Reticulate evolution in the Acrolophus subgroup (Centaurea L., Compositae) from the western Mediterranean: Origin and diversification of section Willkommia Blanca

Suárez‐Santiago, Víctor N.; Salinas, María; Garcia‐Jacas, Núria; Soltis, Pamela S.; Soltis, Douglas E.; Blanca, Gabriel

doi:10.1016/j.ympev.2006.08.006

Cited by 59 publications

(70 citation statements)

References 58 publications

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“…Our study confirms the results of Ochsmann (2000) and Suárez-Santiago et al (2007) that the C. paniculata group is well separated from the C. stoebe group. The distinct position of the C. paniculata group is furthermore supported by morphological differences (Ochsmann, 2000), and by c. 1.5 higher homoploid genome size at diploid level in the C. paniculata group (Mráz, unpubl.).…”

Section: Its Variation and Phylogenetic Relationships Within And Betwsupporting

confidence: 92%

“…Acrolophus). Although the likelihood ratio test (baseml package in PAML; Yang, 2007) rejected the assumption of constancy rate of ITS evolution in our data (p = 0.01), this was not the case for data set of Suárez-Santiago et al (2007) probably due to larger number of taxa used in latter study. The TamuraNei substitution model with gamma distribution was chosen using online FindModel server (www.hiv.lanl.gov/content/sequence/ findmodel/findmodel) and was applied to calculate mean genetic distances between the major clades using MEGA 4.01.…”

Section: Divergence Time Estimationcontrasting

confidence: 59%

“…One could argue, however, that such a pattern can reflect directional homogenization towards the A ribotype and loss of the B ribotype in diploid C. stoebe s.str. This hypothesis seems less plausible because a lack of concerted evolution and conservation of different ribotypes is the rule in the groups of Centaurea investigated to date (present data; Suárez-Santiago et al, 2007;Garcia-Jacas et al, 2009;Boršić et al, 2011;Hilpold, pers. comm.).…”

Section: Haplotype Diversity Analysesmentioning

confidence: 67%

“…Schmidt and Schilling, 2000;Kay et al, 2006). The second one corresponds to 3 Â 10 À9 substitution derived from the tribe Madieae (Baldwin and Sanderson, 1998) and used by Suárez-Santiago et al (2007) to estimate divergence time between sections Willkommia and Centaurea (syn. Acrolophus).…”

Section: Divergence Time Estimationmentioning

confidence: 99%

“…atlantica (Font Quer) Blanca and C. debdouensis Breitw. and Podlech has been explained by recent hybridization (Suárez-Santiago et al, 2007).…”

Section: Introductionmentioning

confidence: 98%

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Allopolyploid origin of highly invasive Centaurea stoebe s.l. (Asteraceae)

Mráz

Garcia‐Jacas

Gex-Fabry

et al. 2012

Molecular Phylogenetics and Evolution

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a b s t r a c tSpotted knapweed (Centaurea stoebe) occurs from Western Asia to Western Europe both as diploid and tetraploid cytotypes, predominantly in single-cytotype populations with higher frequency of diploid populations. Interestingly, only tetraploids have been recorded so far from its introduced range in North America where they became highly invasive.We performed phylogenetic and network analyses of more than 40 accessions of the C. stoebe and C. paniculata groups and other related taxa using cloned internal transcribed spacer (ITS) and sequences of the chloroplast trnT-trnL and atpBrbcL regions to (i) assess the evolutionary origin of tetraploid C. stoebe s.l., and (ii) uncover the phylogeny of the C. stoebe group. Both issues have not been studied so far and thus remained controversial.Cloned ITS sequences showed the presence of two slightly divergent ribotypes occurring in tetraploid cytotype, while only one major ribotype was present in diploid C. stoebe s.str. This pattern suggests an allopolyploid origin of tetraploids with contribution of the diploid C. stoebe s.str. genome. Although we were not able to detect the second parental taxon, we hypothesize that hybridization might have triggered important changes in morphology and life history traits, which in turn may explain the colonization success of the tetraploid taxon. Bayesian relaxed clock estimations indicate a relatively recent -Pleistocene origin of the tetraploid C. stoebe s.l. Furthermore, our analyses showed a deep split between the C. paniculata and C. stoebe groups, and a young diversification of the taxa within the C. stoebe group. In contrast to nrDNA analyses, the observed pattern based on two cpDNA regions was inconclusive with respect to the origin and phylogeny of the studied taxa, most likely due to shared ancient polymorphism and frequent homoplasies.

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Section: Its Variation and Phylogenetic Relationships Within And Betwsupporting

confidence: 92%

Section: Divergence Time Estimationcontrasting

confidence: 59%

Section: Haplotype Diversity Analysesmentioning

confidence: 67%

Section: Divergence Time Estimationmentioning

confidence: 99%

“…atlantica (Font Quer) Blanca and C. debdouensis Breitw. and Podlech has been explained by recent hybridization (Suárez-Santiago et al, 2007).…”

Section: Introductionmentioning

confidence: 98%

See 3 more Smart Citations

Allopolyploid origin of highly invasive Centaurea stoebe s.l. (Asteraceae)

Mráz

Garcia‐Jacas

Gex-Fabry

et al. 2012

Molecular Phylogenetics and Evolution

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Phylogeny and evolution of the Arctium‐Cousinia complex (Compositae, Cardueae‐Carduinae)

López-Vinyallonga

Mehregan

Garcia‐Jacas

et al. 2009

TAXON

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These authors contributed equally to this publicationThe phylogeny and evolution of the Arctium-Cousinia complex, including Arctium, Cousinia as one of the largest genera of Asteraceae, Hypacanthium and Schmalhausenia, is investigated. This group of genera has its highest diversity in the Irano-Turanian region and the mountains of Central Asia. We generated ITS and rpS4-trnT-trnL sequences for altogether 138 species, including 129 (of ca. 600) species of Cousinia. As found in previous analyses, Cousinia is not monophyletic. Instead, Cousinia subgg. Cynaroides and Hypacanthodes with together ca. 30 species are more closely related to Arctium, Hypacanthium and Schmalhausenia (Arctioid clade) than to subg. Cousinia (Cousinioid clade). The Arctioid and Cousiniod clades are also supported by pollen morphology and chromosome number as reported earlier. In the Arctioid clade, the distribution of morphological characters important for generic delimitation, mainly leaf shape and armature and morphology of involucral bracts, are highly incongruent with phylogenetic relationships as implied by the molecular data. No taxonomic solution for this conflict can be offered, and the characters named are interpreted as homoplasious. Although phylogenetic resolution in the Cousinioid clade is poor, our ITS and rpS4-trnT-trnL sequences contain some phylogenetic information. For example, the six annual species of the Cousinioid clade fall into two groups. Poor phylogenetic resolution probably results from lack of characters and the high number of taxa in this species-rich and comparatively young (ca. 8.7 mya) lineage. We hypothesize that speciation in the Cousinioid clade was mainly allopatric.

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Geographical speciation related to Pleistocene range shifts in the western Mediterranean mountains (Reseda sect. Glaucoreseda, Resedaceae)

Martín‐Bravo

Valcárcel

Vargas

et al. 2010

TAXON

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Reseda sect. Glaucoreseda is a monophyletic group composed of five endemic tetraploid species with a disjunct distribution in the high mountains and plateaus of the Iberian Peninsula and Morocco. It was previously suggested that range shifts induced by Quaternary glaciations played an important role in the speciation of the group. We studied the evolution of R. sect. Glaucoreseda in order to infer historical range dynamics and speciation processes, and to understand current distributional patterns. Phylogeographic analyses were performed using nuclear ribosomal ITS and plastid trnL-F and rps16 sequences. Cloning of additive ITS sequences was carried out to elucidate the origin of intra-individual polymorphisms. A dated phylogeny based on ITS and cpDNA (rbcL, matK, trnL-F) sequences was used to estimate divergence times of R. sect. Glaucoreseda. Time estimates using Penalized Likelihood analyses indicate a late Pleistocene diversification of R. sect. Glaucoreseda. Incomplete lineage sorting of ancestral polymorphisms due to recent divergence, rather than rampant hybridisation, is suggested as the main cause of the phylogenetic incongruence detected between nuclear and plastid datasets. Our results support the vicariance hypothesis for population disjunctions in the Iberian Peninsula, in which an ancestral, widespread species could have undergone differentiation by Quaternary interglacial fragmentation. In contrast, long-distance dispersal across the Strait of Gibraltar may have been involved in the colonisation of North African plateaus by R. battandieri.

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Reticulate evolution in the Acrolophus subgroup (Centaurea L., Compositae) from the western Mediterranean: Origin and diversification of section Willkommia Blanca

Cited by 59 publications

References 58 publications

Allopolyploid origin of highly invasive Centaurea stoebe s.l. (Asteraceae)

Allopolyploid origin of highly invasive Centaurea stoebe s.l. (Asteraceae)

Phylogeny and evolution of the Arctium‐Cousinia complex (Compositae, Cardueae‐Carduinae)

Geographical speciation related to Pleistocene range shifts in the western Mediterranean mountains (Reseda sect. Glaucoreseda, Resedaceae)

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