Procedure of hormone act, Biology

Procedure of Hormone Act

All plant hormones show extraordinary varied complex effects in controlling plant growth and development, Extrapolation from how an animal hormone works a common framework for different plant hormones may explain their varied effects. In animals, the wide variety of effects shown by different hormones is understood by the mechanism of action at the cell level. You may recall that the target cells have appropriate receptors for hormones either on the plasma membrane or are located generally in the interior of the cell. Similar attempts have been made to explain the mechanism of action of plant hormones employing the receptor concept. Both natural and synthetic hormones behave in a similar way as it is assumed that they bind to specific receptors to form a hormone receptor complex to trigger an effect.

Though search for a receptor protein has been generally a frustrating one, recently, such proteins have been demonstrated in pea which bind with auxins before eliciting a response such as embryoid differentiation in tissue culture. Cell elongation, the most well-known response of auxin, requires that the longitudinal wall stretches, which will involve basic changes in cell wall. In order to stretch, cell wall has to become more plastic, just like a balloon, in which the driving force to increase the volume is proportional to the resistance offered by the balloon wall. Increased plasticity of the cell wall by auxin is considered to be due to breaking of some of the bonds between the polysaccharide components of the cell wall. As it becomes plastic the cell is amenable to stretching. The structure of gibberellin resembles certain animal steroid neurotransmitters.

The search for gibberellin receptor in cytoplasm rather than in the membrane has not been fruitful unlike animal neurotransmitters which bind to cytoplasmic receptors. Though the biochemical mode of action of plant hormones is poorly understood, still the general assumption in current research work is that plants cells have specific receptors which when bound to hormones activate the signal transduction pathway for various activities. However, though many proteins have been found by various workers to bind with hormones, these may be inactive complexes. Currently search is on to identify the nature of the receptor and decipher its mode of action.

Posted Date: 1/17/2013 6:18:52 AM | Location : United States







Related Discussions:- Procedure of hormone act, Assignment Help, Ask Question on Procedure of hormone act, Get Answer, Expert's Help, Procedure of hormone act Discussions

Write discussion on Procedure of hormone act
Your posts are moderated
Related Questions
Q. What do you mean by Overgloves? The purpose of these gloves is to use time more efficiently and to protect the skin on the hands through minimizing the number of times that

What is an Erlenmeyer flask and how is it used? It is same to a beaker, except that it gets narrower at the top. It is use to hold liquids and do reactions in it.

Q. Can you explain Secondary Metabolites? Secondary metabolites or secondary plant products are those macromolecules that lack nitrogen and arc of restricted occurrence and the

A complete motor neuron is removed from a frog and placed in a large volume of normal physiological saline.  The neuron is healthy; it has a stable resting voltage of -70 mill

What is Mitosis? Mitosis is a process whereby a cell that is preparing to divide separates the duplicated pairs of chromosomes from each other so that each of the new daughte

REDISCOVERY OF MENDEL'S LAWS (THE BIRTH OF GENETICS) 1.         It was in 1900 that three botanist independently rediscovered the principles of heredity already worked out by M

Which process may not reduce the toxicity of a chemical in the body?

Foscarnet  (Foscavir)  Foscarnet is an alternative to ganciclovir and valganciclovir for treatment of CMV infection. It is approved for use in CMV retinitis, including progress

DEVELOPMENT OF GENETICS-A HISTORICAL PERSPECT As systematic study of genetics began, answers were sought to questions such as i) why are we like our parents? ii) why do org

Calculate the osmolarity of a solution of 5% dextrose in water (dextrose = glucose, molec. Wt. = 180).