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Background <p>The genus <i>Astragalus</i> is the largest and one of the most diverse genera of flowering plants, particularly in the Northern Hemisphere, with a significant concentration of species in the Irano-Turanian region. Within this genus, section <i>Hymenostegis</i> is notable for its complexity and high levels of endemism, especially in northwestern Iran. During recent field explorations in West Azarbaijan province, a distinct population of <i>Astragalus</i> was identified, differing from known species within section <i>Hymenostegis</i>. This study aimes to describe and analyze this new species and clarify its relationship with closely related taxa using an integrative approach.</p> Results <p><i>Astragalus kuzehrashensis</i> sp. nov. is described following detailed morphological comparisons with its closest relatives, <i>A. chehreganii</i> and <i>A. hakkianus</i>. The new species is distinguished by unique stipule characteristics, leaflet shape, inflorescence structure, and seed micromorphology. Molecular phylogenetic analysis using ITS and <i>ycf</i>1 sequences reveals that <i>A. kuzehrashensis</i> forms a clade with <i>A. chehreganii</i> and <i>A. hakkianus</i>, although it exhibits genetic differences. Genome size estimation confirms that <i>A. kuzehrashensis</i> is hexaploid (2<i>n</i> = 6<i>x</i> = 48), aligning it more closely with <i>A. hakkianus</i> than with the tetraploid <i>A. chehreganii</i>. The distinct morphological characters and genomic data support recognizing <i>A. kuzehrashensis</i> as a new species within section <i>Hymenostegis</i>.</p> Conclusions <p>The identification of <i>A. kuzehrashensis</i> underscores the importance of an integrative taxonomic approach, combining morphological, molecular, and cytogenetic data to resolve species boundaries within complex groups like <i>Astragalus</i> section <i>Hymenostegis</i>. This study highlights the rich biodiversity of the Irano-Turanian floristic region, emphasizing the need for ongoing exploration and conservation efforts, particularly in areas of high endemism. Our findings contribute to a deeper understanding of the taxonomy and evolutionary relationships within the genus <i>Astragalus</i>.</p>

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A new species of Astragalus (Fabaceae) from the Irano-Turanian biodiversity hotspot: an integrative approach

  • 期刊论文

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  • 发表日期：

    2025年1月8日

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  • Zahra Karbalaei,
  • Ali Bagheri,
  • Ali Asghar Maassoumi,
  • Twan Rutten,
  • Frank R. Blattner

摘要

Background

The genus Astragalus is the largest and one of the most diverse genera of flowering plants, particularly in the Northern Hemisphere, with a significant concentration of species in the Irano-Turanian region. Within this genus, section Hymenostegis is notable for its complexity and high levels of endemism, especially in northwestern Iran. During recent field explorations in West Azarbaijan province, a distinct population of Astragalus was identified, differing from known species within section Hymenostegis. This study aimes to describe and analyze this new species and clarify its relationship with closely related taxa using an integrative approach.

Results

Astragalus kuzehrashensis sp. nov. is described following detailed morphological comparisons with its closest relatives, A. chehreganii and A. hakkianus. The new species is distinguished by unique stipule characteristics, leaflet shape, inflorescence structure, and seed micromorphology. Molecular phylogenetic analysis using ITS and ycf1 sequences reveals that A. kuzehrashensis forms a clade with A. chehreganii and A. hakkianus, although it exhibits genetic differences. Genome size estimation confirms that A. kuzehrashensis is hexaploid (2n = 6x = 48), aligning it more closely with A. hakkianus than with the tetraploid A. chehreganii. The distinct morphological characters and genomic data support recognizing A. kuzehrashensis as a new species within section Hymenostegis.

Conclusions

The identification of A. kuzehrashensis underscores the importance of an integrative taxonomic approach, combining morphological, molecular, and cytogenetic data to resolve species boundaries within complex groups like Astragalus section Hymenostegis. This study highlights the rich biodiversity of the Irano-Turanian floristic region, emphasizing the need for ongoing exploration and conservation efforts, particularly in areas of high endemism. Our findings contribute to a deeper understanding of the taxonomy and evolutionary relationships within the genus Astragalus.