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Chromosome morphometry and nuclear DNA content are useful data for cytotaxonomy and for understanding the evolutionary history of different taxa. However, the chromosome number is the only karyotype aspect reported for the species of    Dorstenia    so far. In this study, the nuclear genome size of    Dorstenia   arifolia    (Lamarck, 1786),    Dorstenia   bonijesu    (Carauta &amp; C. Valente, 1983) and    Dorstenia   elata    (Hooker, 1840) was evaluated and their karyotype morphometry accomplished, with the aim of verifying the potential of those parameters to understand evolutionary issues. Mean nuclear 2C value ranged from 2C = 3.49 picograms (pg) for    D.   elata    to 2C = 5.47 pg for    D.   arifolia   , a variation of ± 1.98 pg. Even though showing a marked difference in 2C value, the three species exhibited the same 2n = 32. Corroborating the flow cytometry data, differences in chromosome morphology were found among the karyotypes of the species investigated. Based on this and the only phylogeny proposed for    Dorstenia    thus far, structural rearrangements are related to the karyotype variations among the three species. Besides, the karyological analysis suggests a polyploid origin of the    Dorstenia    species studied here.

comparative cytogenetics

The contribution of cytogenetics and flow cytometry for understanding the karyotype evolution in three    Dorstenia    (Linnaeus, 1753) species (  Moraceae  )