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Seed morphology of the genus Astragalus L. from North Asia

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Astragalus is one of the largest genera of angiosperms and a characteristic component of the steppes and mountains of North Asia. Here, we used scanning electron microscopy to investigate the seed morphology of 56 species of the genus from North Asia. In Astragalus, seed color varies from yellow–green, greenish brown, reddish brown to grayish brown. | Turkish Journal of Botany Turk J Bot (2018) 42: 710-721 © TÜBİTAK doi:10.3906/bot-1802-25 http://journals.tubitak.gov.tr/botany/ Research Article Seed morphology of the genus Astragalus L. from North Asia 1 1,2, 3 3 4 5 Tatyana SHEMETOVA , Andrey ERST * , Wei WANG , Kunli XIANG , Cem VURAL , Zeki AYTAÇ 1 Central Siberian Botanical Garden, Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russia 2 Laboratory of Phylogeny and Systematics, Tomsk State University, Tomsk, Russia 3 State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing, China 4 Department of Biology, Faculty of Arts and Sciences, Erciyes University, Kayseri, Turkey 5 Department of Biology, Faculty of Arts and Sciences, Gazi University, Ankara, Turkey Received: 14.02.2018 Accepted/Published Online: 15.09.2018 Final Version: 22.11.2018 Abstract: Astragalus is one of the largest genera of angiosperms and a characteristic component of the steppes and mountains of North Asia. Here, we used scanning electron microscopy to investigate the seed morphology of 56 species of the genus from North Asia. In Astragalus, seed color varies from yellow–green, greenish brown, reddish brown to grayish brown. Seed shapes include reniform– globose, rombiform, and oblong–elliptical. Seed sizes vary from 1.25 × 0.88 mm to 4.94 × 3.29 mm. Anticlinal walls are straight, undulate, or slightly thickened, and the periclinal walls are aveolate, stellate, pectinate, or rugose. We recognized two main types of seed surface in the genus: reticulate (sect. Cystium, Uliginosi, and Heterodontus) and indistinct primary sculpture (sect. Caprini, Craccina, Alopecuroidei, Glycyphyllos, and Komaroviella). This study describes macro- and micromorphological characters of seeds that would be useful for studying systematics, taxonomy, and evolution within Astragalus in the future. Key words: Astragalus, seed surface, seed morphology, North Asia 1. .