Procedure of hormone act, Biology

Assignment Help:

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.


Related Discussions:- Procedure of hormone act

Determine the types of neuropsychology, Determine the types of neuropsychol...

Determine the types of neuropsychology The practise in neuropsychology is roughly divided into two approaches. Some practitioners use standard comprehensive neuropsychological

Definition of counselling, Q. Definition of Counselling? Counselling ha...

Q. Definition of Counselling? Counselling has been defined as a process of helping/enabling a person/people solve certain interpersonal (not able to continue relationship), emo

Define meiosis, Give two examples in each case of organs or tissues in whic...

Give two examples in each case of organs or tissues in which you would expect  (a) meiosis,  (b) mitosis to be taking place   a) Meiosis is likely to

Explain the infraorbital nerve and vessels, Infraorbital nerve and vessels ...

Infraorbital nerve and vessels The infraorbital nerve exits through the infraorbital foramen. This foramen and the neurovascular contents are within 5 to10mm of extremely resor

Water - properties and functions, W A TER Occurence Water is ...

W A TER Occurence Water is the most abundant substance, covering 70% of earth's surface. It constitutes 60-90% of living cells.              5-6% in tooth e

To study the gas produced when yeast acts on sugar, To study the gas produc...

To study the gas produced when yeast acts on sugar Place some clear lime water in a test tube and have a pupil exhale by a soda straw placed in the lime-water. Soon the lime-wa

Regulation of pyruvate kinase, Regulation of pyruvate kinase, pyruvate carb...

Regulation of pyruvate kinase, pyruvate carboxylase and PEP carboxykinase A) In liver,  pyruvate  kinase  is inhibited  by high levels  of ATP and alanine  so which  glycolysis

Determine procedure for determination of protein content, Determine Procedu...

Determine Procedure for determination of protein content? Now carry out the procedure as enumerated herewith: 1. Preparation of standard albumin: A standard solution of 2 mg

Define interaction of vitamin c with riboflavin, Define interaction of Vita...

Define interaction of Vitamin C with Riboflavin? The two coenzyme forms of riboflavin are FMN and FAD. They are found in a large number of systems which function in the metabol

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