transgenic plans through plant tissue culture

1. Transgenic Plants through
Plant Tissue Culture

3. Intro....
 Transgenic plants are plants that have been genetically engineered, a
breeding approach that uses recombinant DNA techniques to create plants
with new characteristics
 New trait to the plant which does not occur naturally in the species.
 A transgenic plant contains a gene or genes that have been artificially
inserted.
 Inserted gene sequence is known as the transgene.

4. Agrrobacterium mediated transformation.

5. Cont....
 Purpose of inserting a combination of genes in a plant, is to make it as useful and
productive as possible.
 This process provides advantages like improving shelf life, higher yield, improved
quality, pest resistance, tolerant to heat, cold and drought resistance, against a
variety of biotic and abiotic stresses.
 Tobacco plants were generally used, however potatoes and bananas are also
considere. Tobacco and Arabidopsis thaliana are most genetically modified plants,
due to well developed transformation methods, easy propagation and well studied
genomes.

6. Herbicide resistant plants
 Plants that tolerate herbicides are called Herbicide Resistant Plants. Glyphosate is
an active ingredient of many broad spectrum herbicides. Glyphosate resistant
transgenic tomato, potato, tobacco, cotton etc are developed .
 Insect resistant plants
 Bacillus thuringiensis is a bacterium that is pathogenic for a number of insect
pests. Its lethal effect is mediated by a protein toxin it produces. Through
recombinant DNA methods, the toxin gene can be introduced directly into the
genome of the plant, where it is expressed and provides protection against insect
pests of the plant.

8. Virus resistant plants.
 TMV resistant tobacco and tomato plants are produced by introducing viral coat
proteins. Other viral resistant transgenic plants are (a) virus resistant potato plants
(b) RSV resistant rice, (c) YMV resistant black gram and (d) YMV resistant green
gram.
 Pest resistant plants
 If transgenic plants are developing a resistant into specific pest. e.g Papaya-ring-
spot-virus resistant papaya has been commercialized and grown in Hawaii since
1996.
 Benificial to enviornment and farmers.

14. Uses of Transgenic Plants
 Long-distance transportation. The GM crops are picked, when still green are
allowed to ripen during transportation, therefore yielding a longer shelf life.
 GM seeds will yield a number of benefits, including increased yields and
decreased costs.
 They push GM crops as a second “Green Revolution” in a World, with billions of
hungry mouths to feed.
 It produces a new Variety of Food and Crops that are beneficial for human health.