Navigation Links
Transgenic maize is more susceptible to aphids

The environmental consequences of transgenic crops are the focus of numerous investigations, such as the one published in the journal PloS ONE, which was carried out by Cristina Faria and her colleagues, under the supervision of Ted Turlings, professor in chemical ecology at the University of Neuchtel. The researchers observed that most transgenic maize lines were significantly more susceptible to the aphid Rhopalosiphum maidis than their conventional equivalents. "We have studied six lines of Bt maize containing an insecticidal gene derived from the bacteria Bacillus thuringiensis. The toxin produced by these genes is very specific and only affects the caterpillars feeding on the plants, not the aphids. Five of the lines contained up to twice the number of aphids", states Cristina Faria. She does, however, go on to clarify what seems, at a first glance, detrimental to the plant.

"It all depends on the economic threshold for aphids in the region where maize is being grown. If these insects are not a major problem, then it is rather good news." In fact, aphids produce honeydew, a sugar-rich substance that can be used as a food source by beneficial insects, such as the parasitic wasp Cotesia marginiventris. This parasitoid helps the plant when it is attacked by caterpillars. It kills these pests by laying its eggs in them. In cages with aphid-infested Bt maize, Cotesia wasps lived almost twice as long and parasitized 37.5% more caterpillars. Hence, an increase in the number of aphids might help to control caterpillars in areas where these are a major problem. "However, in regions where aphids are considered to be a pest, growing Bt maize could be problematic," adds the biologist. Aphids mainly damage plants by transmitting viruses and using Bt maize might amplify this problem.

So where does this unexpected difference between conventional and Bt maize come from" The insertion of the Bt gene could have an effect on other genes, but the NCCR Plant Survival researchers rather think that by producing Bt toxin the plant's chemistry is otherwise altered. In Bt plants, they measured slightly higher concentrations of amino acids, which are essential nutrients for aphids. Moreover, the plant may mobilise energy resources for the production of the Bt toxin at the cost of producing substances that it normally uses in defence against aphids.

Contact: Igor Chlebny
Public Library of Science

Related biology news :

1. Transgenic plants remove more selenium from polluted soil than wild plants, new tests show
2. Transgenic goats milk offers hope for tackling childrens intestinal disease
3. Single microRNA causes cancer in transgenic mouse
4. Origen publishes in Nature a robust and versatile method for creating transgenic chickens
5. Researcher gets NSF grant to create mutant maize lines
6. Genetically modified maize not found in southern Mexico
7. Kenya halts first field trials of GM maize
8. University of Arizona plant scientists to unravel maize genome
9. Mummys amazing American maize
10. Researchers attach genes to minichromosomes in maize
11. Eat less, weigh more? Enzyme makes lean mice susceptible to dietary fat
Post Your Comments:
(Date:10/8/2015)... Calif. , Oct. 8, 2015 ... of human interface solutions, announced today that it ... of fiscal 2016 on Thursday, October 22, 2015, ... host a corresponding conference call for analysts and ... during which management may discuss forward-looking information.    ...
(Date:10/8/2015)... , October 8, 2015 ... the "Company"), a biometric authentication company focused on ... the Wocket® smart wallet announces that revenues for ... approximately $410,000 compared with $113,00 for the three ... 9 months ended September 30, 2015 were approximately ...
(Date:10/7/2015)... , October 7, 2015 ... company focused on the growing mobile commerce market and ... Stanley E. Washington , former long- term executive at ... Directors. --> NXTD ) ("NXT-ID" or the ... mobile commerce market and creator of the Wocket® smart ...
Breaking Biology News(10 mins):
(Date:10/13/2015)...      Q BioMed Inc (OTC: ... into a strategic relationship with Wombat Capital, Ltd., a ... Paris, France based strategic and scientific advisory ... This collaborative arrangement gives Q BioMed and its stakeholders ... well as long established pharmaceutical industry relationships. The advisors ...
(Date:10/13/2015)... ... October 13, 2015 , ... Exotic ... material handling solutions and components, is opening its latest Parker Store retail location ... facility is Exotic’s second major expansion in Metropolitan Detroit in less than a ...
(Date:10/13/2015)... ... October 13, 2015 , ... The ... school age children in the areas of Science, Technology, Engineering and Mathematics. The ... national economy, and the program aims to increase the number of students who ...
(Date:10/12/2015)... -- MiMedx Group, Inc. (NASDAQ: MDXG ), the leading ... processes to develop and market advanced products and therapies ... Ophthalmic, and the Dental sectors of healthcare, announced today ... the Company has been dismissed by the court.  ... stated, "As we suspected, this case was brought by ...
Breaking Biology Technology: