o:7735 Relative genome size variation in the Stachys recta group in southeastern Europe en Abstract: With many subordinate or presumably closely related local endemic or subendemic taxa, Stachys recta forms a polymorphic group. To explore the variation in relative genome size and to identify patterns that may unravel the evolutionary history of the taxonomically complex S. recta group, relative genome size (RGS) was assessed for a total of 155 accessions from 55 populations of 18 taxa in southeastern Europe (S. albanica, S. angustifolia, S. anisochila, S. atherocalyx, S. beckeana, S. goulimyi, S. graeca, S. leucoglossa, S. parolinii, S. patula, S. recta subsp. baldaccii, S. r. subsp. doerfleri, S. r. subsp. olympica, S. r. subsp. recta, S. r. subsp. rhodopaea, S. r. subsp. subcrenata, S. tetragona and S. zepcensis). Flow cytometry was used to estimate the relative genome size, expressed here as a ratio of fluorescences between the individual and the standard (Bellis perennis), and varying from 0.43 to 0.71. Although several studies of other taxonomically complex taxa have shown correlations between intraspecific GS variation and morphology or environmental factors, and geographic segregation, we found no patterns in the RGS variation of the analysed samples with respect to taxonomy, geography or ecology. 1552100 978-86-6275-176-8 91552100 168629001 2025-05-30T13:06:53.680Z 44 no 46 Milana Ranimirović 46 Đurović Sanja 46 Gordana Tomović 46 Nevena Kuzmanović 46 Uroš Buzurović Institute of Soil Science 0009-0000-7702-659X 46 Lazar Milivojević 46 Marjan Niketić application/pdf 678951 https://unilib.phaidrabg.rs/o:7735 no yes 1 70 92000004 71A05 Book of Abstracts: 15th Symposium on the Flora of Southeastern Serbia and Neighboring Regions, Niš, 23th to 25th May 2025 32 33 2025