Interactions between quantitative trait loci in soybean in which trait variation at one locus is conditional upon a specific allele at another

Karl G. Lark, Kevin Chase, Fred Adler, Levi M. Mansur, James H. Orf

Research output: Contribution to journalArticlepeer-review

191 Scopus citations

Abstract

A large recombinant inbred population of soybean has been characterized for 220 restriction fragment-length polymorphism (RFLP) markers. Values for agronomic traits also have been measured. Quantitative trait loci (QTL) for height, yield, and maturity were located by their linkage to RFLP markers. QTL controlling large amounts of trait variation were analyzed for the dependence of trait variation on particular alleles at a second locus by comparing cumulative distributions of the trail for each genotype (four genotypes per pair of loci). Interesting pairs of loci were analyzed statistically with maximum likelihood and Monte Carlo comparison of additive and epistatic models. For each locus affecting height, variation was conditional upon the presence of a particular allele at a second unlinked locus that itself explained little or no trait variation. The results show that interactions between QTL are frequent and control large effects. Interactions distinguished between different QTL in a single linkage group and between QTL that affect different traits closely linked to one RFLP marker-i.e., distinguished between pleiotropy and closely linked genes. The implications for the evolution of inbreeding plants and for the construction of agronomic breeding strategies are discussed.

Original languageEnglish (US)
Pages (from-to)4656-4660
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Volume92
Issue number10
DOIs
StatePublished - May 9 1995

Keywords

  • epistasis
  • maximum likelihood
  • recombinant inbreds

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