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The Journal of Heredity 1996:87(6):433-437
© 1996 The American Genetic Association 87:433-437

research-article

Inheritance and Linkage With the k2 and Mdh1-n Loci in Soybean

X. F. Chen, and R. G. Palmer

Corresponding Editor: Kendail R. Lamkey

Abstract

Mutants for tan saddle seed coat (k2), for yellow foliage (y20), and for malate de-hydrogenase [EC 1.1.1.37] 1 null (Mdh1-n) have occurred both separately and concurrently in soybean [Glycine max (L.) Merr.]. This study examines their relationships by testing allelisms, inheritance, and recombination among them. Isoline L67–3483 and genetic type T239 are tan saddle seed coat (k2) mutants, and genetic type T261 is a tan saddle seed coat (k2) and malate dehydrogenase null (Mdh1-n) mutant. Soybean accessions USDA PI 567.391 and PI 567.630A are two Mdh1-n mutants. Inheritance studies indicated that the three k2 mutants were allelic and the three Mdh1-n mutants were allelic. Both k2 and Mdh1-n were inherited as single nuclear recessive alleles. PI 567.630A was homozygous for a chromosome trans-location. No linkage was detected between the k2 locus and the translocation breakpoint in PI 567.630A. An approximately 1 ± 1.36% recombination rate between k2 and Mdh1-n was detected in the coupling phase in the crosses of T261 (k2 Mdh1-n) with wild type in about 5,400 F2 plants. In the repulsion phase, however, no recombinants with tan saddle seed and Mdh1–n phenotypes were identified in 3,210 F2 plants from crossing T239 (k2) or L67-3483 (k2) with PI 567.630A (Mdh1-n). These observations indicated that k2 and Mdh1–n are two closely linked loci separated by approximately 1 ±1.36 cM.


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