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

Signs and symptoms of emphysema, Pathophysiology Distension and damage...

Pathophysiology Distension and damage of the respiratory bronchioles selectively occur. Opening develops in the walls of the bronchioles. and they become enlarged and conf

Define end and the beginning of the first interphase period, Q. What are th...

Q. What are the events that mark the end and the beginning of the first interphase period? What happens inside the cell in this period? The initial interphase period is the G1.

How many are the pulmonary veins, Q. What and how many are the pulmonary ve...

Q. What and how many are the pulmonary veins? The pulmonary veins are part of the pulmonary circulation they are vessels that carry oxygen-rich (arterial) blood from the lungs

Kiva, briefly explain pinocytosis

briefly explain pinocytosis

Define the concept of health - public nutrition, Define the Concept of Heal...

Define the Concept of Health - Public Nutrition? The most widely accepted definition of health is the one given by WHO (1948) in the preamble to its constitution, Box 1 gives t

Name the common nitrogen-fixer in paddy field, The common nitrogen-fixer in...

The common nitrogen-fixer in paddy fields is: 1. Rhizobium 2. Azospirillum 3. Oscillatoria 4. Frankia Azospirillum is the common nitrogen-fixer in paddy fields

Cutin, CUTIN It is a lipid formed by polymerization and cross-esterific...

CUTIN It is a lipid formed by polymerization and cross-esterification of hydroxy fatty acids. Cutin occurs inside outer epidermal walls of plant surfaces as bringing agent t

Materials handling and storage, Materials Handling and Storage Materi...

Materials Handling and Storage Material handling is a very significant process in working place. The materials are handled in not finished, semi finished and finished states.

How dietary iron is absorbed in my blood vessels, What pathway does dietary...

What pathway does dietary iron follow in blood vessels

Embryo-sac, Embryo-sac : Embryo-sac is formed from megaspore mother cel...

Embryo-sac : Embryo-sac is formed from megaspore mother cell. In embro-sac, there are 7 cells arranged in 3 groups. The 7 cells are one egg (female gamete), 2 synergids,

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