Phylogeography of the highly invasive sugar beet nematode, Heterodera schachtii (Schmidt, 1871), based on microsatellites

Jiyeon Kim, Gang Ni, Taeho Kim, Jae Yong Chun, Elizabeth M.A. Kern, Joong Ki Park

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Plant-parasitic nematodes (PPNs) threaten crop production worldwide. Yet few studies have examined their intraspecific genetic diversity or patterns of invasion, critical data for managing the spread of these cryptic pests. The sugar beet nematode Heterodera schachtii, a global invader that parasitizes over 200 plant species, represents a model for addressing important questions about the invasion genetics of PPNs. Here, a phylogeographic study using 15 microsatellite markers was conducted on 231 H. schachtii individuals sampled from four continents, and invasion history was reconstructed through an approximate Bayesian computation approach, with emphasis on the origin of newly discovered populations in Korea. Multiple analyses confirmed the existence of cryptic lineages within this species, with the Korean populations comprising one group (group 1) and the populations from Europe, Australia, North America, and western Asia comprising another (group 2). No multilocus genotypes were shared between the two groups, and large genetic distance was inferred between them. Population subdivision was also revealed among the populations of group 2 in both population comparison and STRUCTURE analyses, mostly due to different divergent times between invasive and source populations. The Korean populations showed substantial genetic homogeneity and likely originated from a single invasion event. However, none of the other studied populations were implicated as the source. Further studies with additional populations are needed to better describe the distribution of the potential source population for the East Asian lineage.

Original languageEnglish
Pages (from-to)324-336
Number of pages13
JournalEvolutionary Applications
Volume12
Issue number2
DOIs
StatePublished - 1 Feb 2019

Bibliographical note

Publisher Copyright:
© 2018 The Authors. Evolutionary Applications published by John Wiley & Sons Ltd

Keywords

  • approximate Bayesian computation
  • cryptic lineage
  • cyst nematode
  • ghost population
  • invasion genetics

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