Qtl mapping for resistance to cankers induced by pseudomonas syringae pv. Actinidiae (psa) in a tetraploid actinidia chinensis kiwifruit population

Jibran Tahir, Cyril Brendolise, Stephen Hoyte, Marielle Lucas, Susan Thomson, Kirsten Hoeata, Catherine McKenzie, Andrew Wotton, Keith Funnell, Ed Morgan, Duncan Hedderley, David Chagné, Peter M. Bourke, John McCallum*, Susan E. Gardiner, Luis Gea

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Polyploidy is a key driver of significant evolutionary changes in plant species. The genus Actinidia (kiwifruit) exhibits multiple ploidy levels, which contribute to novel fruit traits, high yields and resistance to the canker-causing dieback disease incited by Pseudomonas syringae pv. actinidiae (Psa) biovar 3. However, the genetic mechanism for resistance to Psa observed in polyploid kiwifruit is not yet known. In this study we performed detailed genetic analysis of a tetraploid Actinidia chinensis var. chinensis population derived from a cross between a female parent that exhibits weak tolerance to Psa and a highly Psa-resistant male parent. We used the capture-sequencing approach across the whole kiwifruit genome and generated the first ultra-dense maps in a tetraploid kiwifruit population. We located quantitative trait loci (QTLs) for Psa resistance on these maps. Our approach to QTL mapping is based on the use of identity-by-descent trait mapping, which allowed us to relate the contribution of specific alleles from their respective homologues in the male and female parent, to the control of Psa resistance in the progeny. We identified genes in the diploid reference genome whose function is suggested to be involved in plant defense, which underly the QTLs, including receptor-like kinases. Our study is the first to cast light on the genetics of a polyploid kiwifruit and suggest a plausible mechanism for Psa resistance in this species.

Original languageEnglish
Article number967
Pages (from-to)1-21
Number of pages21
JournalPathogens
Volume9
Issue number11
DOIs
Publication statusPublished - 20 Nov 2020

Keywords

  • Bacterial pathogen
  • Chromosome pairing
  • Kiwifruit
  • Perennials
  • Polygenic resistance
  • Polyploid genetics
  • QTLs

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