Different spore structures in sympatric Isoetes histrix populations and their relationship with gross morphology, chromosome number, and ribosomal nuclear ITS sequences

Flora ◽  
2011 ◽  
Vol 206 (5) ◽  
pp. 451-457 ◽  
Author(s):  
Simonetta Bagella ◽  
Maria Carmela Caria ◽  
Arántzau Molins ◽  
Josep Antoni Rosselló
Keyword(s):  
Chromosome Number ◽  
Its Sequences ◽  
Nuclear Its

scholarly journals Systematics of Scleranthus (Caryophyllaceae)

2021 ◽  
Author(s):  
◽  
Robin David Smissen
Keyword(s):  
Sequence Analysis ◽  
Dna Sequence ◽  
Dna Sequences ◽  
Sequence Divergence ◽  
Morphological Characters ◽  
Dna Sequence Analysis ◽  
Its Sequences ◽  
Data Sets ◽  
Nuclear Its ◽  
Floral Characters

<p>Scleranthus is a genus of about 12 species of herbaceous flowering plants or small shrubs with a disjunct Eurasian/Australasian distribution. Monophyly of the genus is supported by the close similarity of gynoecial development of all species and consistent with nuclear ITS DNA sequence analysis. Traditionally the genus had been divided into two sections, section Scleranthus and section Mniarum. Section Mniarum is exclusively Australasian while section Scleranthus has been circumscribed to contain exclusively European species or a combination of European and Australasian species. Pollen and floral characters align the species into Australasian and Eurasian groups also supported by nuclear ITS DNA sequence analysis. Section Scleranthus as more broadly defined (i.e., sensu West and Garnock-Jones, 1986) is therefore at least paraphyletic or at worst polypyhyletic. Phylogenetic reconstructions based on morphological characters differ from those based on ITS sequences in supporting different relationships within the Australasian species of Scleranthus. Hybridisation and introgression within the genus are discussed and suggested as the cause of discordance between morphology and DNA sequence based trees. Low sequence divergence among Scleranthus ITS sequences suggests that the European and Australasian clades within the genus diverged within the last l0 million years. Biogeographic implications of these dating and competing hypotheses explaining the disjunct North-South distribution of the genus are discussed. Nuclear ITS and chloroplast ndhF DNA sequences both suggest that Scleranthus belongs to a clade within the family Caryophyllaceae consisting of members of subfamilies Alsinoideae and Caryophylloideae. Phylogenetic relationships between genera belonging to the three subfamilies of Caryophyllaceae (Alsinoideae, Caryophyloideae, and Paronychioideae) are addressed in this thesis through ndhF sequence analysis, which provides no support for the monophyly of traditionally recognised groups. Morphological character data sets are likely to always encompass multiple incongruent data partitions (sensu Bull et al. 1993). It may therefore be appropriate to combine data from DNA sequence and morphology for parsimony analysis even where the two are significantly incongruent.</p>

scholarly journals Phylogeny of the tribe Aveneae (Pooideae, Poaceae) inferred from plastid trnT-F and nuclear ITS sequences

2007 ◽  
Vol 94 (9) ◽  
pp. 1554-1569 ◽  
Author(s):  
A. Quintanar ◽  
S. Castroviejo ◽  
P. Catalan
Keyword(s):  
Its Sequences ◽  
Nuclear Its

Phylogeographic divergences of nuclear ITS sequences in Coprinus species sensu lato

2001 ◽  
Vol 105 (12) ◽  
pp. 1519-1526 ◽  
Author(s):  
Kwan S. Ko ◽  
Young W. Lim ◽  
Yang H. Kim ◽  
Hack S. Jung
Keyword(s):  
Its Sequences ◽  
Nuclear Its

scholarly journals Systematics of Scleranthus (Caryophyllaceae)

2021 ◽  
Author(s):  
◽  
Robin David Smissen
Keyword(s):  
Sequence Analysis ◽  
Dna Sequence ◽  
Dna Sequences ◽  
Sequence Divergence ◽  
Morphological Characters ◽  
Dna Sequence Analysis ◽  
Its Sequences ◽  
Data Sets ◽  
Nuclear Its ◽  
Floral Characters

<p>Scleranthus is a genus of about 12 species of herbaceous flowering plants or small shrubs with a disjunct Eurasian/Australasian distribution. Monophyly of the genus is supported by the close similarity of gynoecial development of all species and consistent with nuclear ITS DNA sequence analysis. Traditionally the genus had been divided into two sections, section Scleranthus and section Mniarum. Section Mniarum is exclusively Australasian while section Scleranthus has been circumscribed to contain exclusively European species or a combination of European and Australasian species. Pollen and floral characters align the species into Australasian and Eurasian groups also supported by nuclear ITS DNA sequence analysis. Section Scleranthus as more broadly defined (i.e., sensu West and Garnock-Jones, 1986) is therefore at least paraphyletic or at worst polypyhyletic. Phylogenetic reconstructions based on morphological characters differ from those based on ITS sequences in supporting different relationships within the Australasian species of Scleranthus. Hybridisation and introgression within the genus are discussed and suggested as the cause of discordance between morphology and DNA sequence based trees. Low sequence divergence among Scleranthus ITS sequences suggests that the European and Australasian clades within the genus diverged within the last l0 million years. Biogeographic implications of these dating and competing hypotheses explaining the disjunct North-South distribution of the genus are discussed. Nuclear ITS and chloroplast ndhF DNA sequences both suggest that Scleranthus belongs to a clade within the family Caryophyllaceae consisting of members of subfamilies Alsinoideae and Caryophylloideae. Phylogenetic relationships between genera belonging to the three subfamilies of Caryophyllaceae (Alsinoideae, Caryophyloideae, and Paronychioideae) are addressed in this thesis through ndhF sequence analysis, which provides no support for the monophyly of traditionally recognised groups. Morphological character data sets are likely to always encompass multiple incongruent data partitions (sensu Bull et al. 1993). It may therefore be appropriate to combine data from DNA sequence and morphology for parsimony analysis even where the two are significantly incongruent.</p>

Phylogenetic insights into New World Cyperus (Cyperaceae) using nuclear ITS sequences

Brittonia ◽  
2014 ◽  
Vol 66 (3) ◽  
pp. 292-305 ◽  
Author(s):  
Christopher S. Reid ◽  
Richard Carter ◽  
Lowell E. Urbatsch
Keyword(s):  
New World ◽  
Its Sequences ◽  
Nuclear Its

Preliminary Studies on the Phylogeny ofOrthotrichum(Bryophyta) Inferred from Nuclear ITS Sequences

2009 ◽  
Vol 46 (6) ◽  
pp. 507-515 ◽  
Author(s):  
Jakub Sawicki ◽  
Vítězslav Plášek ◽  
Monika Szczecińska
Keyword(s):  
Its Sequences ◽  
Nuclear Its

scholarly journals Taxonomic Identity of Carpinus dayongina Franchet (Betulaceae)

PhytoKeys ◽  
2021 ◽  
Vol 177 ◽  
pp. 63-75
Author(s):  
Qianqian He ◽  
Runan Zhao ◽  
Anguo He ◽  
Zunling Zhu ◽  
Yihua Tong
Keyword(s):  
Its Sequences ◽  
Morphological Comparison ◽  
Separate Species ◽  
Flora Of China ◽  
Nuclear Its

Carpinus polyneura and C. dayongina are recognised as separate species in Flora of China. In this study, the results of an examination of literature, morphological comparison and phenetic clustering of nuclear ITS sequences suggest that C. dayongina is conspecific with C. polyneura. Thus, we propose reducing C. dayongina to a synonym of C. polyneura.

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