Folia Horticulturae

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The effect of fertilization with different forms of nitrogen on greenhouse lettuce quality and its changes during storage. 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 nutritives applied as nitrate, ammonium, and urea on phenolic metabolism in stored greenhouse lettuce was investigated. A significant increase in total phenolics was observed during storage of lettuce, particularly at 20°C, as well as a slight increase in chlorogenic acid content, caused by short-term storage at 5°C. Reduced forms of nitrogen stimulated total phenolics accumulation in lettuce stored at 20°C (ammonium and urea) and 5°C (ammonium), as well as chlorogenic acid content.

A considerable increase of polyphenoloxidase and peroxidase activity was found during storage of lettuce, irrespectively of storage temperature. Reduced forms of nitrogen induced PPO and POD activity in lettuce leaves, stored at high (20°C) and at low (5°C) temperature.

Leja M., Rożek S., Myczkowski J., 1994. The effect of fertilization with different forms of nitrogen on greenhouse lettuce quality and its changes during storage. III. Phenolic metabolism. Folia Horticulturae VI/1: 63-72.