Detection of QTLs in a Mediterranean climate associated with fire blight necrosis length in Pyrus communis using a high-resolution genetic linkage map

Gilad Gabay, Yardena Dahan, Oded Cohen, Idan Barshan, Yacov Itzhaki, Moshe A. Flaishman

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Fire blight caused by the bacterium Erwinia amylovora, is the most critical disease of European pear. Breeding of resistant cultivars is a possible solution for a growing demand for healthier alternative practices for disease control. In this study, we present a pear fire blight genetic study using a large F1 population. Quantitative trait loci (QTLs) were detected using a high-resolution genetic map, allowing detection of QTLs with small intervals. A total of 162 offspring crossbred between ‘Harrow Sweet’ (HS, low susceptibility cultivar) and ‘Spadona’ (SPD, high susceptibility cultivar) were studied. We detected a significant genotype effect (p <.0001), which explained 46.4% of the variance of the necrosis length. A major QTL of the main genotype effect (AVG) was detected at 8.8 cM in linkage group (LG) 2 (LOD = 7.7). Additional QTLs were detected in LGs 7, 13 and 15. These markers can greatly contribute to pear breeding programs in a Mediterranean climate and can shed light on potential candidate genes that control fire blight resistance.

Original languageEnglish
Pages (from-to)703-710
Number of pages8
JournalPlant Breeding
Volume140
Issue number4
DOIs
StatePublished - 1 Aug 2021
Externally publishedYes

Keywords

  • European pear
  • QTL
  • disease resistance
  • fire blight
  • genetic map
  • linkage group

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Genetics
  • Plant Science

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