Cytotaxonomy of Dubyaea glaucescens (Compositae-Cichorieae)
14 January 2014
Liu, Ying; Yang, Qin-erRecent molecular phylogenetic analyses indicate that Dubyaea glaucescens (Compositae-Cichorieae) should be transferred to the genus Faberia as F. glaucescens. Here, we present cytological evidence for this transfer. Dubyaea glaucescens had two chromosome numbers, 2n = 34 (diploid) and 2n = 51 (triploid), making the basic chromosome number x = 17. The chromosomes varied in length from 5.82 μm to 2.11 μm, and the karyotypes were formulated respectively as 2n = 20m + 14sm (3sat) for the diploid cytotype and 2n = 30m + 21sm (3sat) for the triploid cytotype. Karyological characters of D. glaucescens, including chromosome number, size, morphology, and karyotype asymmetry, all agree remarkably with those reported previously in Faberia but distinct from those in other species of Dubyaea. The transfer of D. glaucescens to Faberia is thus strongly upheld.