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.