Phytochrome - floral induction, Biology

Assignment Help:

Phytochrome - Floral Induction

Phytochrome a pigment that exists in two different inter convertible forms was discovered by Hendricks and Borthwrick et. al. and was chemically extracted and purified. Since then exact chemical nature is now established. Phytochrome has two parts the light absorbing portion (chromophore) and the large protein. Action spectra of photoperiodism, germination, and breaking of dormancy etc.-clearly establish phytochrome as the 'photomorphogenesis' pigment as its absorption spectra genuinely overlaps the action spectra of the above phenomenon. Phytochrome was found located mostly in the cell membranes. It exists in red-light absorbing form and far-red light absorbing forms. Phytochrome (R) absorbs red light and is converted into phytochrome (FR), a far-red light absorbing form.

Phytochrome Fr on exposure to far red light is reconverted to phytochrome R. Phytochrome (Fr) can also be converted to phytochrome (R) in prolonged darkness. The action of phytochrome through gene repression and depression production of flowering inducing hormones enzyme activation leading to 'floral apex' from a vegetative apex is roughly understood. But all the steps are not clear yet. Phytochrome regulated morphogenesis results for change in gene 13 transcription. Several phytochrome activated genes have been identified and isolated. One of them is PAL gene.


Related Discussions:- Phytochrome - floral induction

Pisces, what is the mode of nutrition in pisces

what is the mode of nutrition in pisces

Define skirt fold thickness (spt) method, Define Skirt Fold Thickness (S...

Define Skirt Fold Thickness (SPT) Method? Skin fold measurement is the most widely used field method of body composition assessment. The skin fold (SKF) is an indirect measu

What is multi-gated equilibrium radionuclide angiography, Q. What is Multi-...

Q. What is Multi-gated equilibrium radionuclide angiography? Multi-gated equilibrium radionuclide angiography (MUGA) is a very accurate method in measuring ejection fraction. R

Natural control of population growth, N A TURA L CONTROL OF POPULATION G...

N A TURA L CONTROL OF POPULATION GROWTH - 1 .       Biotic potential - It is capacity of population to increase its number by reproduction. For all animals, it is v

Explain stem cell therapy, Stem Cell Stem cell therapy could enable ind...

Stem Cell Stem cell therapy could enable individuals to survive and contribute their alleles to the gene pool who might not have already done so thus increasing genetic diversi

Which hormones produced by ovaries and testicles, Q. What are the hormones ...

Q. What are the hormones produced by the ovaries and the testicles? The testicles make androgenic hormones, the major of them being testosterone. The ovaries produce progestero

How do the bacteria reproduce, Q. How do the bacteria reproduce? Bacter...

Q. How do the bacteria reproduce? Bacteria reproduce by binary fission termed as scissiparity. Some bacteria however present a kind of sexual reproduction transformation, conju

Biting mechanism of snakes, i want to know the contents which i should writ...

i want to know the contents which i should write in my assignment..related to the above topic..

What is the difference between brain and cerebrum, What is the difference b...

What is the difference between brain and cerebrum? What are the main parts of these structures? The concept of brain, or encephalon, comprehends the cerebrum (mostly referred t

Marek''s disease (md), M a r e k ' s disease (MD) It is a lymphop...

M a r e k ' s disease (MD) It is a lymphopoliferative disease of domestic chicken caused by a herpes virus. Of the known 3 serotypes of MDV, Serotype I includes all the o

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