Effect of the Ethoxy Analog of Rhizobitoxine on Nodulation of Soybeans1

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Abstract
A common property of Rhizobium japonicum strains that are able to nodulate the nodulation restrictive soybean [Glycine max (L.) Merr.] genotype rj1 rj1 is the ability to produce rhizobitoxine (2‐amino‐3‐hydroxypropoxyvinylglycine). The ethoxy analog of rhizobitoxine (aminoethoxyvinylglycine) was tested for potential to modify the nodulating ability of strains of Rhizobium japonicum (Kirchner) Buchanan with Clark rj1rj1 soybeans. The analog was added to broth cultures of Rhizobium at concentrations of 0, 5 ✕ lO−10, 5 ✕ 10−8, 5 ✕ 10−6, 5 ✕ 10−6 and 5 ✕ 10−4 M, 30 hours before being used to inoculate seeds planted in Leonard jars.The analog did not enhance nodulation at any of the concentrations tested. Genetic modification of the rhizobial microsymbiont appears to be a more promising approach for obtaining Rhizobium strains capable of successfully nodulating the rj1 rj1 genotype.

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