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A map of rye chromosome 2R using isozyme and morphological markers.

C Benito1, C Zaragoza, F J Gallego

  • 1Department of Genetics, Faculty of Biology, University Complutense, E-28040, Madrid, Spain.

TAG. Theoretical and Applied Genetics. Theoretische Und Angewandte Genetik
|November 12, 2013
PubMed
Summary
This summary is machine-generated.

Genetic linkage of leaf peroxidase (L2Per) loci was studied in rye. Researchers identified linkage between purple seeds (Ps) and monstrosum ears (mo) loci with L2Per loci on chromosome 2R, suggesting gene order.

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Area of Science:

  • Plant genetics
  • Molecular biology
  • Chromosomal mapping

Background:

  • Leaf peroxidases (L2Per) are enzymes with various isozymic forms.
  • Understanding gene linkage is crucial for plant breeding and genetic studies.
  • Rye (Secale cereale) genetics provides a model for cereal crop research.

Purpose of the Study:

  • To investigate the genetic segregation of leaf peroxidase isozymic loci in rye.
  • To determine the linkage relationships between leaf peroxidase loci and known seed and ear morphology loci.
  • To contribute to the chromosomal mapping of genes in rye.

Main Methods:

  • Segregation analysis in backcross and F2 generations of rye.
  • Genotyping for leaf peroxidase isozymic loci (L2Per).
  • Analysis of linkage with purple seeds (Ps) and monstrosum ears (mo) loci.

Main Results:

  • Significant linkage was observed between Ps, L2Per-3b, mo, and L2Per-2 loci.
  • Ps and mo loci are on chromosome 2R; L2Per-3b and L2Per-2 are on the 2RS arm.
  • Proposed gene orders: Ps ... L2Per-3b ... mo ... L2Per-2 or Ps ... mo ... L2Per-3b ... L2Per-2.
  • The mo locus is suggested to be on the 2RS arm.
  • A probable arrangement on chromosome 2R: dw2 ... Ps ... (L2Per-3a ... L2Per-3b ... mo) ... L2Per-2.

Conclusions:

  • Leaf peroxidase loci are linked to genes controlling seed color and ear morphology in rye.
  • The study refines the genetic map of rye chromosome 2R, particularly the 2RS arm.
  • Further research is needed to precisely map L2Per-4 loci relative to other mapped loci on 2RS.