ITS sequences from nuclear rDNA suggest unexpected phylogenetic relationships between Euro-Mediterranean, East Asiatic and North American taxa ofQuercus (Fagaceae)

Samuel, Rosabelle; Bachmair, Andreas; Jobst, Jürgen; Ehrendorfer, Friedrich

doi:10.1007/bf00984917

Cited by 35 publications

(52 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These values Wt within the known ranges for Xowering plants, as reported in Baldwin et al (1995) and are very similar to those detected in Quercus spp. by Manos et al (1999) but not to those obtained by other research groups (Muir et al, 2001;Samuel et al, 1998; data not shown).…”

Section: Its Sequence Analysismentioning

confidence: 68%

“…Muir et al, 2001;Samuel et al, 1998) allowed us to recover single clear-cut bands of ca. 600 bp from all the Quercus taxa.…”

Section: Its Sequence Analysismentioning

confidence: 99%

“…Mayol and Rossellò (2001) compared the two ITS data sets and detected high levels of variation in the G + C content, as well as large indels responsible for length variation, high rates of substitution in the conserved motifs and diVering secondary structures stability. The convincing explanation proposed for the contrasting phylogenetic history derived by Samuel et al (1998) was that it was generated by a spurious analysis, where some species were represented by ITS pseudogene sequences and only a few by functional orthologues. More recently, the potential risk of mixing data from the contemporary analysis of unnoticed divergent paralogues was also underlined by the study of Muir et al (2001), who detected three divergent rDNA clusters in Q. robur and Q. petraea, based on 5.8S and ITS2 sequences.…”

Section: Introductionmentioning

confidence: 99%

“…Their reconstructions, however, showed disagreements in aspects, although the phylogenetic trees for both hypotheses were strongly supported by bootstrap resampling. In particular, the maximum parsimony tree derived by Samuel et al (1998) conXicted with available infrageneric Quercus classiWcations (mostly those concerned with sections Cerris and Quercus) and documented polyphyletic lines for sect. Cerris, thus suggesting Tertiary transcontinental connections between eastern Asia and North America.…”

Section: Introductionmentioning

confidence: 99%

“…Bellarosa et al, 1990Bellarosa et al, , 1996Toumi and Lumaret, 2001), and deWne the geographic structure of genetic diversity and post-glacial recolonisation routes (Ferris et al, 1993;Fineschi et al, 2002;Petit et al, 2002bPetit et al, , 1997 in oaks. Recently, two research teams (Manos et al, 1999;Samuel et al, 1998) attempted to assess the molecular systematics of Quercus using independently generated sequence data of the internal transcribed spacer (ITS) regions. Their reconstructions, however, showed disagreements in aspects, although the phylogenetic trees for both hypotheses were strongly supported by bootstrap resampling.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Utility of ITS sequence data for phylogenetic reconstruction of Italian Quercus spp.

Bellarosa

Simeone

Papini

et al. 2005

Molecular Phylogenetics and Evolution

View full text Add to dashboard Cite

Nuclear ribosomal DNA sequences encoding the 5.8S RNA and the Xanking internal transcribed spacers (ITS1 and ITS2) were used to test the phylogenetic relationships within 12 Italian Quercus taxa (Fagaceae). Hypotheses of sequence orthology are tested by detailed inspection of some basic features of oak ITS sequences (i.e., general patterns of conserved domains, thermodynamic stability and predicted conformation of the secondary structure of transcripts) that also allowed more accurate sequence alignment. Analysis of ITS variation supported three monophyletic groups, corresponding to subg. Cerris, Schlerophyllodrys ( D Ilex group sensu Nixon) and Quercus, as proposed by Schwarz [Feddes Rep., Sonderbeih. D,. A derivation of the "Cerris group" from the "Ilex group" is suggested, with Q. cerris sister to the rest of the "Cerris group." Quercus pubescens was found to be sister to the rest of the "Quercus group." The status of hybrispecies of Q. crenata (Q. cerris £ Q. suber) and Q. morisii (Q. ilex £ Q. suber) was evaluated and discussed. Finally, the phylogenetic position of the Italian species in a broader context of the genus is presented. The utility of the ITS marker to assess the molecular systematics of oaks is therefore conWrmed. The importance of Italy as a region with a high degree of diversity at the population and genetic level is discussed. 

show abstract

Section: Its Sequence Analysismentioning

confidence: 68%

“…Muir et al, 2001;Samuel et al, 1998) allowed us to recover single clear-cut bands of ca. 600 bp from all the Quercus taxa.…”

Section: Its Sequence Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Utility of ITS sequence data for phylogenetic reconstruction of Italian Quercus spp.

Bellarosa

Simeone

Papini

et al. 2005

Molecular Phylogenetics and Evolution

View full text Add to dashboard Cite

show abstract

The oaks of western Eurasia: Traditional classifications and evidence from two nuclear markers

Denk

Grimm

2010

TAXON

181

212

View full text Add to dashboard Cite

Phylogenetic relationships among species of Quercus (oaks) from western Eurasia including the western part of the Himalayas are examined for the first time. Based on ITS and 5S–IGS data three major infrageneric groups are recognized for western Eurasia: the cerroid, iliciod, and roburoid oaks. While individuals of the cerroid and ilicoid groups cluster according to their species, particularly in the 5S–IGS analyses, individuals of species of roburoid oaks do not cluster with exception of Quercus pontica. The Cypriot endemic Quercus alnifolia belongs to the ilicoid oaks, in contrast to traditional views placing it within the cerroid oaks. Based on all ITS data available, the groups identified for western Eurasia can be integrated into a global infrageneric framework for Quercus. The Ilex group is resurrected as a well–defined group that comprises taxa traditionally placed into six subsections of Q. sects. Cerris and Lepidobalanus (white oaks) sensu Camus. Phylogenetic reconstructions suggest two major lineages within Quercus, each consisting of three infrageneric groups. Within the first lineage, the Quercus group (roburoid oaks in western Eurasia) and the Lobatae group evolved by “budding” as is reflected by incomplete lineage sorting, high variability within groups, and low differentiation among groups. The groups of the second lineage, including the Cyclobalanopsis, Cerris (cerroid oaks in western Eurasia), and Ilex (ilicoid oaks in western Eurasia) groups, evolved in a more tree–like fashion.

show abstract

Generic Delimitation and Phylogeny of the Subtribe Centaureinae (Asteraceae): A Combined Nuclear and Chloroplast DNA Analysis

et al. 2001

View full text Add to dashboard Cite

Taxonomic complexity has hindered the partitioning of the arti®cial genus Centaurea, even though it has long been recognized as a polyphyletic assemblage. On the basis of morphology, pollen type, karyology and DNA sequence analysis, previous workers have de®ned ®ve informal groups in the genus (Acrocentron, Centaurea sensu stricto, Cyanus, Jacea and Psephellus). However, the precise delimitation of these groups and their relationships remain largely unknown. Moreover, although some informal groups have been established among the rest of the subtribe (Amberboa, Carthamus and Stemmacantha), many genera cannot be classi®ed in any group. Newer molecular approaches are essential for resolving these problems. Sequences of the internal transcribed spacers (ITS) of nuclear ribosomal DNA and the chloroplast gene matK were analysed for a comprehensive sample of the whole subtribe, with the aim of clarifying the delimitation and the phylogeny of the groups of the Centaureinae. Results largely con®rm the suggested informal entities as natural groups, with some interesting changes of placement of some genera, especially in the Acrocentron and the Stemmacantha groups. Our results con®rm that the sections of Centaurea with Dealbata pollen type should be classi®ed as a dierent genus, Psephellus. In addition to morphology and suggested pollen type evolution, the ITS and matK phylogenies are also supported by karyological evidence. Our results con®rm that the natural delimitation of Centaurea that minimizes nomenclatural changes is possible only if a new type of the genus is designated.

show abstract

ITS sequences from nuclear rDNA suggest unexpected phylogenetic relationships between Euro-Mediterranean, East Asiatic and North American taxa ofQuercus (Fagaceae)

Cited by 35 publications

References 17 publications

Utility of ITS sequence data for phylogenetic reconstruction of Italian Quercus spp.

Utility of ITS sequence data for phylogenetic reconstruction of Italian Quercus spp.

The oaks of western Eurasia: Traditional classifications and evidence from two nuclear markers

Generic Delimitation and Phylogeny of the Subtribe Centaureinae (Asteraceae): A Combined Nuclear and Chloroplast DNA Analysis

Contact Info

Product

Resources

About