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

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 Cytogenet

journal_title

Comparative cytogenetics

authors

Amaral-Silva PM,Clarindo WR,Carrijo TT,Carvalho CR,Praça-Fontes MM

doi

10.3897/CompCytogen.v10i1.6719

subject

Has Abstract

pub_date

2016-01-22 00:00:00

pages

97-108

issue

1

eissn

1993-0771

issn

1993-078X

journal_volume

10

pub_type

杂志文章