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 basis of oxygen requirement for growth, Q. Microorganisms...

Q. Microorganisms on basis of oxygen requirement for growth? On basis of oxygen requirement for growth: - Obligate Aerobes: Require oxygen for growth and multiplication e.g

Define fluconazole, Define Fluconazole It is a weaker inhibitor of CYP...

Define Fluconazole It is a weaker inhibitor of CYP3A4 than itraconazole or ketoconazole but may still increase serum concentrations of drugs metabolized by 3A4, like cyclospor

Some common air pollutants: hydrocarbon, Hydrocarbon (HC): Hydrocarbons ...

Hydrocarbon (HC): Hydrocarbons such as methane, ethylene, acetylene is present in air. Most of these are low molecular weight gases and liquids at ordinary temperature. Sour

What are stomata, What are stomata? How do these structures participate in ...

What are stomata? How do these structures participate in the plant transpiration? Stomata (singular, stoma) are small specialized passages for water and gases there in the epid

Explain measles, Measles Adults born after 1956 who have not received ...

Measles Adults born after 1956 who have not received 2 doses of live measles vaccine (not the killed vaccine that was commonly used in the 1960s) after their first birthday an

Explain techniques for broken instrument removal, Explain Techniques for Br...

Explain Techniques for Broken Instrument Removal Described by Gary Carr Staging platform (cutting in flat surface) a) Create straight line access to separated file using mod

Describe pulsation in cardian examination, Describe Pulsation in cardian ex...

Describe Pulsation in cardian examination? 1) Apex impulse; lowest and outermost point of definite cardiac pulsation. 2) Prominent pulsations in left parasternal region suggest

Explain indifferences in ionic composition, Indifferences in ionic composit...

Indifferences in ionic composition Answer A. across membranes can be created through the action of ATP driven pumps as long as number of negative and positive ions on remain equal

What is uric acid , Uric acid is the main nitrogenous waste product o...

Uric acid is the main nitrogenous waste product of uricotelic organisms (birds, insects and reptiles), but is also established in ureotelic organisms from the breakdown of the puri

Show the difference between sperm and spermatids cells, Q. What is the diff...

Q. What is the difference between sperm and spermatids cells? What is the name of the transformation of spermatids into sperm cells? Sperm cells (the male gametes) are matured

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