Abstract:
: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 & 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 Dorstenia elata to 2C = 5.47 pg for Dorstenia 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.
journal_name
Comp Cytogenetjournal_title
Comparative cytogeneticsauthors
Amaral-Silva PM,Clarindo WR,Carrijo TT,Carvalho CR,Praça-Fontes MMdoi
10.3897/CompCytogen.v10i1.6719subject
Has Abstractpub_date
2016-01-22 00:00:00pages
97-108issue
1eissn
1993-0771issn
1993-078Xjournal_volume
10pub_type
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