Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Plant Physiology 64:791-795 (1979)
© 1979 American Society of Plant Biologists

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Articles

Azolla-Anabaena Relationship

VIII. Photosynthetic Characterization of the Association and Individual Partners 1,2

Thomas B. Ray3, Berger C. Mayne, Robert E. Toia, Jr. and Gerald A. Peters4

a Charles F. Kettering Research Laboratory, 150 East South College Street, Yellow Springs, Ohio 45387

Photosynthesis in the Azolla-Anabaena association was characterized with respect to photorespiration, early products of photosynthesis, and action spectra. Photorespiration as evidenced by an O2 inhibition of photosynthesis and an O2-dependent CO2 compensation concentration was found to occur in the association, and endophyte-free fronds, but not in the endophytic Anabaena. Analysis of the early products of photosynthesis indicated that both the fern and cyanobacterium fix CO2 via the Calvin cycle. The isolated endophytic Anabaena did not release significant amounts of amino acids synthesized from recently fixed carbon. The action spectra for photosynthesis in the Azolla-Anabaena association indicated that the maximum quantum yield is between 650 and 670 nanometers, while in the endophyte the maximum is between 580 and 640 nanometers. Although the endophytic cyanobacterium is photosynthetically competent, any contribution it makes to photosynthesis in the intact association was not apparent in the action spectrum.

3 Current address: Central Research and Development Department, E. I. du Pont de Nemours and Co., Inc., Wilmington, Delaware 19898.

4 To whom reprint requests should be sent.

1 Supported in part by National Science Foundation Grant DEB 74-11679A01.

2 Contribution No. 664 from the C. F. Kettering Research Laboratory.




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