Natural interploidy hybridization among the key taxa involved in the origin of horticultural chrysanthemums

Shuai Qi, Alex D. Twyford, Junyi Ding, James S. Borrell, Long Zhen Wang, Yue-Ping Ma, Nian Wang

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

Understanding hybridization and introgression between natural plant populations can give important insights into the origins of cultivated species. Recent studies suggest differences in ploidy may not create such strong reproductive barriers as once thought, and thus studies into cultivated origins should examine all co-occurring taxa, including those with contrasting ploidy levels. Here, we characterized hybridization between Chrysanthemum indicum, Chrysanthemum vestitum and Chrysanthemum vestitum var. latifolium, the most important wild species involved in the origins of cultivated chrysanthemums. We analysed population structure of 317 Chrysanthemum accessions based on 13 microsatellite markers and sequenced chloroplast trnL-trnF for a subset of 103 Chrysanthemum accessions. We identified three distinct genetic clusters, corresponding to the three taxa. We detected 20 hybrids between species of different ploidy levels, of which 19 were between C. indicum (4x) and C. vestitum (6x) and one was between C. indicum and C. vestitum var. latifolium (6x). Fourteen hybrids between C. indicum and C. vestitum were from one of the five study sites. Chrysanthemum vestitum and C. vestitum var. latifolium share only one chloroplast haplotype. The substantially different number of hybrids between hybridizing species was likely due to different levels of reproductive isolation coupled with environmental selection against hybrids. In addition, human activities may play a role in the different patterns of hybridization among populations.
Original languageEnglish
Number of pages10
JournalJournal of Systematics and Evolution
Early online date18 Aug 2021
DOIs
Publication statusE-pub ahead of print - 18 Aug 2021

Keywords / Materials (for Non-textual outputs)

  • chrysanthemum
  • hybrid
  • microsatellite marker
  • symmetrical introgression
  • trnL-trnF

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