Navigation Links
Insecticides from genetically modified corn present in adjacent streams

In a paper published this week in the Proceedings of the National Academy of Sciences, Cary Institute aquatic ecologist Dr. Emma Rosi-Marshall and colleagues report that streams throughout the Midwestern Corn Belt are receiving insecticidal proteins that originate from adjacent genetically modified crops. The protein enters streams through runoff and when corn leaves, stalks, and plant parts are washed into stream channels.

Genetically-modified plants are a mainstay of large-scale agriculture in the American Midwest, where corn is a dominant crop. In 2009, more than 85% of U.S. corn crops were genetically modified to repel pests and/or resist herbicide exposure. Corn engineered to release an insecticide that wards off the European corn borer, commonly referred to as Bt corn, comprised 63% of crops. The tissue of these plants has been modified to express insecticidal proteins, one of which is commonly known as Cry1Ab.

Following an assessment of 217 stream sites in Indiana, the paper's authors found dissolved Cry1Ab proteins from Bt corn present in stream water at nearly a quarter of the sites, including headwater streams. Eighty-six percent of the sampled sites contained corn leaves, husks, stalks, or cobs in their channels; at 13% of these sites corn byproducts contained detectable Cry1Ab proteins. The study was conducted six months after crop harvest, indicating that the insecticidal proteins in crop byproducts can persist in the landscape.

Using these data, U.S. Department of Agriculture land cover data, and GIS modeling, the authors found that all of the stream sites with detectable Cry1Ab insecticidal proteins were located within 500 meters of a corn field. Furthermore, given current agricultural land use patterns, 91% percent of the streams and rivers throughout Iowa, Illinois, and Indiana some 159,000 miles of waterwaysare also located within 500 meters of corn fields.

Rosi-Marshall comments, "Our research adds to the growing body of evidence that corn crop byproducts can be dispersed throughout a stream network, and that the compounds associated with genetically-modified crops, such as insecticidal proteins, can enter nearby water bodies."

After corn crops are harvested, a common agricultural practice is to leave discarded plant material on the fields. This "no-till" form of agriculture minimizes soil erosion, but it also sets the stage for corn byproducts to enter nearby stream channels.

Rosi-Marshall concludes, "The tight linkage between corn fields and streams warrants further research into how corn byproducts, including Cr1Ab insecticidal proteins, potentially impact non-target ecosystems, such as streams and wetlands." These corn byproducts may alter the health of freshwaters. Ultimately, streams that originate in the Corn Belt drain into the Mississippi River and the Great Lakes.


Contact: Lori M. Quillen
845-677-7600 x233
Cary Institute of Ecosystem Studies

Related biology news :

1. NIH funds development of resistance-breaking insecticides to reduce malaria transmission
2. Manatee subspecies genetically confirmed, but diversity challenge looms
3. Scientists find new evidence of genetically modified plants in the wild
4. Scientists find the first evidence of genetically modified plants in the wild
5. Woods noble rot fungus genetically decoded
6. Genetically reprogrammed HSV given systemically shrinks distant sarcomas
7. Genetically modified cell procedure may prove useful in treating kidney failure
8. UT Southwestern researchers use novel sperm stem-cell technique to produce genetically modified rats
9. Genetically engineered crops benefit many farmers, but the technology needs proper management to remain effective
10. Genetically engineered tobacco plant cleans up environmental toxin
11. Genetically-modified mice reveal another mechanism contributing to heart failure
Post Your Comments:
Related Image:
Insecticides from genetically modified corn present in adjacent streams
(Date:11/16/2015)... 2015  Synaptics Inc. (NASDAQ: SYNA ), ... announced expansion of its TDDI product portfolio with ... and display driver integration (TDDI) solutions designed to ... TDDI products add to the previously-announced TD4300 ... resolution), and TD4322 (FHD resolution) solutions. All four ...
(Date:11/10/2015)... 10, 2015  In this report, the ... of product, type, application, disease indication, and ... report are consumables, services, software. The type ... biomarkers, efficacy biomarkers, and validation biomarkers. The ... diagnostics development, drug discovery and development, personalized ...
(Date:11/2/2015)... Nov. 2, 2015  SRI International has been awarded ... preclinical development services to the National Cancer Institute (NCI) ... provide scientific expertise, modern testing and support facilities, and ... pharmacology and toxicology studies to evaluate potential cancer prevention ... The PREVENT Cancer Drug Development Program is an NCI-supported ...
Breaking Biology News(10 mins):
(Date:11/27/2015)... PUNE, India , November 27, 2015 ... --> Growing popularity of companion ... emerging in cancer biomarkers market with pharmaceutical ... develop in-demand companion diagnostic tests. ... --> Complete report on global ...
(Date:11/26/2015)... , November 26, 2015 --> ... company specializing in imaging technologies, announced today that it has ... part of the Horizon 2020 European Union Framework Programme for ... large-scale clinical trial in breast cancer. , ... --> --> The study ...
(Date:11/25/2015)... Nov. 25, 2015  PharmAthene, Inc. (NYSE MKT: PIP) ... a stockholder rights plan (Rights Plan) in an effort ... carryforwards (NOLs) under Section 382 of the Internal Revenue ... PharmAthene,s use of its NOLs could be substantially ... defined in Section 382 of the Code. In general, ...
(Date:11/25/2015)... Studies reveal the differences in species of bacteria ... for more effective treatment for one of the most commonly ... --> --> Gum disease is one ... relatively little was understood about the bacteria associated with it ... researchers from the WALTHAM Centre for Pet Nutrition together with ...
Breaking Biology Technology: