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

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Abstract

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.

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Authors and Affiliations

  1. Department of Plant Biology, Tarbiat Modares University, 14115-175, Tehran, Iran

    S. Kazempour Osaloo

  2. Department of Botany, Research Institute of Forests and Rangelands, 13185-116, Tehran, Iran

    A. A. Maassoumi

  3. Department of Botany, Graduate School of Science, Kyoto University, 606-8502, Kyoto, Japan

    N. Murakami

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  1. S. Kazempour Osaloo
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  2. A. A. Maassoumi
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  3. N. Murakami
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Correspondence to S. Kazempour Osaloo.

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Kazempour Osaloo, S., Maassoumi, A.A. & Murakami, N. Molecular systematics of the Old World Astragalus (Fabaceae) as inferred from nrDNA ITS sequence data. Brittonia 57, 367–381 (2005). https://doi.org/10.1663/0007-196X(2005)057[0367:MSOTOW]2.0.CO;2

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  • DOI: https://doi.org/10.1663/0007-196X(2005)057[0367:MSOTOW]2.0.CO;2

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