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

Degradation of fats, Q. Explain Degradation of Fats? Fats are the este...

Q. Explain Degradation of Fats? Fats are the esters of glycerol and fatty acids and are called as 'glycerides'. Fats are susceptable to hydrolysis, oxidation and other che

Explain the mendel''s laws in genetics, Explain the Mendel's Laws in geneti...

Explain the Mendel's Laws in genetics? Based on the results of his experiments, Mendel proposed three laws regarding the inheritance of traits: the Law of Segregation, the Law

Cell, compare and contrast plant cell and animal cell with labeling diagram...

compare and contrast plant cell and animal cell with labeling diagrams

Define historical development of food processing, Define Historical Develop...

Define Historical Development of Food Processing? Food processing began thousands of years ago to help people keep food through the lean seasons. Several methods of preserving

What is excessive fat intake, What is Excessive Fat Intake? Although mi...

What is Excessive Fat Intake? Although minimum amount of fat is essential as calculated above but upper limit of fat should be drawn due to its link with an increased risk of d

Urolithiasis, Ur o l it h i a s i s The presence of calculi (u...

Ur o l it h i a s i s The presence of calculi (urolith) in the urinary system is termed as urolithiasis, and the disease is characterized by distension of bladder and

Which of these lists contains the four postulates, Which of these lists con...

Which of these lists contains the four postulates  of natural selection? Which of these lists contains the four postulates of natural selection? Uniform population, heritable trait

Tolerance range, what is the tolerance range of man and tillapia

what is the tolerance range of man and tillapia

Explain the categories of fats and oils, Categories of Fats and Oils Yo...

Categories of Fats and Oils You already know that fatty acids are the lipid-building blocks. It is customary to divide  the fatty acids into different groups, e.g.,  saturated

Special characteristic of stem cells, What is the special characteristic of...

What is the special characteristic of (a) stem cells, (b) embryonic stem cells? (a) Stem cells can continue to divide throughout their life. (b)The special characteristic of

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