Plant Physiology 91:690-693 (1989)
© 1989 American Society of Plant Biologists
Microbe-Plant Interactions
Nodule Formation Is Stimulated by the Ethylene Inhibitor Aminoethoxyvinylglycine 1
N. Kent Peters and
Deborah K. Crist-Estes
Biotechnology Center, Ohio State University, Columbus, Ohio 43210-1002,
Department of Agronomy, Ohio State University, Columbus, Ohio 43210-1002
Previous researchers found that formation and function of nitrogen-fixing nodules on legume roots were severely inhibited by addition of exogenous ethylene. Nodule formation by Rhizobium meliloti on Medicago sativa was stimulated twofold when the ethylene biosynthesis inhibitor aminoethoxyvinylglycine (AVG) was added with the inoculum. Stimulation of nodule formation by AVG showed a similar concentration dependence as inhibition of ethylene biosynthesis, suggesting that the primary action of AVG is the inhibition of ethylene biosynthesis. When AVG was added 2 to 3 days after inoculation, the number of nodules formed was still increased. On a per plant basis, however, the average nitrogen fixation was unchanged by AVG treatment and was independent of nodule number.
1 This work was supported in part by state and federal funds appropriated to the Ohio Agricultural Research and Development Center, The Ohio State University. Manuscript No. 45-89. Additional support for this research provided to N. K. P. by a National Science Foundation Plant Biology Postdoctoral Fellowship (CDB-8412394), and by a National Science Foundation Presidential Young Investigator award to S. R. Long with matching support from Agrigenetics, Madison, WI.
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