Adenosine Triphosphatase Activities in Leaves of the Mangrove Avicennia nitida Jacq Influence of Sodium to Potassium Ratios and Salt Concentrations

Adenosine Triphosphatase Activities in Leaves of the Mangrove Avicennia nitida Jacq Influence of... A. Kylin 2 and R. Gee a Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California 92037 Abstract Homogenates from the salt-excreting leaves of the mangrove Avicennia nitida were subjected to differential centrifugation and investigated for adenosine triphosphatase activities. At pH 6.75 a salt stimulation with peaks at three different sodium to potassium ratios could be demonstrated above the activity due to Mg 2+ ions. The stimulation by sodium and potassium depends on the ionic strength of the test medium, higher salt concentrations being inhibitory. The plant system seems thus more complicated than the animal activities. Technically, this means that a search for (Na + + K + )-activated ATPases in plants should be performed with a close spacing of Na:K ratios at several constant levels of salt. Literature data on the transport of Na + and K + indicate that the physiological situation is rather complex in plants. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png

Adenosine Triphosphatase Activities in Leaves of the Mangrove Avicennia nitida Jacq Influence of Sodium to Potassium Ratios and Salt Concentrations

Feb 1, 1970

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Publisher
American Society of Plant Biologist
Copyright
Copyright © 1970 by the American Society of Plant Biologists
ISSN
1532-2548
eISSN
0032-0889
DOI
10.1104/pp.45.2.169
Publisher site
See Article on Publisher Site

Abstract

A. Kylin 2 and R. Gee a Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California 92037 Abstract Homogenates from the salt-excreting leaves of the mangrove Avicennia nitida were subjected to differential centrifugation and investigated for adenosine triphosphatase activities. At pH 6.75 a salt stimulation with peaks at three different sodium to potassium ratios could be demonstrated above the activity due to Mg 2+ ions. The stimulation by sodium and potassium depends on the ionic strength of the test medium, higher salt concentrations being inhibitory. The plant system seems thus more complicated than the animal activities. Technically, this means that a search for (Na + + K + )-activated ATPases in plants should be performed with a close spacing of Na:K ratios at several constant levels of salt. Literature data on the transport of Na + and K + indicate that the physiological situation is rather complex in plants.

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