Development of high-density interspecific genetic maps for the identification of QTLs conferring resistance to Valsa ceratosperma in apple

Yi Tan, Song Lv, Xinying Liu, Ting Gao, Tianhong Li, Yi Wang, Ting Wu, Xinzhong Zhang, Yuepeng Han, Schuyler S. Korban, Zhenhai Han

Research output: Contribution to journalArticlepeer-review

Abstract

Valsa canker (Valsa ceratosperma (Tode ex Fr.) Maire) is one of the most destructive fungal diseases of apple, especially in Eastern Asia. In this study, the first high density genetic linkage map of Malus asiatica × Malus domestica was constructed by 640 simple sequence repeats (SSRs) and 490 single nucleotide polymorphisms (SNPs), which spanned 1497.5 cM with an average marker interval of 1.33 cM per marker. Quantitative trait loci (QTLs) for apple’s resistance to V. ceratosperma isolates 03-8 and xc56 were identified using the linkage map. Lesion lengths were used as the phenotypic data for the QTL analysis, which were measured on 1-year-old shoots inoculated with conidia of the two isolates. One QTL for resistance to isolate 03-8 was mapped on LG 16, and one QTL for resistance to isolate xc56 was detected on LG 9. Our research not only promoted the further understanding of the genetic basis of apple’s resistance to Valsa canker but also provided two molecular markers that might be used in future marker-assisted selection for resistance in apple breeding programs.

Original languageEnglish (US)
Article number10
JournalEuphytica
Volume213
Issue number1
DOIs
StatePublished - Jan 1 2017

Keywords

  • Apple
  • Linkage map
  • QTL
  • Valsa ceratosperma

ASJC Scopus subject areas

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

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