INFLUENCE OF ROOT TEMPERATURE ON TOMATO GROWTH AND NITROGEN NUTRITION

P. Cornillon
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.

Cornillon, P. (1988). INFLUENCE OF ROOT TEMPERATURE ON TOMATO GROWTH AND NITROGEN NUTRITION. Acta Hortic. 229, 211-218
DOI: 10.17660/ActaHortic.1988.229.20
https://doi.org/10.17660/ActaHortic.1988.229.20

Acta Horticulturae