Protecting fresh-cut produce(nd outer leaves of head lettuce with exc...)

Date:5/4/2009

nd outer leaves of head lettuce with excessive moisture at harvest, according to previous research. Furthermore, natural plant reactions to extreme weather conditions, such as excessive moisture, may inhibit the response that harpin is intended to trigger. However, OVQ was higher in the two highest harpin levels than the control.

In Arizona, the two highest harpin levels had lower microbial populations than the control. The middle harpin level also had a higher OVQ than the control. Harpin improved the color and reduced browning in all locations, but decreased with time as lettuce continues to decay even in cold storage.

When treated with the two highest levels of harpin the day before harvest, inner leaves had 25% higher phenolic content. The lowest harpin level made no difference nor did applications 1 week before harvest at any harpin level. All three harpin levels increased phenolic levels 7% to 9% in outer leaves when applied 1 week before harvest. However, only the two highest harpin levels increased phenolic content when applied one day before harvest.

Phenolic compounds have been linked to plant chemical defenses against microbes. There may also be a connection between phenolics and reduced microbial population and improved post-processing quality, as observed in this study. Reduction of oxidation, which causes the browning and decay of cut product, may also be related to an increase of other antioxidants. In addition to phenolics, antioxidants also increased by 40% or more in inner leaves treated with the two highest levels of harpin. The researchers indicated that additional research is needed on this topic.

The study shows potential for harpin use in the future both before and after harvest. Furthermore, the study encourages additional research on harpin and environmental conditions' effects on microbes and visual quality of fresh-cut produce.

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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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