Journal ArticleDOI
Whole-genome triplication and species radiation in the southern African tribe Heliophileae (Brassicaceae)
Terezie Mandáková,Klaus Mummenhoff,Ihsan A. Al-Shehbaz,Ladislav Mucina,Andreas Mühlhausen,Martin A. Lysak +5 more
TLDR
In this article, the authors present the first in-depth information on chromosome numbers, rDNA in situ localization, genomic structure, and phylogenetic relationship within the unigeneric tribe Heliophileae.Abstract:
The unigeneric tribe Heliophileae includes ca. 90 Heliophila
species, all endemic to southern Africa. The tribe is
morphologically the most diverse Brassicaceae lineage in every
aspect of habit, foliage, flower and fruit morphology. Despite
this diversity, virtually nothing is known about its origin and
genome evolution. Here we present the first in-depth
information on chromosome numbers, rDNA in situ localization,
genome structure, and phylogenetic relationship within
Heliophileae. Chromosome numbers determined in 27 Heliophila
species range from 2n = 16 to 2n = ca. 88, but 2n = 20 and 22
prevail in 77% of the examined species. Chromosome-number
variation largely follows three major lineages (A, B, and C)
resolved in the ITS phylogeny. Clade A species mostly have a
chromosome number of 2n = 20, whereas 2n = 22 is the dominant
number in clade C (2n = 16 and 22 were counted in two diploid
species of clade B). The number and position of 5S and 45S rDNA
loci cannot be employed as phylogenetically informative
characters. Seven species with different chromosome number and
from the three ITS clades were analyzed by comparative
chromosome painting. In all species analyzed, 90% of painting
probes unveiled three homeologous chromosome regions in
Heliophila haploid chromosome complements. These results
suggest that all Heliophila species, and probably the entire
tribe Heliophileae, experienced a whole-genome triplication
(WGT) event. We hypothesize that the mesohexaploid ancestor
arose through hybridization between genomes resembling the
Ancestral Crucifer Karyotype with n = 8. The WGT has been
followed by species-specific chromosome rearrangements
(diploidization) resulting in descending dysploidy towards
extant quasi-diploid genomes. The WGT might have contributed to
diversification and species radiation in Heliophileae. To our
knowledge, this is the first study to document polyploidy as a
potential major mechanism for the radiation of a Cape plant
lineage.read more
Citations
More filters
Proceedings Article
Image Processing
TL;DR: The main focus in MUCKE is on cleaning large scale Web image corpora and on proposing image representations which are closer to the human interpretation of images.
Journal ArticleDOI
A Time-Calibrated Road Map of Brassicaceae Species Radiation and Evolutionary History
TL;DR: A comprehensive time-calibrated framework with important divergence time estimates based on whole-chloroplast sequence data for 29 Brassicaceae species concludes that species radiation, paralleled by high levels of neopolyploidized, follows genome size decrease, stabilization, and genetic diploidization.
Journal ArticleDOI
Polyploid Evolution of the Brassicaceae during the Cenozoic Era
Sateesh Kagale,Sateesh Kagale,Stephen J. Robinson,John Nixon,Rong Xiao,Terry Huebert,Janet A. Condie,Dallas Kessler,Wayne E. Clarke,Patrick P. Edger,Matthew G. Links,Andrew G. Sharpe,Isobel A. P. Parkin +12 more
TL;DR: The synchronized diversification of Brassicaceae species suggests that polyploid events may have conferred higher adaptability and increased tolerance toward the drastically changing global environment, thus facilitating species radiation.
Journal ArticleDOI
Post-polyploid diploidization and diversification through dysploid changes.
TL;DR: Dysploidies may lead to reproductive isolation among post-polyploid offspring and significantly contribute to speciation and cladogenetic events.
Journal ArticleDOI
Is post-polyploidization diploidization the key to the evolutionary success of angiosperms?
TL;DR: It is argued here that it is the diploidsization process that is responsible for the ‘lag phase’ between polyploidization events and lineage diversification, and has therefore made a significant contribution to the evolutionary success of flowering plants.
References
More filters
Journal ArticleDOI
MrBayes 3: Bayesian phylogenetic inference under mixed models
TL;DR: MrBayes 3 performs Bayesian phylogenetic analysis combining information from different data partitions or subsets evolving under different stochastic evolutionary models to analyze heterogeneous data sets and explore a wide variety of structured models mixing partition-unique and shared parameters.
Image processing with ImageJ
TL;DR: ImageJ is an open source Java-written program that is used for many imaging applications, including those that that span the gamut from skin analysis to neuroscience, and can read most of the widely used and significant formats used in biomedical images.
Journal ArticleDOI
jModelTest: Phylogenetic Model Averaging
TL;DR: jModelTest is a new program for the statistical selection of models of nucleotide substitution based on "Phyml" that implements 5 different selection strategies, including "hierarchical and dynamical likelihood ratio tests," the "Akaike information criterion", the "Bayesian information criterion," and a "decision-theoretic performance-based" approach.
Journal ArticleDOI
Bayesian Phylogenetics with BEAUti and the BEAST 1.7
TL;DR: The Bayesian Evolutionary Analysis by Sampling Trees (BEAST) software package version 1.7 is presented, which implements a family of Markov chain Monte Carlo algorithms for Bayesian phylogenetic inference, divergence time dating, coalescent analysis, phylogeography and related molecular evolutionary analyses.
Journal ArticleDOI
Trends, Rhythms, and Aberrations in Global Climate 65 Ma to Present
TL;DR: This work focuses primarily on the periodic and anomalous components of variability over the early portion of this era, as constrained by the latest generation of deep-sea isotope records.
Related Papers (5)
An atlas of over 90,000 conserved noncoding sequences provides insight into crucifer regulatory regions
Annabelle Haudry,Adrian E. Platts,Emilio Vello,Douglas R. Hoen,Mickael Leclercq,Robert J. Williamson,Ewa Forczek,Zoé Joly-Lopez,Joshua G. Steffen,Khaled M. Hazzouri,Ken Dewar,John R. Stinchcombe,Daniel J. Schoen,Xiaowu Wang,Jeremy Schmutz,Christopher D. Town,Patrick P. Edger,J. Chris Pires,Karen S. Schumaker,David E. Jarvis,Terezie Mandáková,Martin A. Lysak,Erik van den Bergh,M. Eric Schranz,Paul M. Harrison,Alan M. Moses,Thomas E. Bureau,Stephen I. Wright,Mathieu Blanchette +28 more
The butterfly plant arms-race escalated by gene and genome duplications.
Patrick P. Edger,Patrick P. Edger,Patrick P. Edger,Hanna M. Heidel-Fischer,Michaël Bekaert,Jadranka Rota,Gernot Glöckner,Gernot Glöckner,Adrian E. Platts,David G. Heckel,Joshua P. Der,Joshua P. Der,Eric K. Wafula,Michelle Tang,Johannes A. Hofberger,Ann Smithson,Jocelyn C. Hall,Matthieu Blanchette,Thomas E. Bureau,Stephen I. Wright,Claude W. dePamphilis,M. Eric Schranz,Michael S. Barker,Gavin C. Conant,Niklas Wahlberg,Heiko Vogel,J. Chris Pires,Christopher W. Wheat +27 more