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

Define the features of phylum nematoda, Define the Features of Phylum Nemat...

Define the Features of Phylum Nematoda? Phylum characteristics of Nematoda which are the world's most abundant multicellular organisms are as follows: 1. Nematodes occur in

Composed of proteins and dna, Chromosomes, colored bodies, are composed of ...

Chromosomes, colored bodies, are composed of proteins and DNA; so are chromatids. At metaphase I there are 46 chromosomesaligned in pairs along the human cells equatorial plate. At

What is physical accommodation, What is Physical Accommodation Physical...

What is Physical Accommodation Physical Accommodation is the actual physical deformation in the lens power. It is measured in diopters, e.g., if the focussing power of the eye

Carpentier-technique of operation, Carpentier: Edwards or similar annul...

Carpentier: Edwards or similar annuloplasty ring is then sutured into place by interrupted sutures to support the repair and reduce the annulus to a measured amount. The ring m

Explain divisions of the angiosperms, Q. What are the two divisions of the ...

Q. What are the two divisions of the angiosperms? The angiosperms are divided into dicotyledonous and monocotyledonous.

Man-made disasters- fire, A fire hazards is any situation when there is a ...

A fire hazards is any situation when there is a greater risk of harm to the people or the property due to fire. Causes 1.      Overloaded electricity systems. 2.      St

Chemical changes during cleavage, CHEMICAL CHANGES DURING CLEAVAGE - 1....

CHEMICAL CHANGES DURING CLEAVAGE - 1.       Synthesis of DNA occurs. 2.       Synthesis of RNA (rRNA is absent, mRNA & tRNA are synthesized very little amount). 3.

Discuss the principle of osmolarity, These labs discuss the principle of os...

These labs discuss the principle of osmolarity, which is defined as the total number of solute particles in 1 L of solution. Is this the same thing as tonicity? Explain your answer

Explain suturing - endodontic surgery, Explain Suturing - Endodontic Surger...

Explain Suturing - Endodontic Surgery a. Purpose of suturing: approximation of inside tissues and stabilize the flapped mucoperiosteum b. Major problem of suturing in oral t

What are dopaminergic neurons, Q. What are Dopaminergic neurons? Dopam...

Q. What are Dopaminergic neurons? Dopamine Dopaminergic neurons occur in two closely connected groups: Ventral tegmental area (VTA) of the midbrain and Substantia nigra,(i

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