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Inheritance of Nonnodulating Mutants of Sweetclover

Dep. of Plant Breeding and Biometry, 252 Emerson Hall, Cornell Univ., Ithaca, NY 14853-1902
Boyce Thompson Inst. for Plant Res., Tower Road, Ithaca, NY 14853-1801

^* Corresponding author.

Legume mutants defective in nodule formation are useful for understanding interactions between host and bacterium. Nonallelic nodulation mutants have been relmrted within only a few legume species. Inheritance of nonnodulation in 10 sweetclover (Melilotus alba Desr.) mutants was determined from F₁, F₂, and F₃ generations derived from crosses between each mutant and the nodulating accession U389. Nonnodulation in each mutant was conditioned by a single recessive gene. Complementation analysis was performed on F₁ and F₂ seedlings derived from diallel crosses among the mutants. Five of the mutants were nonallelic, indicating that at least five different genes are involved in nodule formation in M. alba. The following symbols are proposed for the genes controlling nonnodulation of these sweetclover mutants: sym-1, sym-2, sym-3, sym-4, and sym-5.

Received for publication July 18, 1990.

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