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Computerized tool takes a bite out of traditional apple testing
Date:12/13/2011

WENATCHEE, WAWhen it comes to apples, consumers like a crisp bite. Apple breeders know that crispness is one of the most important "sensory attributes" in apples. Because new apple varieties must be tested for these attribute before being introduced to consumers, breeders are constantly searching for methods to accurately measure traits like taste and crispness. Most breeders test the "old-fashioned" wayusing panels of experts who taste-test each fruit. This method, called sensory analysis, can have a downside; panel members can become fatigued and less accurate when scoring multiple varieties.

Testing for crispness using instruments instead of people is notoriously difficult for apple breeding programs. Currently, programs use either a fruit penetrometera tool used to measure a fruit's hardnessor a non-destructive method such as acoustic resonance technology. Although data acquired using these methods correlates well with attributes such as firmness, hardness, or fruit maturity, the methods are not good indicators of crispness. Therefore, most breeders still rely on human panels for testing apple crispness.

In an attempt to find an alternate method that could be practicable for screening large numbers of apples for crispness, researchers from the Tree Fruit Research and Extension Center at the Washington State University tested a new computerized penetrometer to assess firmness and texture of apples from the Washington State University's apple breeding program and 16 standard apple varieties. They then compared the instrumental data with sensory data from an expert panel. The research, published in HortTechnology, will be useful for apple breeders looking for ways to reduce errors and give apple-weary human testers a rest.

"The computerized penetrometer, the Mohr Digi-Test (MDT-1), is a new tool for measuring firmness and potentially crispness", explained corresponding author Kate Evans. "In addition to the expected high
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Contact: Michael W. Neff
mwneff@ashs.org
703-836-4606
American Society for Horticultural Science
Source:Eurekalert  

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