insectresistancetrasgenicplants-211224100742 2.pdf

Insect resistance

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%annuallossesofpotentialcropyieldsisdue
toinsectpests.
•Increasingthecost-benefitratio.
•Reducingtheenvironmentalpollution.
•Resistantvarietiesnontoxictoman,farmanimals
andwildlife.

6. [ipt -isopentenyl transferase]
Ti-plasmid ofAgrobacterium tumefaciens

14. particular

15. What is BT Cotton?
GeneticallyModifiedOrganisms (GMOs)
includecropsthataremodifiedbyinserting
gene/sfromanyotherorganism-plant,
animalormicroorganism.
Geneticallymodifiedvarietyofcottonandbrinjalthat
producesaninsecticide.
MarketedbyMonsanto,USA.

16. BtCottonwhichclaimsenhancedresistancetoattacksby
bollworms.
ThishasbeendonebyusingageneofBacillus
thurengiensis,asoilbacterium,andinsertingitintocotton
plant.
NowasimilartechniqueispromotedforBrinjalcultivation
byallowingcommercialreleaseofBtBrinjalontheclaims
ofresistancetostemandfruitborerLeucinodesorbonalis.

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

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