Navigation Links
Ozone masks plants volatiles, plant eating insects confused
Date:4/2/2013

Increases in ground-level ozone, especially in rural areas, may interfere not only with predator insects finding host plants, but also with pollinators finding flowers, according to researchers from Penn State and the University of Virginia.

"Ozone pollution has great potential to perniciously alter key interactions between plants and animals," the researchers said in a recent issue of Environmental Research Letters.

The animal tested in this case was the striped cucumber beetle, a predator of cucurbits -- cucumber, squash, pumpkin and melons. These insects dine on the plants from the moment they emerge from the ground and when fruit forms, they eat that as well.

"Insects detect odor with olfactory receptors located on their antennae," said Jose D. Fuentes, professor of meteorology, Penn State. "These receptors sense plant-emitted volatile organic compounds in very small amounts -- as low as six molecules hitting an antenna."

However, ozone, which is a very reactive substance, degrades the volatile organic compounds when they mix to the point where they no longer stimulate the olfactory system.

Fuentes, working with John Zenker, Penn State undergraduate in meteorology, and T'ai H. Roulston, research associate professor and curator, Blandy Experimental Farm, University of Virginia, tested the beetles in an enclosed Y-tube apparatus so that the insect could choose which branch to take. Researchers collected the insects from pumpkin and squash plants. They tested the insects using buffalo gourd plants, a naturally growing wild gourd that likes semiarid areas.

Separate air streams flowed into the two branches of the Y-tube. Choices of air in each tube were ambient filtered air, ambient filtered air plus up to 120 parts per million ozone, ambient filtered air plus volatile organic compounds, or air plus up to 120 parts per billion ozone and volatile organic compounds from the plant. To obtain this mix, or only ozone or volatile organic compounds, that branch flowed either to a plant chamber or ozone generator or both.

The researchers tested the insects with all ambient air, with ambient air and ozone, with ambient air and volatile organic compounds, and with ambient air and a mix of ozone and volatile organic compounds. When presented with an ambient air or volatile organic compound airstream, the beetles chose the volatile organic compound tube 80 percent of the time.

"However, as the ozone levels increased, they chose the path to the flower less frequently," said Fuentes. "By the time the mix contained 80 parts per billion ozone, the beetles showed no preference for either tube."

The researchers also tested the beetles with volatile organic compounds and a mix of volatile organic compounds and ozone. At low ozone levels, the insects showed no preference, but as ozone levels increased, the insects increasingly preferred the ozone-free path. At 80 parts per billion, the beetles chose the volatile organic compounds without ozone significantly more often than the ozonized mixture.

While one might think that higher ozone levels in the lower atmosphere would improve crops because predator insects would be unable to find their hosts, the additional ozone would also interfere with mutualistic insect plant responses such as pollination.


'/>"/>

Contact: A'ndrea Elyse Messer
aem1@psu.edu
814-865-9481
Penn State
Source:Eurekalert

Related biology news :

1. NASA pinpoints causes of 2011 Arctic ozone hole
2. Ground-level ozone falling faster than model predicted
3. 2 climate scientists win 2012 Vetlesen Prize for work on ozone hole, ice cores
4. Ozone levels have sizeable impact on worker productivity
5. University of Illinois receives grant to study ozone resistance in corn
6. Ozones impact on soybean yield: Reducing future losses
7. Houston Clean Air Network offering real-time online ozone report
8. Ozone treated water v. lethal microbial material
9. New scientific method unmasks chronic infections
10. Researchers find novel way plants pass traits to next generation
11. Epigenetics studies take root in plants
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:11/15/2016)... Research and Markets has announced the addition of the ... offering. ... The global bioinformatics market is ... Billion in 2016, growing at a CAGR of 21.1% during the ... driven by the growing demand for nucleic acid and protein sequencing, ...
(Date:6/22/2016)... June 22, 2016   Acuant , ... verification solutions, has partnered with RightCrowd ® ... for Visitor Management, Self-Service Kiosks and Continuous ... that add functional enhancements to existing physical ... and venues with an automated ID verification ...
(Date:6/15/2016)... New York , June 15, 2016 /PRNewswire/ ... a new market report titled "Gesture Recognition Market by ... and Forecast, 2016 - 2024". According to the report, ... USD 11.60 billion in 2015 and is estimated ... reach USD 48.56 billion by 2024.  ...
Breaking Biology News(10 mins):
(Date:12/2/2016)... Boston, MA (PRWEB) , ... December 02, 2016 , ... ... of Light Event on December 3rd, 2016. The event, which is held on ... NTI’s work with helping Americans with Disabilities back into the workplace. Suitable Technologies is ...
(Date:12/2/2016)... The immunohistochemistry (IHC) market is projected to reach ... during the forecast period of 2016 to 2021 dominated by immunohistochemistry ... the largest share of immunohistochemistry (IHC) market, by end user.   ... , , ... across 225 pages, profiling 10 companies and supported with 181 tables ...
(Date:11/30/2016)... , ... November 30, 2016 , ... ... moving magnet Voice Coil Actuator with a flexure design that ensures high alignment ... with cost-effective pricing and is ideally suited where extreme precision is required, such ...
(Date:11/30/2016)... New York , November 30, 2016 ... consolidated as a few players hold a dominant share ... Group, Charles River Laboratories International, Inc., and Merck KGaA, ... market in 2015. Transparency Market Research observes that these ... are focused on development products that are do not ...
Breaking Biology Technology: