Karbalaei Zahra, Bagheri Ali, Maassoumi Ali Asghar, Rutten Twan, Blattner Frank R
Department of Plant and Animal Biology, Faculty of Biological Science and Technology, University of Isfahan, Isfahan, 81746-73441, Iran.
Botany Research Division, Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO), Tehran, 13185-116, Iran.
Bot Stud. 2025 Jan 8;66(1):1. doi: 10.1186/s40529-024-00448-6.
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.
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.
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.
黄芪属是开花植物中最大且最多样化的属之一，尤其是在北半球，在伊朗 - 图兰地区物种高度集中。在该属中，膜苞组以其复杂性和高特有性而闻名，特别是在伊朗西北部。在最近对西阿塞拜疆省的野外考察中，发现了一个独特的黄芪种群，它与膜苞组内已知物种不同。本研究旨在描述和分析这个新物种，并采用综合方法阐明其与近缘类群的关系。
通过与其最亲近的近缘种——切赫雷加尼黄芪和哈基亚努斯黄芪进行详细的形态学比较，描述了库泽赫拉申斯黄芪新种。该新物种的独特之处在于其托叶特征、小叶形状、花序结构和种子微形态。使用ITS和ycf1序列进行的分子系统发育分析表明，库泽赫拉申斯黄芪与切赫雷加尼黄芪和哈基亚努斯黄芪形成一个分支，尽管它表现出遗传差异。基因组大小估计证实库泽赫拉申斯黄芪是六倍体（2n = 6x = 48），与哈基亚努斯黄芪的亲缘关系比与四倍体的切赫雷加尼黄芪更近。独特的形态特征和基因组数据支持将库泽赫拉申斯黄芪认定为膜苞组内的一个新物种。
库泽赫拉申斯黄芪的鉴定强调了综合分类学方法的重要性，即将形态学、分子和细胞遗传学数据结合起来，以解决黄芪属膜苞组等复杂类群中的物种界限问题。本研究突出了伊朗 - 图兰植物区系丰富的生物多样性，强调了持续进行探索和保护工作的必要性，特别是在特有性高的地区。我们的研究结果有助于更深入地理解黄芪属的分类学和进化关系。
