Synergistic and sequential effects of hormones, Biology

Assignment Help:

Synergistic and Sequential Effects of Hormones

In vitro studies on callus and suspension cultures have brought out two interesting findings. The nature and direction of differentiation is guided by the fact that whether two hormones are supplied together (synergistic effect) or in a sequence (sequential effect). Different effects result depending on whether auxins supply is followed by cytokinins and vice versa. It also matters whether only auxins and cytokinins are supplied together or whether auxins and gibberellins or similar combinations of all the five growth hormones.

The latent built in capacity to grow which resides in the mature cells of carrot or of many other angiosperms may be released by appropriate exogenous stimuli. When growth is so induced the cells respond to normal range of organic and inorganic nutrients and of vitamins if these are furnished under aseptic conditions, F.C. Steward, through his studious efforts spread over years, cultured full grown plants from free cells of carrots in suspension. It is these studies that demonstrated the synergistic and sequential effects of hormones. More of cytokinins and less of auxins stimulate shoot growth and less of cytokinins and more of auxins induce roots. Light is also needed for greening of leaves.


Related Discussions:- Synergistic and sequential effects of hormones

What do you understand by cyanogenic glycosides, Q. What do you understand ...

Q. What do you understand by Cyanogenic glycosides? Cyanogenic glycosides are present in a number of food plants and seeds. Cassava is a staple dietary item in tropical Afri

What are the main human diseases caused by prions, What are the main human ...

What are the main human diseases caused by prions? The main called human diseases of such type are the Creutzfeldt-Jacob disease (CJD), the kuru and the Gerstmann-Sträussle-Sch

What do you mean by trichomoniasis, Q. What is trichomoniasis? Why is it cl...

Q. What is trichomoniasis? Why is it classified as an STD? The Trichomoniasis is an extra-intestinal protozoan infection caused by the Trichomonas vaginalis, a flagellate proto

Action of light the basis of the photosynthesis process, Is it correct to c...

Is it correct to consider water decomposition by the action of light the basis of the photosynthesis process? Besides ADP photophosphorylation, photic energy is also responsibl

Explain cumulative interceptive supportive therapy, Cumulative Interceptive...

Cumulative Interceptive Supportive Therapy (ITI Consensus report) Systematic and continuous monitoring of the periimplant tissue conditions is recommended for the diagnosis of

How hermaphrodite species present cross-fecundation, Is it possible for a h...

Is it possible for a hermaphrodite species to present cross-fecundation? There are hermaphrodite species of animals and plants that present cross-fecundation mainly because of

Roles of glycogen metabolism, Glycogen is a huge polymer of glucose residue...

Glycogen is a huge polymer of glucose residues linked by α1-4 glycosidic bonds with branches every 10 residues or so by α1-6 glycosidic bonds.  Glycogen gives an significant energy

Explain the buccal perforations, Buccal Perforations Buccal concavitie...

Buccal Perforations Buccal concavities in the bone can result in some threads of the implant being exposed. Where these are very circumscribed and covered with thick and well-

Population growth, Increase in population size is known as population growt...

Increase in population size is known as population growth. It depends upon number of persons added to the population and number of persons lost from the population. Addition in pop

The ideas of energy and chemical cycles, How do the ideas of energy and che...

How do the ideas of energy and chemical cycles, community structure, biodiversity and succession fit together to form the basis of the way the natural world works?

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