Biochemical changes, Biology

Assignment Help:

Biochemical Changes

Many workers have tried to follow the biochemical changes that precede flowering and result in meristems which give rise to flowers instead of vegetative structures. In Pharbitis, which is a short-day plant and requires only one dark period for flowering it was found that soon after the dark period, the flowering stimulus begins to move out of the leaves. In this experiment, the plant was given inductive conditions and after specific time intervals, biochemical changes were measured in meristems. An increase in metabolic activity around 40th hour at the floral apex was manifested by an increase in the level of RNA, proteins and ribosomes. Electron microscopic observations also revealed extensive formation of endoplasmic reticulum.

These activities were followed by an increase in DNA synthesis and mitotic activity. At about 88th hour after floral induction, the rate of cell division increased at apical and axillary meristems and the increase in cell division was noticed particularly in the central zone and peripheral zones of apical meristems. Such experiments have also been done in other plants. However, it has not been possible yet to identify which of the RNA or proteins are responsible for the onset of flowering. With the application of newer techniques it has been possible to suggest that there are some specific flowering genes which get switch on after receiving specific light-dark cycle. Although we do not know the products of all these genes, some of them have been shown to code for proteins which regulate transcription.


Related Discussions:- Biochemical changes

Cause of the immunodeficiency presented by aids patients, Q. What is the ca...

Q. What is the cause of the immunodeficiency presented by AIDS patients? The cause of the immunodeficiency obtainable by AIDS patients is the destruction of CD4 T helper lympho

Explain factors influencing food production, Explain Factors influencing fo...

Explain Factors influencing food production? Appropriate food production involves getting an adequate output (i.e. food) using appropriate inputs. An essential requisite for th

Zoonoses disease-yabapox, Yabapox Yabapox is a disease affecting mangabeys...

Yabapox Yabapox is a disease affecting mangabeys, rhesus, cynos, vervets, stumptails, and patas monkeys. It is caused by the Yaba-like disease virus (YLDV) and Yaba monkey tumor v

Sporotrichosis, Sporotrichosis Sporotrichosis is subacute or chronic i...

Sporotrichosis Sporotrichosis is subacute or chronic infectious disease caused by a dimorphic fungus, Sporothrix schenkii which occurs commonly in soil, wood and vegetation. T

Do sponges have circulatory system, Q. Do sponges have circulatory, nervous...

Q. Do sponges have circulatory, nervous and excretory systems? Sponges do not have a nervous system neither excretory system nor circulatory system.

Explain about the serengeti ecosystem, Explain about the Serengeti Ecosyste...

Explain about the Serengeti Ecosystem? The Serengeti ecosystem, one of the most stunning biological communities in the world, was devastated by the introduction of rinderpest f

Define requirements of zinc during pregnancy period, Define requirements of...

Define requirements of Zinc during pregnancy period? Zinc, as a mineral, was found to be associated with foetal growth and birth weight. Low plasma zinc was associated with mor

What are the symptoms of diabetes, What are the symptoms of diabetes H...

What are the symptoms of diabetes Healthy Person P takes a drug that produces a strong effect on the epithelial cells of the kidney collecting duct within one hour and lasts f

Explain principle of fehling''s soxhlet method, Explain Principle of Fehlin...

Explain Principle of Fehling's Soxhlet method (Lane-Eynon method)? Reducing sugars are those which have free sugar groups and hence may be estimated directly by titrating the s

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