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The Journal of Heredity 1984:75(6):445-447
© 1984 The American Genetic Association 75:445-447

research-article

Pleiotropy or close linkage of two mutants in soybeans

Reid G. Palmer

U.S. Department of Agriculture, ARS and the Departments of Agronomy and Genetics, Iowa State University Ames, Iowa 50011

Abstract

Genetic studies were undertaken of soybean (Glycine max [L.] Merr.) mutant T253, which Is chlorophyll deficient and has tan-saddle-pattern seed. The chlorophyll-deficient allele was tested against eight nuclear chlorophyll-deficient mutants and was found nonallelic; It was assigned gene symbol y20 The tan-saddle allele was identlfied previously as k2 Mutant y20-k2 was not located on trisomics A, B, or C, and k2 was not linked to the breakpoint of a homozygous chromosome interchange from Pl 101,404B. No linkage was detected between y20-k2 or k2 and seven mutants that were not chlorophyll deficient. About 25 000 F2 and F3 plants were classified, but y20 could not be separated genetically from k2. The lack of crossover genotypes indicated either that the genes are tightly linked or that there is a plelotropic effect. It is suggested that the mutant phenotypes were the result of a small chromosomal deletion.


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This article has been cited by other articles:


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 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.
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