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

What are contraction of sarcomeres of the muscle cells, Q. What are the few...

Q. What are the few examples of movement created by the contraction of sarcomeres of the muscle cells? The handling of a cup of coffee, the peristaltic movements of the bowels,

Plant reproduction, How does being able to reproduce asexually benefit the ...

How does being able to reproduce asexually benefit the plant?

Phylogeny and evolution, While studying evolution, a student comes across a...

While studying evolution, a student comes across a cladogram that includes clades like amphibia, reptilia, aves, and mammalia. What must be the basal clade?

Importance of counselling for diabetic patient, Q. Importance of counsellin...

Q. Importance of counselling for diabetic patient? Diabetes is a life-long illness. Life style modification and precautions taken by the patient can prevent complications and i

Causes of gerd, In addition, pregnancy or constipation may worsen GERD by i...

In addition, pregnancy or constipation may worsen GERD by increasing intra-abdominal pressure. Secondary causes of GERD include reflux caused by acid hypersecretory states, connec

What is allele frequency, What is allele frequency? The Allele frequenc...

What is allele frequency? The Allele frequency is the percentage of appearances of an allele in the genotypes of a given population (compared to the other alleles of the studie

Why is the fish circulation classified as simple circulation, Why is the fi...

Why is the fish circulation classified as a simple and complete circulation? Complete circulation is that in which there is no mixture of venous blood and arterial blood. As ci

What is the function of the flagellum of the sperm cell, What is the functi...

What is the function of the flagellum of the sperm cell? How is it formed? The flagellum of the sperm cell is produced by the centrioles that migrate to the region posterior to

Osmosis, Explain the term osmosis

Explain the term osmosis

Determine what is dermal branchiae, Determine what is dermal branchiae? ...

Determine what is dermal branchiae? External extensions of outer epidermis and peritoneum of the echinoderm body cavity. Both outer epidermis and inner peritoneum are lined wit

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