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Mapping salt-tolerance genes in tomato (Lycopersicon esculentum) using trait-based marker analysis

Abstract

The germination responsiveness of an F2 population derived from the cross Lycopersicon esculentum (UCT5) x L. pennellii (LA716) was evaluated for salt tolerance at two stress levels, 150 mM NaCl + 15 mM CaCl2 and 200 mM NaCl + 20 mM CaCl2. Individuals were selected at both tails of the response distribution. The salt-tolerant and salt-sensitive individuals were genotyped at 16 isozyme loci located on 9 of the 12 tomato chromosomes. In addition, an unselected (control) F2 population was genotyped at the same marker loci, and gene frequencies were estimated in both selected and unselected populations. Trait-based marker analysis was effective in identifying genomic locations (quantitative trait loci, QTLs) affecting salt tolerance in the tomato. Three genomic locations marked by Est-3 on chromosome 1, Prx-7 on chromosome 3, and 6Pgdh-2 and Pgi-1 on chromosome 12 showed significant positive effects, while 2 locations associated with Got-2 on chromosome 7 and Aps-2 on chromosome 8 showed significant negative effects. The identification of genomic locations with both positive and negative effects on this trait suggests the likelihood of recovering transgressive segregants in progeny derived from these parental lines. Similar genomic locations were identified when selection was made either for salt tolerance or salt sensitivity and at both salt-stress treatments. Comparable results were obtained in uni- and bidirectional selection experiments. However, when marker allele gene frequencies in a control population are unknown, bidirectional selection may be more efficient than unidirectional selection in identifying marker-QTL associations. Results from this study are discussed in relationship to the use of molecular markers in developing salt-tolerant tomatoes.

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Communicated by G. Wenzel

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Foolad, M.R., Jones, R.A. Mapping salt-tolerance genes in tomato (Lycopersicon esculentum) using trait-based marker analysis. Theoret. Appl. Genetics 87, 184–192 (1993). https://doi.org/10.1007/BF00223763

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Key words

  • Tomato
  • Salt tolerance
  • Seed germination
  • Isozyme markers
  • QTL mapping