Pollinator mediator isolation may be an under estimated factor in promoting homoploid hybrid speciation

Yongpeng Ma, Renchao Zhou, Richard Milne

Research output: Contribution to journalArticlepeer-review

Abstract

It is widely acknowledged that all opolyploidy via hybridization and genome doubling can easily lead to speciation, as polyploid hybrids can be immediately isolated from diploid parental taxa due to high levels of sterility caused by uneven numbers of chromosome complements in their progeny (Soltis and Soltis,2009;Abbottetal., 2013). However, homoploid hybrid speciation (HHS), in which a hybrid lineage becomes genetically isolated from their parents and functions as a distinct evolutionary unit, has been thought to be fairly uncommon (Chaseetal., 2010; Servedioetal., 2013). Schumeretal. (2014) proposed three criteria for proving HHS: evidence of hybridization in the genome, reproductive isolation (RI) of hybrid lineages from parental species, andevidence that this reproductive isolation is a consequence of hybridization. According to these criteria, only one case of HHS in sunflowers was strictly documented in plants till now (Schumeretal., 2014). These criteria highlight two reasons why HHS is harder to detect and prove than allopolyploid speciation: the first is the lack of chromosome number change, whereas the second is that molecular evidence for hybridization becomes harder to detect as the parent species become more closely related, and it is known that HHS tends to involve more closely related parents pecies than allopolyploidy events (Abbottetal.,2013).
Original languageEnglish
Article number1183
JournalFrontiers in plant science
Volume7
Early online date4 Aug 2016
DOIs
Publication statusE-pub ahead of print - 4 Aug 2016
Externally publishedYes

Keywords

  • entomophilous plant
  • flower color
  • homoploid hybrid speciation
  • pollinator mediated isolation
  • reproductive isolation

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