SummaryMeasurements are described of the uptake of sodium and potassium by barley roots at low salt status. It was found that initially there was little preference for potassium in the salt accumulated, but about 5 hr after the start of salt accumula· tion net uptake of sodium decreased markedly, and thereafter much more potassium was taken up than sodium. The roots reached salt saturation in about 24 hr. The decreased sodium uptake was due to a reduction in sodium influx.It is suggested that this change in selectivity is due to an increased ratio of potassium to sodium in the cytoplasm, which altered the proportions of potassium and sodium taken up into the vacuole.This change in the relative sizes of sodium and potassium influxes during salt accumulation by the roots is parallel to a similar change in the proportion of sodium and potassium transported to the shoots of barley seedlings. It is suggested that both transport to the shoot and accumulation in the root cells are controlled by the selective uptake of ions to the cytoplasm of barley root cells.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.