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The Journal of Heredity 1999:90(3)
© 1999 The American Genetic Association 90:399-403

Eight new mutants at the k2 Mdh1-n y20 chromosomal region in soybean

XF Chen, J Imsande1, and RG Palmer2,*

Department of Agronomy and the Interdepartmental Genetics Program, the 1Departments of Agronomy and Zoology/Genetics, and 2USDA ARS CICGR unit and the Departments of Agronomy and Zoology/Genetics, Iowa State University, Ames, Iowa, USA *Corresponding author

Eight new mutants were isolated at the k2 Mdh1-n y20 chromosomal region in soybean [Glycine max (L.) Merr.]. Among them, genetic type T234 is yellow foliage and malate dehydrogenase 1 (Mdh1) null; cultivar Mandell is green foliage and Mdh1 null. T234 and Mandell were isolated by screening soybean germplasm for malate dehydrogenase variants. CD-9 is a yellow foliage and Mdh1 null mutant identified in a gene-tagging study with the w4-m mutable line. X-193, X-194, PR-95-649, and PR-95-650 are yellow foliage mutants with Mdh1 null and tan saddle seed coat phenotypes identified in the F2 generation from the cross of T239 (k2) with PI 567.630A (Mdh1-n) designed to estimate recombination values between the k2 and Mdh1-n loci. A95-K55 is a yellow foliage and Mdh1 null mutant with tan saddle seed coat-phenotype identified in the F2 generation from the cross of T239 (k2) with T319 (cyt-Y7). Allelism and inheritance studies were conducted with these eight mutants. The results indicated that the seven new yellow foliage mutants were conditioned by a single recessive nuclear locus and were allelic at the y20 locus. In addition, all eight Mdh1 null mutants were allelic at the Mdh1-n locus. The occurrence of the X-193, X-194, PR-95-649, PR-95-650, and A95-K55 mutants were hypothesized to be due to mutations at the Mdh1 Y20 loci in T239, which resulted in k2 Mdh1-n y20 gametes being produced. Finally, gene symbols were proposed for these eight new mutants and the original gene symbol y15 for T234 has been deleted.


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Home page
 J HeredHome page
J. Imsande, J. Pittig, R. G. Palmer, C. Wimmer, and C. Gietl
Independent Spontaneous Mitochondrial Malate Dehydrogenase Null Mutants in Soybean are the Result of Deletions
J. Hered., July 1, 2001; 92(4): 333 - 338.
[Abstract] [Full Text] [PDF]


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