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The capacity to form nitrogen-fixing symbioses with rhizobia is common among species in the Papilionoideae subfamily of the Leguminosae, but nodulation and nitrogen fixation have never been documented in  Cladrastis kentukea  (Dum.-Cours.) Rudd (American yellowwood). The purpose of this study was to test the hypothesis that  C. kentukea  is nodulated by rhizobia. Seedlings were grown in sterile vermiculite and irrigated with a nitrogen-free nutrient solution. In one experiment, the vermiculite was inoculated with rhizobia that nodulate  Maackia amurensis  Rupr. &amp; Maxim., a closely related tree species. During a second experiment, the vermiculite was inoculated with samples of soil collected near trees of  C. kentukea  in a native stand in Alexander County, Illinois. There were no nodules on roots of seedlings harvested 6 weeks after inoculation in either experiment. These results represent strong additional evidence that  C. kentukea  does not form nitrogen-fixing symbioses with rhizobia.

FURTHER EVIDENCE THAT THE LEGUME CLADRASTIS KENTUKEA (AMERICAN YELLOWWOOD) DOES NOT FORM NITROGEN-FIXING SYMBIOSES WITH RHIZOBIA