ISHS Acta Horticulturae 534: International Conference and British-Israeli Workshop on Greenhouse Techniques towards the 3rd Millennium
SULPHATE UPTAKE AND TRANSLOCATION IN TOMATO SEEDLINGS IN RESPONSE TO SULPHATE LEVEL IN THE NUTRIENT SOLUTION |
| Authors: | J. Lopez, N. Tremblay, A. Gosselin, C.I. Bell, M. Dorais, H. Zekki |
| Keywords: | Lycopersicon esculentum, radio tracer, mineral nutrition and translocation, nutrient solution, fluxes |
| Abstract:
This study investigated uptake and translocation of sulphate in intact tomato seedlings cv 'Solairo'. The 35S fractions were measured in different plant parts over a 24 hours period. At deficient and excessive sulphate levels, the instantaneous sulphate uptake (OC) in tomato seedlings was strongly influenced by the sulphate concentration in the rhizosphere. The transport of sulphate from root to shoot (cx) was almost the same in seedlings incubated at both 20.8 mM sulphate and 10.4 mM sulphate. Young tomato plants can regulate sulphate influx from the cytoplasm to the xylem and the net uptake. The highest influx of SO4-2 from the external solution to the cytoplasm (Oc) and the highest efflux (Oc) was observed at the highest sulphate concentrations (20.8 mM), indicating extensive recycling at the plasma membrane. We therefore established that a sulphate concentration of 10.4 mM in greenhouse tomato nutrient solution allows an optimum uptake. | |
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