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Growing of greenhouse tomato from seedlings at different stages of development at various temperatures of the air and nutrient solution. II. Leaf size and content of photosynthetic pigments

S. Rożek*, W. Sady**, J. Myczkowski*

**Department of Plant Physiology
**Institute of Vegetables and Ornamental Plants
**Faculty of Horticulture, Agricultural University
**29 Listopada 54, 31-425 Kraków, Poland

The results obtained show that tomato plants grown at a higher night temperature of the air were characterized by the largest leaf blades. The temperature of the nutrient solution or the developmental stage of seedlings at the time they were planted in growing channels had no significant effect on the size of leaves. Tha smallest leaf blades were found in plants grown in a system combining a lower night temperature of the air (11°C) and unheated nutrient solution. A great difference, reaching over 300 cm2 per 1 leaf, was found between the size of leaf blades of tomatoes grown in the above conditions and those grown at a higher air temperature (17°C) and nutrient solution (20°C). An interaction occurred between the conditions of growth and the date of transplanting the tomatoes to growing channels, in the aspect of formation of leaf size. Changing temperatures of the air and nutrient solution affected the content of photosynthetic pigments in tomato leaves to a decidedly smaller degree than their size. The results suggested that the differences found in the content of chlorophylls ‘a’ and ‘b’ and of carotenoids were much more associated with the date of transplanting the tomatoes to growing channels. No disturbances of natural quantitative proportions between chlorophylls ‘a’ and ‘b’ were observed.

Rożek S., Sady W., Myczkowski J., 1991. Growing of greenhouse tomato from seedlings at different stages of development at various temperatures of the air and nutrient solution. II. Leaf size and content of photosynthetic pigments. Folia Horticulturae III/3: 81-95.