, Volume 57, Issue 4, pp 367–381 | Cite as

Molecular systematics of the Old World Astragalus (Fabaceae) as inferred from nrDNA ITS sequence data

  • S. Kazempour Osaloo
  • A. A. Maassoumi
  • N. Murakami


This study represents a nuclear rDNA ITS-based phylogenetic analyses of a greater sampling of the Old WorldAstragalus compared to our previous work (212 vs. 134 taxa). Phylogenetic relationships among 212 species (213 accessions) of the Old WorldAstragalus, including newly segregated monotypic genusPodlechiella, the two aneuploid New WorldAstragalus, and five related genera, were inferred from analyses of nuclear rDNA ITS sequences using maximum parsimony. A total of 658 nucleotide sites and four binary characters for indels were analyzed. The results of phylogenetic analyses suggest sect.Phyllolobium, comprising mostly the Chinese species, is placed outside of the so-calledAstragalus s. str. and is a well-supported monophyletic group. The monotypic annual segregate genusThlaspidium (≡Astragalus sect.Thlaspidium, A. thlaspi), is clearly nested withinAstragalus s. str. Among the many sections analyzed here, only sects.Cenanthrum, Caraganella, Eremophysa, Incani, Laxiflori, andLotidium are strongly supported as monophyletic. Our analysis, in agreement with previous studies, shows that the North American euploidAstragalus species are scattered throughout the Old World groups of the genus.

Key words

Astragalus Fabaceae nrDNA ITS Phyllolobium phylogeny Podlechiella Thlaspidium 


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Copyright information

© The New York Botanical Garden 2005

Authors and Affiliations

  • S. Kazempour Osaloo
    • 1
  • A. A. Maassoumi
    • 2
  • N. Murakami
    • 3
  1. 1.Department of Plant BiologyTarbiat Modares UniversityTehranIran
  2. 2.Department of BotanyResearch Institute of Forests and RangelandsTehranIran
  3. 3.Department of Botany, Graduate School of ScienceKyoto UniversityKyotoJapan

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