Abstract
Xylem exudation from detopped tobacco plants (Nicotiana tobacum L. var Virginia Gold) was decreased by 10-2M concentrations of bicarbonate. The bicarbonate anion or its metabolic products were not readily transported to the xylem vessels of detopped plants. In the presence of nitrate ions, which greatly stimulate xylem exudation, bicarbonate did not greatly interfere with nitrate transport. It did decrease xylem exudation in the presence of nitrate because of the added concentration of salt in the external medium without corresponding increase in transport to xylem vessels. In intact plants, K from KHCO3 was readily transported to shoots, however.
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