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

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 Dorste...

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Bibliographic Details
Published in:Comparative cytogenetics 2016-01, Vol.10 (1), p.97-108
Main Authors: Amaral-Silva, Paulo Marcos, Clarindo, Wellington Ronildo, Carrijo, Tatiana Tavares, Carvalho, Carlos Roberto, Praça-Fontes, Milene Miranda
Format: Article
Language:English
Subjects:
Biological evolution
Chromosome number
Chromosomes
Cytogenetics
Deoxyribonucleic acid
DNA
Dorstenia
Evolutionary genetics
Flow cytometry
Genomes
Karyotypes
Morphology
Morphometry
Phylogeny
Polyploidy
Species
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Summary: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.
ISSN:1993-0771
1993-078X
DOI:10.3897/CompCytogen.v10i1.6719