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An RFLP linkage map of Lycopersicon peruvianum.

J W van Ooijen1, J M Sandbrink, M Vrielink

  • 1Centre for Plant Breeding and Reproduction Research (CPRO-DLO), P.O. Box 16, 6700, AA Wageningen, The Netherlands.

TAG. Theoretical and Applied Genetics. Theoretische Und Angewandte Genetik
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Summary

Researchers mapped genes for bacterial canker resistance in tomato using RFLP markers. They found reduced recombination in male meiosis, potentially due to gametophytic selection, impacting genetic map length.

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Area of Science:

  • Plant genetics and breeding
  • Molecular markers
  • Tomato genomics

Background:

  • Bacterial canker is a significant disease affecting tomato production.
  • Understanding the genetic basis of resistance is crucial for developing resistant cultivars.
  • Lycopersicon peruvianum is a wild tomato relative known to possess resistance genes.

Purpose of the Study:

  • To map genes conferring resistance to bacterial canker in tomato.
  • To construct a genetic linkage map for Lycopersicon peruvianum using RFLP markers.
  • To compare the L. peruvianum map with an existing map of L. esculentum x L. pennellii.

Main Methods:

  • Generated backcross populations between resistant and susceptible Lycopersicon peruvianum accessions.
  • Utilized Restriction Fragment Length Polymorphism (RFLP) markers for linkage analysis.
  • Compared the constructed genetic map with a map from a Lycopersicon esculentum x Lycopersicon pennellii F2 population using shared markers.

Main Results:

  • A genetic linkage map of L. peruvianum was successfully constructed.
  • The L. peruvianum map showed high similarity to the L. esculentum x L. pennellii map in marker order and chromosome length, with one exception on chromosome 9.
  • Reduced recombination was observed in male meiosis compared to female meiosis, suggesting potential gametophytic selection.

Conclusions:

  • The study successfully mapped genes for bacterial canker resistance in tomato.
  • The genetic map of L. peruvianum provides a valuable resource for further genetic studies and breeding efforts.
  • Reduced male recombination rates in tomato may be influenced by gametophytic selection acting on parental genotypes.