Effects of External Potassium Supply on Compartmentation and Flux Characteristics of Radiocaesium in Intact Spring Wheat Roots |
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| Authors: | ZHU Y-G; SHAW G; NISBET A F; WILKINS B T |
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| Institution: | T. H. Huxley School of Environment, Earth Science and Engineering, Imperial College of Science Technology and Medicine, Silwood Park, Ascot, SL5 7TE, UK National Radiological Protection Board, Chilton, Didcot, Oxon, OX11 ORQ, UK |
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| Abstract: | Short term experiments investigated the effects of potassiumsupply on radiocaesium influx/efflux and the radiocaesium compartmentationin intact spring wheat roots. Short term (24–72 h) influxanalysis showed that net influxes of radiocaesium to both rootand xylem were reduced approximately ten-times by increasingexternal potassium concentration from 50 µM to 200 µM.Efflux analysis distinguished three components for radiocaesium(namely cell wall+free space, cytoplasm and vacuole) and showedthat the rates of Cs+efflux at an external potassium concentrationof 100 µM (19.16 and 1.70 Bq g-1min-1for |
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