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:1/12/2017)... NEW YORK , Jan. 12, 2017  New research ... around the office of the future.  1,000 participants were simply ... last three months which we may consider standard issue.  Insights ... office of 2017 were also gathered from futurists and industry ... and Dr. James Canton .  Some ...
(Date:1/11/2017)... 11, 2017  Michael Johnson, co-founder of Visikol Inc. a company ... has been named to the elite "Forbes 30 Under 30" list ... 600 people in 20 fields nationwide to be recognized as a ... applicants were selected. ... He is currently a PhD candidate at Rutgers University. ...
(Date:1/6/2017)...  Delta ID Inc., a leader in consumer-grade iris ... at CESĀ® 2017. Delta ID has collaborated with Gentex ... use of iris scanning as a secure, reliable and ... a car, and as a way to elevate the ... Delta ID and Gentex will demonstrate (booth #7326 LVCC) ...
Breaking Biology News(10 mins):
(Date:1/20/2017)... , January 20, 2017 Stock-Callers.com ... conditions have influenced the most recent performances of select ... (NASDAQ: RGLS ), Abeona Therapeutics Inc. (NASDAQ: ... TBPH ), and Sage Therapeutics Inc. (NASDAQ: ... by Grand View Research, global Biotech market size is expected to ...
(Date:1/19/2017)... 19, 2017  Market Research Future has a half cooked research ... Biopsy is growing rapidly and expected to reach USD 450 Million ... ... Biopsy Market has been assessed as a swiftly growing market and ... in the coming future. There has been a tremendous growth in ...
(Date:1/19/2017)... ... January 19, 2017 , ... November ... to leading biopharmaceutical and medical device manufacturers and regulators, is proud to announce ... Part 11-compliant email client designed to provide product vigilance departments with the flexibility ...
(Date:1/19/2017)... ... January 18, 2017 , ... LabRoots , the leading ... the world, was today awarded the "Best Science & Technology Social Networking Service ... and decided upon by a dedicated team of researchers and analysts. , The ...
Breaking Biology Technology: