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

Rassenkreis and speciation, According to the current concept of speciation,...

According to the current concept of speciation, a widely distributed species should break up into partially isolated rule species. The different subspecies become differentiated fu

Enumerate the major substrates for gluconeogenesis, Enumerate the major sub...

Enumerate the major substrates for gluconeogenesis The major substrates for gluconeogenesis are the glucogenic amino acids, lactate  glycerol and (important  in ruminant) propi

Explain shannon-wiener index, Q. Explain Shannon-Wiener index? This div...

Q. Explain Shannon-Wiener index? This diversity measure is based on information theory of measure of order (or disorder) within a particular system. For our uses, this order co

Discuss fatty acid with free radical, Discuss fatty acid with free radical ...

Discuss fatty acid with free radical The hydrogen is removed from the fatty acid chain to yield a free radical. The removal of hydrogen takes place at the carbon atom next to t

Which of the substances is chromatin made, Q. Which Of the substances is ch...

Q. Which Of the substances is chromatin made? Chromatin is made of the DNA molecules associated to proteins known as histones.

Nursing assessment of acute renal failure, Nursing Assessment If the ...

Nursing Assessment If the cause is due to hypovolemia you may observe the child for dry mucus membrane, poor skin turger, hypotension and oliguria. You should also observe

Define pacinian corpuscules, Q. Define Pacinian corpuscules? Pacinian ...

Q. Define Pacinian corpuscules? Pacinian corpuscules are an example of sensory receptors scattered deep in the subcutaneous tissue underlying skin or in viscera.  These mech

How many progeny flies are expected, How many progeny flies are expected to...

How many progeny flies are expected to have full wings and gray bodies?

What is the role of Naupliar eye, What is the role of Naupliar eye? The...

What is the role of Naupliar eye? The unique eye found in larval stage of the crustacean life cycle. This single compound eye is located medially, and with exception of copepod

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