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The Journal of Heredity 1997:88(6):543-545
© 1997 The American Genetic Association 88:543-545

other

Complementation of Nodulation Genes of Various Mutants in Common Bean (Phaseolus vulgaris L.)

S. J. Park, and B. R. Buttery

Agriculture and Agri-food Canada, Greenhouse and Processing Crops Research Centre Harrow, Ontario NOR 1GO, Canada

Corresponding Editor: Gary E. Hart

Abstract

Nodulation mutants induced by EMS mutagenesis were available from two different germplasm sources of common bean (Phaseolus vulgaris L.). They were the lines R32 (nitrate tolerant supernodulation, NTSN, nts gene), R69 (ineffective nodulation, IN, nie gene), and R99 (nonnodulation, NN, nnd-2 gene) originating from OAC Rico navy bean, and CIAT lines N0D125 (NN, sym-1 gene) and N0D238 (IN, sym-2 gene) from RIZ3O small red variegated bean. Crosses between the two mutant groups were made to determine genetic cornplementation of nodulation genes of the mutants. Nodulation of all F1s between the two sources were similar to that of the wild type, suggesting the presence of genetic complementation. The F2s revealed that both sym-2 and nie, and sym-1 and nnd-2 were epistatic to nts, and sym-1 and nnd-2 were epistatic to sym-2 and nie. The nie of R69 was epistatic to sym-2 of N0D238. Genes sym-2 and nie of NN between the two sources were nonallelic. A series of epistatic control of nod ulation genes was discussed in context of progressive timing of nodulation ontogeny.


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