Cellular totipotency, Biology

Assignment Help:

Cellular Totipotency

The innumerable cells which constitute the body of a higher plant or animal and containing identical genetic material can be traced to a single cell-the zygote. During development cells undergo diverse structural and functional specialisation depending upon their position in the body. Leaf cells bear chloroplasts and act as the site of photosynthesis. The colorless root hairs perform the function of absorbing nutrients and water from the soil and some other cells become part of the colorful petals. Normally fully differentiated cells do not revert back to a meristematic: state, which suggests that the cells have undergone a permanent change. Earlier you know that the regenerative capacity is retained by all living cells of a plant. Several horticultural plants regenerate whole plant from root, leaf and stem cuttings. Highly differentiated and mature cells such as those of pith and cortex and highly specialised cells as those of microspores and endosperm retain full potential to give rise to full plants under suitable culture conditions. G. Haberlandt was the first to test this idea experimentally. This endowment called "cellular Totipotency" is unique to plants. Animal cells possibly because of their higher degree of specialisation do not exhibit Totipotency. Whole plant regeneration from cultured cells may occur in one of the two pathways:

1) Shoot bud differentiation, (organogenesis) and

2) Embryo formation (Embryogenesis).

The Embryos are bipolar structures with no organic connection with the parent tissue and can germinate directly into a complete plant. On the other hand, shoots are monopolar. They need to be removed from the parent tissue and rooted to establish a plantlet. Often the same tissue can be induced to form shoots or embryos by manipulating the components of the culture conditions.


Related Discussions:- Cellular totipotency

Show the process of healing abutment, Q. Show the process of Healing abutme...

Q. Show the process of Healing abutment? Healing abutments are therefore not considered ideal. It is for this reason that the definitive abutment, selected at first stage surge

Explain about congestive cardiac failure, Q. Explain about Congestive Cardi...

Q. Explain about Congestive Cardiac Failure? It is an end stage heart disease and a significant contributor to morbidity and mortality particularly in the elderly population. C

Phylum mollusca, PHYLUM  MOLLUSCA Definition  and Introduction B...

PHYLUM  MOLLUSCA Definition  and Introduction Basically bilateral and protostomial eucoelomate  eumetazoans  whose soft body (L. Millis  or molluscum= soft) is unsegmente

Which of structures is the nuclear membrane composed, Q. which of structure...

Q. which of structures is the nuclear membrane composed? Eukaryotic cells have nucleus delimited with two juxtaposed membranes that continue with the membrane of the endoplasmi

Diseases or genetic abnormalities caused by dominant genes, What are some d...

What are some diseases or genetic abnormalities caused by dominant genes? Why are severe dominant genetic diseases rarer than recessive ones? Instance of dominant genetic disea

Can you define striated cardiac muscle tissue, Q. Of which kind of tissue i...

Q. Of which kind of tissue is the heart made? How is this tissue oxygenated and nutrified? The heart is made of striated cardiac muscle tissue and the heart muscle is called th

Results of cabg , Results of CABG: In most centres where this operation ...

Results of CABG: In most centres where this operation is routinely conducted the mortality is 1-2 per cent. In high-risk group of patients this may go up to 5 to 10 per cent.

Juxtaglomerular apparatus, Normal 0 false false false E...

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Proteins of animal origin - fish, Proteins of Animal Origin - Fish Fish...

Proteins of Animal Origin - Fish Fish: The edible portion is skeletal muscles of the body. Even though the skeletal muscles of different animals are basically similar, fish spe

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