Divergent genome sizes reflect the infrafamilial subdivision of the neotropical woody Marcgraviaceae

摘要: Neotropical Marcgraviaceae comprise about seven genera and 130 species of lianas shrubs. They predominantly occur in lowland or montane rainforests are characterized by a variety pollination systems. Early classifications subdivided into subfamilies Marcgravioideae Noranteoideae, concept supported molecular data. Using flow cytometry chromosome numbers, we investigated the role genome size polyploidization evolution how sizes distributed between proposed infrafamilial groups. To do this determined counts for six 22 first time. Our study supports subfamilial classification family, revealing contrasting Noranteoideae (2C = 5.5–21.5 pg) (2C = 2.3–6.2 pg). Polyploidy is considered to be main source variation as each subfamily higher nuclear DNA amounts were associated with ploidy. In addition, changes independent polyploidy also observed some genera, suggesting an additional repetitive abundance Marcgraviaceae. A high base number (x = 18; 2n = 36 ∼70) points undetected lower diploid level palaeopolyploidy. show remarkable (nine-fold) size, several have among highest reported tropical woody angiosperms worldwide. © 2014 The Linnean Society London, Botanical Journal Society, 2015, 177, 1–14.