Temporal diversification in the genus Onosma (Boraginaceae) based on nuclear and plastid DNA sequences
Author:
Nasrollahi Fatemeh1, Kazempour-Osaloo Shahrokh1, Mozaffarian Valyollah2, Zare-Maivan Hassan1
Affiliation:
1. Department of Plant Biology, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, Iran 2. Department of Botany, Research Institue of Forests and Rangelands, Tehran, Iran
Abstract
The genus Onosma is a homogeneous taxon with high morphological variation and
due to the similarities among the Onosma taxa, there are many problems in
their identification. Hence, systematically and taxonomically, it is
considered a difficult genus. In the present study, we included a large
number of Onosma species throughout their distribution range. Using nuclear
(ITS) and two plastids (rpl32-trnL(UAG) and trnH-psbA) markers, we analyzed
the evolutionary history, divergence time and diversification patterns of
Onosma across the tropical, subtropical and temperate regions. Divergence
time estimates suggest the early radiation of Onosma s.l. happened at the
Oligocene-Miocene boundary. BAMM analyses indicate that the best
configuration included one significant shift in diversification rates within
Onosma: on the branch leading to the clade comprised of species of confined
to Iran.
Publisher
National Library of Serbia
Subject
Plant Science,Genetics
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