ISHS Acta Horticulturae 229: Symposium on Biological Aspects of Energy Saving in Protected Cultivation
INFLUENCE OF ROOT TEMPERATURE ON TOMATO GROWTH AND NITROGEN NUTRITION |
| Author: | P. Cornillon |
| Abstract:
Young tomato plants were grown in nutrient solution at a constant temperature : 12°C and 22°C. The tomato reacts strongly to the change in root temperature : at 12°C, plant dry weight and water uptake are less than 70 p. cent of that observed at 22°C. The poor growth at 12°C is accompanied by a modification of plant nitrogen nutrition. At 12°C, the organic nitrogen and nitrate accumulate in the root, while at 22°C they accumulate in the stem and the petiole. Concurrently the nitrate reductase activity (NAR) in the roots growing at 12°C is always more important than those growing at 22°C. The NAR is more important in the blades and the difference between treatments are low. But the small growth observed at 12°C induces a reduction of total NAR of blades and emphazizes the further growth restriction. | |
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