Phylogeographic study reveals the origin and evolutionary history of a Rhododendron species complex in Taiwan

Jeng Der Chung, Tsan Piao Lin, Yu Ling Chen, Yu Pin Cheng, Shih Ying Hwang

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

This study infers a single origin and a once-widespread distribution of the Rhododendron pseudochrysanthum species complex in Taiwan based on chloroplast DNA (cpDNA) variation. In total, 124 individuals from five endemic Rhododendron species were used for amplifications of two chloroplast intergenic spacers: trnL-trnF and atpB-rbcL. The haplotype and nucleotide diversities were much lower for the R. pseudochrysanthum complex, comprised of the species R. pseudochrysanthum, R. morii, Rhododendron rubropunctatum, and Rhododendron hyperythrum, than for Rhododendron formosanum. Two measures of pairwise population differentiation, NST and FST, consistently revealed mostly non-significant levels of genetic divergence between populations of the R. pseudochrysanthum complex. No genetic difference was found among the four species of the R. pseudochrysanthum complex by analysis of molecular variance (AMOVA), which is concordant with the parsimonious topology of cpDNA haplotypes for the complex. Nested clade analysis (NCA) of the cpDNA haplotypes indicated that restricted gene flow with isolation-by-distance characterized the recolonization pattern of the R. pseudochrysanthum complex. In contrast, the NCA analysis indicated a contiguous range expansion for cpDNA haplotypes of R. formosanum. This research suggests a once-widespread distribution of the R. pseudochrysanthum complex probably via north-to-south colonization of mid-elevations during low-temperature periods of the Pleistocene. Population fragmentation followed the warmer climate which began in the Holocene and resulted in the present-day range contraction into high elevations.

Original languageEnglish
Pages (from-to)14-24
Number of pages11
JournalMolecular Phylogenetics and Evolution
Volume42
Issue number1
DOIs
Publication statusPublished - 2007 Jan 1

Keywords

  • Evolutionary origin
  • Phylogeography
  • Rhododendron
  • Species complex
  • Taiwan
  • cpDNA

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Molecular Biology
  • Genetics

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