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Annals of Botany 80: 499-503, 1997
© 1997 Annals of Botany Company

Cyclic AMP in Rhizobia and Symbiotic Nodules

J. TERAKADO, M. OKAMURA, S. FUJIHARA, M. OHMORI and T. YONEYAMA,

Graduate Course of Environmental Studies, University of Tsukuba, Tsukuba, Ibaraki, 305, Japan Institute of Applied Biochemistry, University of Tsukuba, Tsukuba, Ibaraki, 305, Japan Shikoku National Agricultural Experiment Station, Zentsuji, Kagawa, 765, Japan Department of Biology, University of Tokyo, Meguro-ku, Tokyo, 153, Japan Plant Nutrition Diagnosis Laboratory, National Agriculture Research Center (NARC), Tsukuba, Ibaraki, 305, Japan

Received February 18, 1997 ; Accepted June 10, 1997 .

Cyclic adenosine 3',5'-monophosphate (cAMP) content of various cultured rhizobia strains and tissues of legumes and non-leguminous plants was measured by enzyme immunoassays. Most rhizobia, cultured for 44 to 165 h, contained cAMP ranging from 0.6 to 5 pmol mg-1protein except forAzorhizobium caulinodansORS571. The culture media also contained varying amounts of cAMP depending on the strain of rhizobia.Azorhizobiumcells and their media contained no detectable cAMP. Nodules from most legumes and non-legumes had cAMP contents ranging from 2–70 pmol g-1f.wt. However, nodules fromSesbania rostrata,Crotalaria spectabilisandParasponia andersoniishowed undetectable cAMP levels, and those fromGlycine maxandVigna angularisoccasionally showed levels below the detection limit. The leaves of non-legumes mostly had cAMP levels below detection limit (approx. 1.0 pmol g-1 f.wt), while the leaves of a few legumes occasionally had detectable cAMP. The possible role of cAMP as a symbiotic signal is discussed.

cAMP; legumes; modules; rhizobia; symbiosis


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