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The effect of fertilization with nitrate and urea forms of nitrogen on quality and storage ability of lettuce grown in a foil tunnel. III. Phenolic metabolism

Maria Leja, Stanisław Rożek, Jan Myczkowski

Department of Plant Physiology
Faculty of Horticulture, Agricultural University
29 Listopada 54, 31-425 Kraków, Poland

The effect of nitrogen nutrients as nitrate and urea on phenolic metabolism in stored lettuce, cultivated in a foil tunnel, was investigated. A significant accumulation of phenolic compounds, accompanied by increased polyphenoloxidase and peroxidase activity was observed at both storage temperatures (20°C and 5°C). Urea treatment slightly stimulated accumulation of total phenols and chlorogenic acid, especially in the case of cultivar Prado stored at 5°C. The activity of polyphenoloxidase in stored lettuce, fertilized with urea was significantly higher than when treated with nitrate both at low (Oresto and Prado) and high temperature (Oresto). The activity of peroxidase was generally irrespective of the applied form of nitrogen.

Leja M., Rożek S., Myczkowski J., 1995. The effect of fertilization with nitrate and urea forms of nitrogen on quality and storage ability of lettuce grown in a foil tunnel. III. Phenolic metabolism. Folia Horticulturae 7/1: 117-126.