Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Lower Crop Yields Due to Ozone a Factor in World Food Crisis

04.06.2008
Rising background levels of ozone in the atmosphere are a likely contributor to the global food crisis, since ozone has been shown to damage plants and reduce yields of important crop, including soybeans and wheat.

Heat waves, droughts and fuel prices are just a few reasons for the current global food crisis that is making headlines around the world. Research by William Manning of the University of Massachusetts Amherst indicates that rising background levels of ozone in the atmosphere are a likely contributor to the problem, lowering the yield of important food crops, such as wheat and soybeans.

“Plants are much more sensitive to ozone than people, and a slight increase in exposure can have a large impact on their productivity,” says Manning, a professor of plant, soil and insect sciences. “The new ozone standard set by the U.S. EPA in March 2008 is based on protecting human health, and may not be strict enough to protect plants.” Manning served on the Clean Air Science Advisory Committee for the EPA in 1997 when the previous air quality standard for ozone was developed.

According to Manning, emission controls on cars have been successful in reducing short periods of high ozone levels called peaks, but average concentrations of ozone in the atmosphere throughout the year, called the background level, is increasing as polluted air masses from Asia travel to the U. S. and then on to Europe. Background levels are now between 20 and 45 parts per billion in Europe and the United States, and are expected to increase to between 42 and 84 parts per billion by 2100.

Manning was recently part of a team of researchers studying how ozone levels in the Yangtze Delta affect the growth of oilseed rape, a member of the cabbage family that produces one-third of the vegetable oil used in China. By growing the plants in chambers that controlled the ozone environment, the team showed that exposure to elevated ozone reduced the size and weight, or biomass, of the plants by 10 to 20 percent. Production of seeds and oil was also reduced. Results of the study are scheduled for publication in Environmental Pollution.

“What was surprising about this research was that plants exposed to ozone levels that peaked in the late afternoon suffered more damage than plants exposed to a steady ozone concentration throughout the day, even though average ozone concentrations were the same for both groups,” says Manning. “This shows that current ozone standards that rely on average concentrations would underestimate crop losses.”

Additional research in the Yangtze Valley, which accounts for nearly half of China’s crop production, showed that wheat was more sensitive to ozone than rice. “Plants vary widely in their sensitivity to ozone, and varieties of the same species can react differently,” says Manning. “Some of the most sensitive plant species are from the legume and cabbage families, which include radishes, broccoli and soybeans.”

Plants can limit ozone damage for short periods of time by reducing the size of pores on their leaves called stomata. This reduces the uptake of ozone, but also carbon dioxide, which is used as the plants make food through the process of photosynthesis. Chronic exposure results in reduced photosynthesis, plant growth and yields. In the long term, leaf injury occurs when the amount of ozone taken in exceeds the leaf’s capacity to provide antioxidants to counter its effects.

This summer, Manning will be investigating the effects of ozone on a variety of plants in the Pioneer Valley of Massachusetts, where ozone levels are often above the EPA standard as pollution from New York City and Washington, D.C. moves northward during the day. Plants will be grown in open fields, and some will be treated with a compound that blocks the effects of ozone. If the treated plants are healthier than the untreated group, then ozone will be the cause.

William J. Manning | newswise
Further information:
http://www.microbio.umass.edu

More articles from Agricultural and Forestry Science:

nachricht Microjet generator for highly viscous fluids
13.02.2018 | Tokyo University of Agriculture and Technology

nachricht Sweet route to greater yields
08.02.2018 | Rothamsted Research

All articles from Agricultural and Forestry Science >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: In best circles: First integrated circuit from self-assembled polymer

For the first time, a team of researchers at the Max-Planck Institute (MPI) for Polymer Research in Mainz, Germany, has succeeded in making an integrated circuit (IC) from just a monolayer of a semiconducting polymer via a bottom-up, self-assembly approach.

In the self-assembly process, the semiconducting polymer arranges itself into an ordered monolayer in a transistor. The transistors are binary switches used...

Im Focus: Demonstration of a single molecule piezoelectric effect

Breakthrough provides a new concept of the design of molecular motors, sensors and electricity generators at nanoscale

Researchers from the Institute of Organic Chemistry and Biochemistry of the CAS (IOCB Prague), Institute of Physics of the CAS (IP CAS) and Palacký University...

Im Focus: Hybrid optics bring color imaging using ultrathin metalenses into focus

For photographers and scientists, lenses are lifesavers. They reflect and refract light, making possible the imaging systems that drive discovery through the microscope and preserve history through cameras.

But today's glass-based lenses are bulky and resist miniaturization. Next-generation technologies, such as ultrathin cameras or tiny microscopes, require...

Im Focus: Stem cell divisions in the adult brain seen for the first time

Scientists from the University of Zurich have succeeded for the first time in tracking individual stem cells and their neuronal progeny over months within the intact adult brain. This study sheds light on how new neurons are produced throughout life.

The generation of new nerve cells was once thought to taper off at the end of embryonic development. However, recent research has shown that the adult brain...

Im Focus: Interference as a new method for cooling quantum devices

Theoretical physicists propose to use negative interference to control heat flow in quantum devices. Study published in Physical Review Letters

Quantum computer parts are sensitive and need to be cooled to very low temperatures. Their tiny size makes them particularly susceptible to a temperature...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

2nd International Conference on High Temperature Shape Memory Alloys (HTSMAs)

15.02.2018 | Event News

Aachen DC Grid Summit 2018

13.02.2018 | Event News

How Global Climate Policy Can Learn from the Energy Transition

12.02.2018 | Event News

 
Latest News

'Lipid asymmetry' plays key role in activating immune cells

20.02.2018 | Life Sciences

MRI technique differentiates benign breast lesions from malignancies

20.02.2018 | Medical Engineering

Major discovery in controlling quantum states of single atoms

20.02.2018 | Physics and Astronomy

VideoLinks
Science & Research
Overview of more VideoLinks >>>