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Annals of Botany 72: 223-230, 1993
© 1993 Annals of Botany Company
Control of Net Uptake of Nutrients by Regulation of Influx in Barley Plants Recovering from Nutrient Deficiency
AFRC Institute of Arable Crops Research, University of Bristol, Long Ashton Research Station, Bristol BS18 9AF, UK
Rates of influx and net uptake of nitrate, phosphate and sulphate were measured in intact barley plants, and concurrent efflux was obtained by difference. Net uptake of these anions varied widely depending on the nutrient status of the plants, and the differences in net uptake could be accounted for almost entirely by changes in influx. Efflux played only a minor role in regulating net uptake of nitrate, phosphate or sulphate during recovery from N-, P-, or S-deficiency.
Nitrate influx and short-term ammonium absorption by N-deficient barley plants were closely correlated, and varied in parallel with rates of net uptake of nitrate or ammonium by similar plants. Again, it would seem that net uptake of ammonium is controlled predominantly by changes in the rate of influx.Copyright 1993, 1999 Academic Press
Hordeum vulgare, barley, nutrient absorption, influx, nitrate, phosphate, sulphate, ammonium
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