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QTL analysis for capsaicinoid content in Capsicum.

Arnon Ben-Chaim1, Yelena Borovsky, Matthew Falise

  • 1Department of Plant Breeding and Genetics, Cornell University, 313 Bradfield Hall, Ithaca, NY 14853, USA.

TAG. Theoretical and Applied Genetics. Theoretische Und Angewandte Genetik
|September 9, 2006
PubMed
Summary

Researchers mapped genes controlling pepper pungency, identifying six quantitative trait loci (QTL) for capsaicinoid content. A major QTL, cap7.1, interacted with another marker to significantly influence heat levels in peppers.

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Area of Science:

  • Plant genetics and breeding
  • Agricultural science
  • Biochemistry

Background:

  • Pepper pungency is determined by capsaicinoid compounds synthesized in placental tissues.
  • Variations in capsaicinoid levels contribute to differences in pungency among pepper cultivars.

Purpose of the Study:

  • To analyze the genetic segregation of major capsaicinoids (capsaicin, dihydrocapsaicin, nordihydrocapsaicin).
  • To identify quantitative trait loci (QTL) associated with capsaicinoid content and fruit weight in an inter-specific pepper cross.

Main Methods:

  • An inter-specific cross between Capsicum annuum and Capsicum frutescens was used to generate F(3) families.
  • Quantitative determination of capsaicinoids and fruit weight was performed across multiple trials.
  • A dense molecular map using simple sequence repeat (SSR) markers was constructed to identify QTL.

Main Results:

  • Six QTL controlling capsaicinoid content were detected on three chromosomes.
  • Two QTL for fruit weight were identified, but did not co-localize with capsaicinoid QTL.
  • A digenic interaction between QTL cap7.1 and a marker on chromosome 2 explained a significant portion (24-42%) of the phenotypic variation in capsaicinoid content.

Conclusions:

  • Genetic factors, including a major QTL (cap7.1) and its interaction with other loci, significantly influence capsaicinoid biosynthesis and pepper pungency.
  • Fruit size QTL do not appear to directly influence capsaicinoid content in this cross.
  • The identified QTL provide valuable targets for marker-assisted selection in breeding programs aimed at modulating pepper heat.