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Genes Controlling Nodulation in Soybean: Rj₅ and Rj₆

Ciba Geigy Seed Div., 1301 W. Washington, Bloomington, IL 61701
Dep. of Agronomy, Univ. of Illinois, 1102 S. Goodwin Ave., Urbana, IL 61801
Plant Physiology and Genetics Res. Unit, USDA-ARS and Dep. of Agronomy, 1201 W. Gregory, Urbana, IL 61801

^* Corresponding author.

A number of genes have been identified that affect root nodule formation in soybean [Glycine max (L.) Merr.] when inoculated with Bradyrhizobium japonicum (Kirchner) Buchanan. The non-nodulating mutant, NN5, used in this study was isolated from N-nitroso-N-methylurea mutagenized ‘Williams’ seed. The objectives of this study were to determine the number of genes responsible for non-nodulation in NN5 and the relationship between the genes in NN5 and the other known non-nodulation genes. From this study it was found that non-nodulation genes in NN5 were not allelic to the rj₁ gene. One of the genes responsible for non-nodulation in NN5 was allelic to the previously identified, but unnamed single recessive gene found in nod139, a non-nodulating mutant of ‘Bragg’. A second recessive gene controlling non-nodulation was identified in NN5 when crosses were made with ‘Harosoy 63’. Harosoy 63 was shown to contain a non-allelic dominant gene that conditions nodulation when in combination with the gene found in nod139 and NN5. The gene symbol Rj₅ is given to this new nodulation gene found in Harosoy 63, and the symbol rj₆ is given to the allelic gene conditioning non-nodulation in nod139 and NN5. Several other cultivars, Williams, Williams 82, Chapman, Resnik, and Chamberlain, do not contain the dominant gene Rj₅.

Received for publication May 22, 1992.

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