Transgenic plants

1. Dr. M. PAVUNRAJ, Ph.D.,
Assistant Professor
Post Graduate & Research Department of Zoology
VIVEKANANDA COLLEGE (AUTONOMOUS)
Tiruvedakam West, Madurai – 625 234

5. Why Insect Resistance?
•14% annual losses of potential crop yields is due
to insect pests.
•Increasing the cost-benefit ratio.
•Reducing the environmental pollution.
•Resistant varieties non toxic to man, farm animals
and wild life.

6. [ipt - isopentenyl transferase]
Ti-plasmid of Agrobacterium tumefaciens

14. particular

15. What is BT Cotton?
Genetically Modified Organisms (GMOs)
include crops that are modified by inserting
gene/s from any other organism - plant,
animal or microorganism.
Genetically modified variety of cotton and brinjal that
produces an insecticide.
Marketed by Monsanto, USA.

16. Bt Cotton which claims enhanced resistance to attacks by
bollworms.
This has been done by using a gene of Bacillus
thurengiensis, a soil bacterium, and inserting it into cotton
plant.
Now a similar technique is promoted for Brinjal cultivation
by allowing commercial release of Bt Brinjal on the claims
of resistance to stem and fruit borer Leucinodes orbonalis.

21. Cotton Bollworm, Helicoverpa armigera
Cotton yield loss up to 70% by the larvae

23. Disadvantages
Allergic
Tumorogenicity- ie.capable of causing tumor
High mortality and infertility of off spring
Poor growth
Damage to liver, pancreas, and gut lining
Affects immune system