Phylogenetic relationships ofAristidaand relatives (Poaceae, Aristidoideae) based on noncoding chloroplast (trnL-F,rpl16) and nuclear (ITS) DNA sequences

AbstractThe taxonomic and phylogenetic relationships within the genus Artemisia s.l. (Asteraceae) are controversial, and it has been considered 1 to 8 different genera. This work re-investigated the phylogenetic relationships in Artemisia using nuclear ribosomal (ITS) and chloroplast psbA-trnH DNA sequences using three sections of Artemisia, Dracunculus, and Serphidium. Three phylogenetic trees were conducted separately on the basis of ITS, psbA-trnH and combined sequences using maximum parsimony. The results showed that the three sections were clearly separated from each other, and that the heterogamous Dracunculus and Artemisia are closely related to each other than either to homogamous Serphidium. This may suggest the taxonomic importance of capitulum morphology in Artemisia s.l. Our data also cast doubt on the use of cytogenetic similarity e.g., basic chromosome number in grouping Serphidium and Artemisia s.s. Furthermore, AMOVA analysis showed a higher level of ITS (55.29%) and combined ITS+cppsbA-trnH (55.63%) variations among sections. This provides further evidence for separation of these three sections and supports the phylogenetic results. The higher ITS nucleotide differences detected in Artemisia (30.4737) compared to very low value in Dracunculus (2.3333) and Serphidium (1.23077) may propose that the Artemisia comprises of several incipient sections. This supports the previous suggestion that Artemisia is a complex group.

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Phylogenetic relationships in the tribe Alysseae (Brassicaceae) based on nuclear ribosomal ITS DNA sequences

Botany ◽

10.1139/b08-013 ◽

2008 ◽

Vol 86 (4) ◽

pp. 315-336 ◽

Cited By ~ 45

Author(s):

Suzanne I. Warwick ◽

Connie A. Sauder ◽

Ihsan A. Al-Shehbaz

Keyword(s):

Maximum Likelihood ◽

Dna Sequences ◽

Phylogenetic Relationships ◽

Maximum Parsimony ◽

Internal Transcribed Spacer ◽

Sequence Data ◽

Its Region ◽

Morphological Characters ◽

Data Support ◽

Its Dna Sequences

Sequence data from the nuclear ribosomal internal transcribed spacer (ITS) region of 85 species (131 accessions) were used to determine the tribal limits, monophyly status, and phylogenetic intra-tribal relationships of genera within the tribe Alysseae (Brassicaceae). Both maximum parsimony and maximum likelihood analyses support the recognition of the tribe Alysseae s. str. (12 genera: Alyssoides , Alyssum , Aurinia , Berteroa , Bornmuellera , Clastopus , Clypeola , Degenia , Fibigia , Galitzkya , Hormathophylla , and Physoptychis ). Six well-supported clades were recognized within the Alysseae clade, including two Alyssum clades (one of which includes Clypeola ), an Alyssoides and allies clade (includes Alyssoides , Bornmuellera , Clastopus , Degenia , Fibigia , Hormathophylla , and Physoptychis ), a Berteroa and allies clade (includes Aurinia , Berteroa , and Galitzkya ), a Bornmuellera clade, and a Hormathophylla clade. Morphological and cytological support for these clades is reviewed. The ITS data support the exclusion of the following taxa from the Alysseae, with appropriate tribal assignment given in parentheses: Alyssum klimesii Al-Shehbaz (Camelineae), Asperuginoides (unresolved), Athysanus (Arabideae), Botschantzevia (Arabideae), Didymophysa (unresolved), Farsetia (Malcolmieae), Lobularia (Malcolmieae), and Ptilotrichum (Arabideae). Farsetia and Lobularia are inferred to be monophyletic, and based on molecular and morphological characters they are assigned to Malcolmieae, a recently described tribe.

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A new species of Saxifraga in section Ciliatae subsection Gemmiparae (Saxifragaceae) from Sichuan province, China

Phytotaxa ◽

10.11646/phytotaxa.333.2.6 ◽

2018 ◽

Vol 333 (2) ◽

pp. 228

Author(s):

QINGBO GAO ◽

ZHUOXIN ZHANG ◽

SHILONG CHEN ◽

RICHARD J. GORNALL

Keyword(s):

New Species ◽

Dna Sequences ◽

Sichuan Province ◽

Molecular Evidence ◽

Evidence Based ◽

Western Sichuan ◽

Nuclear Its ◽

Its Dna Sequences ◽

Pale Green ◽

A New Species

Saxifraga viridipetala Z-X. Zhang & Gornall (Saxifragaceae) is described as a new species. Originating from south-western Sichuan province in China, morphological and molecular evidence (based on chloroplast trnL-F and nuclear ITS DNA sequences) indicate that S. viridipetala is closely related to S. gemmipara, in section Ciliatae. The new species can be diagnosed by its narrowly elliptic, pale green petals spotted purple in the proximal 4/5 part.

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