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The Nodulation Status of Trifolium ambiguum¹

ABSTRACT

Trifolium ambiguum (kura, Pellett or honey clover) is a potentially important clover species, although nodule occurrence on its roots is rare, and evidence is lacking that it benefits from any association with rhizobia. The objective of this study was to ascertain the response patterns of this clover and 7 allied species to 35 diverse strains of Rhizobium trifolii.

Diverse categories of plant response were defined in reciprocal inoculation tests. T. hybridum (alsike) and T. repens f. giganteum (Ladino) were benefited by 31 strains. Twenty-two strains brought about ineffective responses on T. incarnatum (crimson) and T. subterraneum (sub). T. ambiguum was only sparsely nodulated and not benefited by any of the strains. The rhizobia isolated from T. ambiguum brought about typical ranges of plant response of the seven other clover species tested. T. procumbens (low hop) and T. repens f. giganteum (Ladino) were benefited by all of the strains from T. ambiguum. Only three of the Pellett clover strains were effective on T. incarnatum and T. subterraneum. Nodules were not formed on T. ambiguum by any of 52 rhizobial strains from 26 ecologically related species contained in 23 leguminous genera.

Probable explanations for the sparse nodulation and lack of effective response by T. ambiguum to rhizobia are suggested.

¹ Contribution from the Department of Bacteriology, University of Wisconsin, Madison 6. Published with the approval of the Director, Wisconsin Agricultural Experiment Station.

² Department Fellow and Professor of Bacteriology, respectively.

Received for publication October 3, 1952.