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International Journal of Agricultural Research
Year: 2011  |  Volume: 6  |  Issue: 5  |  Page No.: 400 - 409

Shading Application on Controlling the Activity of Polyphenol Oxidase and Leaf Browning of ‘Grand Rapids’ Lettuce

Benjawan Chutichudet and P. Chutichudet    

Abstract: The effects of preharvest different shading (0, 50, 60, 70 and 80%) on the contents of phenolic and quinone, leaf color, browning appearance and activity of Polyphenol Oxidase (PPO) were evaluated on lettuce cv. Grand Rapids under field conditions. A Completely Randomized Design was arranged with four replications and composed of five treatments: no shading (Control) compared with shading sunlight to 50, 60, 70 or 80% when the plants aged 15 Days After Planting (DAP). The results showed that plants grown under shading of 60% sunlight had the lowest contents of both phenolic and quinone substances. In addition, leaf color from plants treated with 60% shading showed the lowest a* value. Furthermore, at harvest, both the least browning damage and the minimal activity of PPO were achieved with the treatment of 60% reduction of sunlight.

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