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

Explain the summary of morbidity in cad, Explain the summary of morbidity ...

Explain the summary of morbidity  in CAD? i) The prevalence of CAD among immigrant Indians is about three-fold higher than in comparable indigenous populations; ii) CAD tends t

Explain in brief about the neuropsychological test batteries, Explain in br...

Explain in brief about the neuropsychological test batteries Neuropsychological tests have the same standardisation requirements as all psychological tests. That is, there is t

What is signifying by concentration gradient, Q What is signifying by conce...

Q What is signifying by concentration gradient? Is it correct or not to refer to "concentration gradient of water"? Concentration gradient is the variation of concentration of

How many different genotypes can the individual present, Considering a pair...

Considering a pair of homologous chromosomes containing a gene having two different alleles how many different genotypes can the individual present? If a gene of a diploid spec

Requirements and recommended dietary allowances (rda), Define Requirements ...

Define Requirements and Recommended Dietary Allowances (RDA)? What do we mean by requirements and RDA? The requirement level is the amount of nutrient needed to be absorbed to

What is Ailing Implant, What is Ailing Implant Ailing Implant : An impl...

What is Ailing Implant Ailing Implant : An implant which may indicate an increased risk for failure, which can be of temporary significance or amenable to treatment and is gene

Explain the dietary fibre and colon cancer, Explain the Dietary fibre and c...

Explain the Dietary fibre and colon cancer? The relationship between colorectal cancer and dietary fibre remains complex. Although a cause-and-effect relationship between fibre

The genetic code within a dna molecule, How is a genetic trait determined b...

How is a genetic trait determined by the genetic code within a DNA molecule? A DNA molecule has 4 dissimilar bases, either CGTA. Any specific combination of these things forms

Body cavity and coelom - metazoa, Body Cavity and Coelom - Metazoa Vac...

Body Cavity and Coelom - Metazoa Vacuoles, spaces, lacunae and cavities have been of importance in all organisms, may it a be plant or animal. All animals have cavities. The c

The rate of germination, You are asked to set up an experiment to investiga...

You are asked to set up an experiment to investigate the effect of temperature on the rate of germination. You place ten soaked peas in every of three flower pots containing moist

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