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International Journal of Agricultural Research
  Year: 2011 | Volume: 6 | Issue: 5 | Page No.: 400-409
DOI: 10.3923/ijar.2011.400.409
 
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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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How to cite this article:

Benjawan Chutichudet and P. Chutichudet, 2011. Shading Application on Controlling the Activity of Polyphenol Oxidase and Leaf Browning of ‘Grand Rapids’ Lettuce. International Journal of Agricultural Research, 6: 400-409.

DOI: 10.3923/ijar.2011.400.409

URL: https://scialert.net/abstract/?doi=ijar.2011.400.409

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