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

Explain elastase, Elastase The inactive  proelastase  is activated by t...

Elastase The inactive  proelastase  is activated by trypsin to the active form elastase. Elastase attacks  peptide  bonds  next  to  the  small amino  acid residues such  3s  g

State the amount of micronutrients in fertilizers, State the amount of micr...

State the amount of micronutrients in fertilizers The amount of micronutrients in fertilizers must be much more carefully controlled than the macronutrients. The difference be

Explain the types of fats, Jillian and Michael are in their freshman year a...

Jillian and Michael are in their freshman year at college. The two have been friends since grade school and the two of them enjoy getting together for dinner. Michael typically

26 The Human Impact on the Environment, What are the principal sources of e...

What are the principal sources of excessive nitrate and phosphate in rivers and lakes?

Types of joints, 1.      FIBROU S OR IMMOVABLE JOINTS - Occur between ...

1.      FIBROU S OR IMMOVABLE JOINTS - Occur between the bones of cranium & in the tooth suckets commonly in the form of sutures. 2 .      CARTILAGINOUR OR SLIGHTLY MOVAB

What is bioinformatics, The mathematical, statistical and computing methods...

The mathematical, statistical and computing methods that aim to resolve biological queries using DNA and amino acid sequences and related information is called as Bioinformatics.

Explain procedure for gram staining of bacterial cultures, Explain Procedur...

Explain Procedure for Gram Staining of Bacterial Cultures? Now carry out the exercise following the steps enumerated herewith. 1. Prepare bacterial smear on a clean, non-gre

Explain trifluridine, Explain Trifluridine  (Viroptic)  Trifluridine is...

Explain Trifluridine  (Viroptic)  Trifluridine is a nucleoside analog active against herpes viruses, including acyclovir-resistant strains. Marketed in an ophthalmic preparatio

Gram - negative bacteria, Organisms of the so-called HACEK group, (Haemophi...

Organisms of the so-called HACEK group, (Haemophilus, Actinobacillus actinomycetemcomitans, Cardiobacterium hominis, Eikenella species, Kingella kingae) which are part of the upper

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