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Molecular and General Genetics MGG

, Volume 251, Issue 1, pp 52–59 | Cite as

A 610 kb YAC clone harbors 7 cM of tomato (Lycopersicon esculentum) DNA that includes themale sterile 14 gene and a hotspot for recombination

  • S. W. Gorman
  • D. Banasiak
  • C. Fairley
  • S. McCormick
Original Paper

Abstract

Pollen development requires both sporophytic and gametophytic gene expression. We are using a map-based cloning technique to isolate sporophytic genes which, when mutant, cause pollen abortion and a male sterile (ms) phenotype in tomato (Lycopersicon esculentum). We have genetically characterized onems locus (ms14) using RFLP analysis and identified flanking markers. High-resolution genomic physical mapping indicates that thems14 locus is located in a ∼300 kb region. We have identified a YAC clone with an insert size of ∼610 kb that contains thems14-linked markers, reflects the organization of the physical map and therefore most probably contains thems14 gene. In addition, we present evidence that the relationship between physical and genetic distance in this chromosomal region changes abruptly from ∼105–140 kb/cM to less than 24 kb/cM, and suggest that the TG393-TG104 region is a hotspot for recombination.

Key words

Positional (map-based) cloning Pulsed field electrophoresis Physical mapping RFLP mapping Pollen development 

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Copyright information

© Springer-Verlag 1996

Authors and Affiliations

  • S. W. Gorman
    • 1
  • D. Banasiak
    • 1
  • C. Fairley
    • 1
  • S. McCormick
    • 1
  1. 1.Plant Gene Expression CenterUSDA/ARS and University of California-BerkeleyAlbanyUSA

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