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Plant Physiology 45:169-172 (1970)
© 1970 American Society of Plant Biologists

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Adenosine Triphosphatase Activities in Leaves of the Mangrove Avicennia nitida Jacq

Influence of Sodium to Potassium Ratios and Salt Concentrations 1

A. Kylin2 and R. Gee

a Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California 92037

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 Mg2+ 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.

2 Permanent address: Institute of Botany, University of Stockholm, Lilla Frescati, S-104 05 Stockholm, Sweden.

1 Supported by United States Public Health Service Grants GM-12310 and AM 12386-03. Traveling expenses for Dr. Kylin were provided by a Fulbright Scholarship of the United States Government, by the Hahn Scholarship of the Royal Swedish Academy of Sciences, and by a Scholarship from the Wallenberg Foundation 50th Anniversary Donation to the University of Stockholm.






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