Navigation Links
Transgenic maize is more susceptible to aphids
Date:8/29/2007

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
igor.chlebny@unine.ch
41-327-182-507
Public Library of Science
Source:Eurekalert

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:
*Name:
*Comment:
*Email:
(Date:3/28/2017)... 28, 2017 The report "Video ... Monitors, Servers, Storage Devices), Software (Video Analytics, VMS), and ... Global Forecast to 2022", published by MarketsandMarkets, the market ... is projected to reach USD 75.64 Billion by 2022, ... The base year considered for the study is 2016 ...
(Date:3/23/2017)... PUNE, India , March 23, 2017 The report ... Equipment, Touchless Biometric), Industry, and Geography - Global Forecast to 2022", published by ... growing at a CAGR of 29.63% between 2017 and 2022. ... ... Logo ...
(Date:3/22/2017)... LIVERMORE, Calif. , March 21, 2017 ... recognition analytics company serving law enforcement agencies, announced today ... Sheridan as director of public safety business development. ... of diversified law enforcement experience, including a focus on ... Vigilant. In his most recent position, Mr. Sheridan served ...
Breaking Biology News(10 mins):
(Date:7/18/2017)... ... July 18, 2017 , ... Allotrope Foundation won ... first phase of the Allotrope Framework for commercial use. , The Bio-IT World ... “not only elevate the critical role of information technology in modern biomedical research, ...
(Date:7/17/2017)... (PRWEB) , ... July 17, ... ... of technology-enabled clinical trial solutions, today announced safety software company AB Cube ... the eHealth Solutions business segment to advance technology innovation across life sciences ...
(Date:7/17/2017)... ... July 17, 2017 , ... Co-Diagnostics, Inc. (NASDAQ: CODX) ... both to manufacture and sell reagents used for diagnostic tests, has completed its ... in Sandy, Utah, Co-Diagnostics’ intellectual property and technologies are protected by five granted ...
(Date:7/15/2017)... ... July 15, 2017 , ... Cuvette manufacturer ... During this time, the people at FFS have learned that their biggest asset ... at FFS are able to launch new products to meet the changing needs of ...
Breaking Biology Technology: