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GSU professor develops new method to help keep fruit, vegetables and flowers fresh
Date:10/20/2009

ATLANTA Did you know that millions of tons of fruits and vegetables in the United States end up in the trash can before being eaten, according to the U.S. Department of Agriculture?

A Georgia State University professor has developed an innovative new way to keep produce and flowers fresh for longer periods of time. Microbiologist George Pierce's method uses a naturally occurring microorganism no larger than the width of a human hair to induce enzymes that extend the ripening time of fruits and vegetables, and keeps the blooms of flowers fresh. The process does not involve genetic engineering or pathogens, but involves microorganisms known to be associated with plants, and are considered to be helpful and beneficial to them.

"These beneficial soil microorganisms serve essentially the same function as eating yogurt as a probiotic to have beneficial organisms living in the gastrointestinal system," Pierce said.

The process works by manipulating the organism's diet so that it will over express certain enzymes and activities that work in the ripening process and keeping the flower blooms fresh. Pierce analogizes this to using diet and exercise to improve the performance of an athlete.

"We change the diet of the organism, and we can change its performance," Pierce said. "It's no different than taking a good athlete and putting them on a diet and exercise regime, and turning him or her into a world-class athlete."

In a very simple sense, climacteric plants such as apples, bananas, peaches and tomatoes respond to climactic change, and when they do, they produce increased levels of signal compounds like ethylene. For fruit such as peaches, ethylene causes the peach to ripen, increases aroma chemicals, but unfortunately, makes the peach very fragile.

"If you've seen ripe peaches, they will simply fall apart," Pierce said. "It will lose 90 percent of its ability to resist pressure, which means that if a peach r
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Contact: Jeremy Craig
jcraig@gsu.edu
404-413-1357
Georgia State University
Source:Eurekalert

Page: 1 2

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