Trans‐lineage polymorphism and nonbifurcating diversification of the genus Picea

Shuo Feng, Dafu Ru, Yongshuai Sun, Kangshan Mao, Richard Milne, Jianquan Liu

Research output: Contribution to journalArticlepeer-review

Abstract

Nonbifurcating divergence caused by introgressive hybridization is continuously reportedfor groups of closely related species. In this study, we aimed to reconstruct the genome-scaleclassification of deep lineages of the conifer genus Picea, establish their phylogenetic relation-ships and test the bifurcating hypothesis between deeply branching lineages based ongenomic data.

We sequenced the transcriptomes of 35 individuals of 27 taxa covering all main lineages ofthe genus. Four major lineages, comprising three to 12 taxa each, largely consistent with mor-phological evidence, were recovered across the coalescent and integrated nuclear phylogeny. However, many of the individual gene trees recovered contradict one another. Moreover, thewell-supported coalescent tree inferred here differs from previous studies based on various DNA markers, with respect to topology and inter-lineage relationships.

We identified the shared polymorphisms between four major lineages. ABBA–BABA testsconfirmed the inter-lineage gene flow and thus violated the bifurcating divergence model. Gene flow occurred more frequently between lineages distributed in the same continent thanthose disjunct between continents.

Our results indicate that introgression and nonbifurcating diversification apply, evenbetween deeply branching lineages of the conifer genus Picea.
Original languageEnglish
Number of pages12
JournalNew Phytologist
DOIs
Publication statusPublished - 10 Nov 2018

Keywords

  • Picea
  • genome phylogeny
  • deep lineage
  • non-bifurcation
  • shared polymorphisms

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