Abstract
Summary Tomato plants (Lycopersicon esculentum L. cv. Momotaro T96) grown with organic fertilizer possessed higher resistance against phytophthora infection (Phytophthora infestans) in comparison with plants given chemical fertilization. However, the photosynthetic activity was not low in leaves of chemically-fertilized plants before phytoph-thora infection. There were no differences in leaf proteins between the two fertilization treatments, as revealed by electrophoresis. This suggested that high phytophthora infection was not related to physiological activity as indicated by photosynthetic rate and protein profile. Concentrations of leaf nitrogenous compounds, nitrate and amino acids were higher in chemically-fertilized plants. Nitrate concentration in the soil was also higher in chemical plots. On the other hand, leaf nitrate reductase activity and soil hydrogenase activity were lower in chemical plots. The integrated results suggested that nitrogen metabolism in organically-fertilized tomato plants ac...
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