Plant Physiol. Illumina
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

Plant Physiology 50:603-607 (1972)
© 1972 American Society of Plant Biologists

This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in Web of Science
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via CrossRef
Right arrow Citing Articles via Web of Science (22)
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Gerson, D. F.
Right arrow Articles by Poole, R. J.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Gerson, D. F.
Right arrow Articles by Poole, R. J.
Agricola
Right arrow Articles by Gerson, D. F.
Right arrow Articles by Poole, R. J.
Articles

Chloride Accumulation by Mung Bean Root Tips

A Low Affinity Active Transport System at the Plasmalemma 1

Donald F. Gerson2 and Ronald J. Poole

a Department of Biology, McGill University, P. O. Box 6070, Montreal 101, Quebec, Canada

Net uptake of Cl– into root tips of mung bean (Phaseolus aureus) increases steadily with increasing external concentrations from 1 to 60 mM. Membrane potentials were measured to determine the equilibrium concentration of Cl– in the tissue which could be due to diffusion. This concentration was readily exceeded in both the relatively nonvacuolate tips (0 to 1 mm) and the vacuolate, mature upper sectons (1 to 11 mm) of the roots. The activity coefficient of both cytoplasmic and vacuolar Cl–, measured with Cl– sensitive microelectrodes, was approximately the same as that of a pure KCl solution of the same concentration. It is concluded that the "second mechanism" of ion uptake involves a large increase in the rate of active transport at the plasmalemma as the external concentration is increased above 1 mM.

2 Present address: Department of Biophysics, University of Western Ontario, London 72, Ontario, Canada.

1 This work was supported by a grant from the National Research Council of Canada.






HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
ASPB Publications PLANT PHYSIOLOGY® THE PLANT CELL
Copyright © 1972 by the American Society of Plant Biologists