Plant Physiol. Drug Metab Dispos
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Plant Physiology 70:1601-1604 (1982)
© 1982 American Society of Plant Biologists

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Nitrogen Fixation Associated with Rinsed Roots and Rhizomes of the Eelgrass Zostera marina1

Douglas G. Capone and John M. Budin

Marine Sciences Research Center, State University of New York, Stony Brook, New York 11794

Nitrogen fixation was associated with the rinsed roots and rhizomes of the seagrass, Zostera marina L. Nitrogenase activity (acetylene reduction) was greater on rhizomes compared to roots, and on older roots and rhizomes relative to younger tissue. Compared to aerobic assays, anaerobic or microaerobic conditions enhanced the rate of acetylene reduction by rhizomes with attached roots, with the highest activity (100 nanomoles per gram dry weight per hour) occurring at pO2 = 0.01 atmosphere. Addition of glucose, sucrose, or succinate also increased the rate of acetylene reduction under anaerobic conditions, with glucose providing the most stimulation. In one experiment, comparison of acetylene reduction assays with 15N2 incorporation yielded a ratio of about 2.6:1. Seagrass communities are thought to be limited by the availability of nitrogen and, therefore, nitrogenase activity directly associated with their roots and rhizomes suggests the possibility of a N2-fixing flora which may subsidize their nutritional demand for nitrogen.

1 Supported by National Science Foundation Grants OCE-78-25444 and 82-00157 and National Oceanic and Atmospheric Administration Grants NA-80-RAD-00057, NA-79-AAD-00053, and 047158440009. No. 328 of the Marine Sciences Research Center, State University of New York, Stony Brook, NY 11794.




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Copyright © 1982 by the American Society of Plant Biologists