Abstract
Abstract The role of phenolic content and phenolase activity in the postharvest discoloration of broken snap bean pods (Phaseolus vulgaris L.) was studied by measuring their levels in broken pods which discolored in 24 hours and in broken pods in which discoloration was inhibited by CO2. Elevated CO2 atmospheres (30%) inhibited the increase in phenolics content but did not affect phenolase activity. In addition, phenolic content, peroxidase, and phenolase activities were determined in 2 genotypes which discolor slightly (‘Blue Crop’ and ‘NCX8005’) and two which discolor severely (‘Provider’ and ‘GP72-122’). Again, discoloration was associated with increased levels of phenolic substances after injury regardless of phenolase and peroxidase activities. Systems which inhibit production of phenolics in response to injury reduce the problem of discoloration.
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