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Journal of Heredity Advance Access published online on July 12, 2006
Journal of Heredity, doi:10.1093/jhered/esl015
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© The American Genetic Association. 2006. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org.
Received October 10, 2005
Accepted March 22, 2006

Article

Genetic Analysis of 4 New Mutants at the Unstable k2 Mdh1-n y20 Chromosomal Region in Soybean

Min Xu 1 and Reid G. Palmer 2 *

1 From the Department of Agronomy and Interdepartmental Genetics Graduate Program, Iowa State University, Ames, IA 50011
2 US Department of Agriculture-Agricultural Research Service, Corn Insects and Crop Genetics Research Unit, Department of Agronomy, and Interdepartmental Genetics Graduate Program, Iowa State University, Ames, IA 50011

* To whom correspondence should be addressed.
Reid G. Palmer, E-mail: rpalmer{at}iastate.edu


  Abstract

In soybean (Glycine max (L.) Merr.), a chromosomal region defined by 3 closely linked loci, k2 (tan-saddle seed coat), Mdh1-n (malate dehydrogenase 1 null), and y20 (yellow foliage), is highly mutable. A total of 31 mutants have been reported from this region. In this study, a mutation with tan-saddle seed coat was found from bulk-harvested seed of cultivar Kenwood. Genetic analysis established that this tan-saddle seed coat mutation is allelic to the k2 locus and inherited as a recessive gene. Simple sequence repeat analysis showed that this mutant is not a contaminant from other existing k2 mutants. The mutant was named Kenwood-k2. To test for genetic instability at the k2 Mdh1-n y20 chromosomal region, Kenwood-k2 was crossed reciprocally with cultivars Harosoy and Williams. No new mutants were found in F2 families. In the genetic instability tests of T239 (k2) with cultivar Williams, 3 new mutants with yellow foliage (y20) and malate dehydrogenase 1 null (Mdh1-n) were identified. In the genetic instability tests of T261 (k2 Mdh1-n) with cultivar Williams, no new mutants were found. The Kenwood-k2 and the 3 yellow-foliage, malate dehydrogenase 1-null mutants provide additional genetic materials to study chromosomal aberrations in this mutable/unstable chromosomal region.


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