Original Article

Plant Systematics and Evolution

, Volume 294, Issue 1, pp 57-64

Molecular phylogenetic reconstruction of Osmanthus Lour. (Oleaceae) and related genera based on three chloroplast intergenic spacers

  • Shi-Quan GuoAffiliated withLaboratory of Subtropical Biodiversity, Jiangxi Agricultural University
  • , Min XiongAffiliated withLaboratory of Subtropical Biodiversity, Jiangxi Agricultural University
  • , Chun-Feng JiAffiliated withCollege of Forestry, Jiangxi Agricultural University
  • , Zhi-Rong ZhangAffiliated withLaboratory of Subtropical Biodiversity, Jiangxi Agricultural UniversityPlant Germplasm and Genomics Center, Germplasm Bank of Wild Species and Key Laboratory of Biodiversity and Biogeography, Kunming Institute of Botany, Chinese Academy of Sciences
  • , De-Zhu LiAffiliated withPlant Germplasm and Genomics Center, Germplasm Bank of Wild Species and Key Laboratory of Biodiversity and Biogeography, Kunming Institute of Botany, Chinese Academy of Sciences
  • , Zhi-Yong ZhangAffiliated withLaboratory of Subtropical Biodiversity, Jiangxi Agricultural University Email author 

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Abstract

Although polyphyly of Osmanthus has been suggested by different authors, the conclusions of previous studies have lacked robust support due to limited sampling or a paucity of phylogenetic characters. In this study, the phylogeny of Osmanthus was explored using sequences of three informative chloroplast regions (psbJ-petA, rpl32-trnL and rps16-trnQ), including all the five sections of the genus and eight closely related genera. The results confirm that Osmanthus, as presently circumscribed, is a polyphyletic group, containing three or four distinct lineages, i.e. sect. Leiolea (lineage I), sect. Notosmanthus (lineage III), sects. Osmanthus (excluding O. decorus), Siphosmanthus and Linocieroides (lineage IV), and an uncertain lineage including only O. decorus (lineage II). These results emphasize that the generic delimitation within subtribe Oleinae is in need of revision. In addition, this study found that the four cultivar groups of sweet osmanthus formed a paraphyletic clade, implying that cultivated sweet osmanthus might originate from several species.

Keywords

Phylogeny Osmanthus Oleaceae rps16-trnQ rpl32-trnL(UAG) psbJ-petA