Variation among seven genotypes of Lycopersicon esculentum and 36 accessions of L. hirsutum for interspecific crossability

Erik J. Sacks, Dina A. St. Clair

Research output: Contribution to journalArticle


To improve the efficiency of introgressing genes from Lycopersicon hirsutum (H) into L. esculentum (E), environmental and genetic variation for the number of progeny per fruit from E x H crosses was quantified. Over three dates in a year, 36 H accessions were crossed to seven E accessions in a greenhouse. The proportion of total variation for the number of E x H progeny per fruit due to environment (dates, location, and error), H accession, E accession, interactions between E and H, and interactions between accessions and environments was 0.42, 0.26, 0.12, 0.11, and 0.09, respectively. Sampling greater numbers of fruit on a single date improved the efficiency of recovering progeny more than increased sampling over time. The specific combination of E and H parents can profoundly affect the number of E x H progeny recovered and therefore the efficiency of gene introgression. Accessions of H from the southern edge of the species' natural geographic range generally yielded few to zero progeny per fruit in crosses with E. In contrast to the southern H accessions, most northern accessions produced greater than 40 E x H progeny per fruit. Most genes within H should be readily accessible for tomato breeding but genes that are found only in southern H accessions may be challenging to introgress.

Original languageEnglish (US)
Pages (from-to)185-191
Number of pages7
Issue number2
StatePublished - Jan 1 1998
Externally publishedYes



  • Crossability
  • Interspecific hybridization
  • Lycopersicon esculentum
  • Lycopersicon hirsutum
  • Tomato

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Genetics
  • Plant Science
  • Horticulture

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