Tritrophic Study Shows Effects of Bt Cotton on Herbivore and Its PredatorJune 4, 2014
Scientist Rishi Kumar and colleagues conducted a tritrophic study to investigate the transfer of Cry proteins from Bt cotton to herbivore onion thrips (Thrips tabaci) and its predator insidious flower bug (Orius insidiosus). They also aimed to know the effects of the proteins on the predator's development, survival, and reproduction.
The average protein titers in Bt cotton leaves were 1,256 and 43,637 ng Cry1Ac and Cry2Ab per gram fresh leaf tissue, respectively. At the second trophic level, larvae of onion thrips reared on Bt cotton for 2 to 4 days had 22.1 and 2.1 percent of the Cry1Ac and Cry2Ab levels expressed in leaves, respectively. At the third trophic level, insidious flower bugs that fed on onion thrips larvae had 4.4 and 0.3% of the Cry1Ac and Cry2Ab protein levels, respectively, expressed in Bt plants.
Results showed that insidious flower bug's survivorship, time of nymphal development, adult weight, preoviposition and postoviposition periods, fecundity, and adult longevity were not significantly affected by Bt proteins. These results indicate that the insidious flower bug is not harmed by Bt cotton when exposed to Bt proteins through its prey. Thus, the insidious flower bug can continue to provide important biological control services in the cotton ecosystem when Bt cotton is used to control primary lepidopteran pests.
Read the research article at http://www.ingentaconnect.com/content/esa/jee/2014/00000107/00000003/art00006
The Crop Biotech Update is a weekly newsletter of ISAAA, a non-for-profit organization. The CBU is distributed for free to over 23,000 subscribers worldwide to inform them about the key developments in biosciences, especially in agricultural biotechnology. Your support will help us in our mission to feed the world with knowledge. You can help by donating as little as $10.
See more articles:
News from Around the World
- 3,000 Rice Genome Sequences Made Publicly Available on World Hunger Day
- Egypt Minister of Agriculture and Land Reclamation: Agri-biotech to Benefit Country
- Rwanda Adopts Green Growth Strategy
- Farmer Leader Calls for Bt Cotton Trials in Zimbabwe
- Survey Shows Growing Opposition to GM Food Labeling
- Researchers Discover Rice Blast Match
- Policy Roundtable Discussion and Media Workshop Tackle Biotech in Southeast Asia
- Team from Australia Develops Drought Tolerant Mungbean
- Pakistan to Intensify Cotton Seed Yield
- Asian Biotech Body Gets New Committee
- Genetic Mechanism Protects Plants from Zinc
- Recombinant Barley-produced Antibody for Bovine Milk Allergen Detection
- Tritrophic Study Shows Effects of Bt Cotton on Herbivore and Its Predator
- Late Blight Resistant Potato Developed Using Cisgenesis Approach
- Transgenic Sugarcane Can Grow in Potassium Scarce Conditions
Beyond Crop Biotech
- Island Plants Evolve to Have Larger Seeds
- Crude-oil Degrading Bacteria Isolated in Persian Gulf
- IPBO Announces Postgraduate Course Biosafety in Plant Biotechnology
- Molecular Biology for Non-Biologists Course
- ISAAA Releases Infographic on Biotech Crops Benefits
Subscribe to CBU: