Abstract
Respiratory gas exchange and incorporation of 14C-leucine into protein were studied in proximal root segments from 25-day-old maize plants grown for the last ten days in 50 mM Na2S04. 14C-leucine incorporation, and oxygen uptake in the presence of glucose, were as large in Na2S04-grown tissues tested under saline conditions as in tissues exposed to non-saline solutions throughout. This adaptation was attributed to an increased metabolic capacity of Na2S04-treated tissues, because these tissues, when returned to non-saline solutions, evolved oxygen and incorporated 14C-leucine faster than tissues exposed continuously to non-saline solutions. These changes are interpreted as a 'compensation' for the inhibitory effects found when non-adapted tissues were exposed to 50 mM Na2S04. Moreover, we have related them to ultrastructural changes observed previously in xylem parenchyma cells of these tissues, and to the possible involvement of these xylem parenchyma cells in the re-absorption of sodium from the ascending xylem fluid.
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