretory system made of flame cells

What does the formula dpd = sf - tp signify, Q. What does the formula DPD =...

Q. What does the formula DPD = SF - TP signify? DPD is the short form of diffusion pressure deficit, SF (suction force) is the vacuolar osmotic pressure and TP is the turgor pr

The genetic code within a dna molecule, How is a genetic trait determined b...

How is a genetic trait determined by the genetic code within a DNA molecule? A DNA molecule has 4 dissimilar bases, either CGTA. Any specific combination of these things forms

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