| 1. |
- Aagaard, Sunniva M.D. 1977-, et al.
(författare)
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Resolving maternal relationships in the clubmoss genus Diphasiastrum (Lycopodiaceae)
- 2009
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Ingår i: Taxon. - 0040-0262 .- 1996-8175. ; 58:3, s. 835-848
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Tidskriftsartikel (refereegranskat)abstract
- Diphasiastrum comprises 20-30 species. In addition to a number of species with a circumboreal distribution, several island endemics and putative diploid hybrid species contribute to the diversity of the group. To assess the integrity and relationships of the recognized species, a global phylogeny of Diphasiastrum is constructed using five chloroplast regions comprising ~9000 bp. Six monophyletic groups are identified. Accessions identified as hybrid species cluster in all but one case together with one of its putative parents. Two microsatellite loci are identified, and allelic information combined with sequence information is found diagnostic for the three putative parental taxa in the Central Europe hybrid complexes. Haplotype screening is performed on six Central European populations, from where one or more putative diploid hybrid species have been reported to grow in sympatry with their parent species. The most common parental haplotypes are identified in all populations. Additional intraspecific variation, restricted to single populations, is identified in all sympatric populations at very low frequencies. Taking the low degree of sequence and microsatellite variation into consideration, the acknowledged morphological diversity in Central Europe is probably best explained by phenotypic plasticity, ancestral polymorphisms or relatively recent events of reticulate evolution.
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| 2. |
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| 3. |
- Anderberg, A. A., et al.
(författare)
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Maesaceae, a new primuloid family in the order Ericales s.l.
- 2000
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Ingår i: Taxon. - Vienna, Austria : IAPT. - 0040-0262 .- 1996-8175. ; 49:2, s. 183-187
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Tidskriftsartikel (refereegranskat)abstract
- Evidence from morphology and molecular sequence data from three chloroplast genes, rbcL, ndhF, and atpB, have shown that the genus Maesa constitutes an evolutionary lineage separate from the other three primuloid families, Theophrastaceae, Myrsinaceae, and Primulaceae. The new family Maesaceae is here formally recognised, its taxonomic status being changed from a subfamily of Myrsinaceae. The new family comprises a single genus, Maesa Forssk., with some 100 species of trees or shrubs; it is diagnosed by characters such as flower pedicels with two bracteoles, a semi-inferior ovary, and indehiscent fruits with many seeds. A key to the major groups of primuloid taxa is presented.
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| 4. |
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| 5. |
- Anderson, Heidi, et al.
(författare)
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(087–090) Proposal to treat the use of a hyphen in the name of a fossil-genus as an orthographical error
- 2015
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Ingår i: Taxon. - : International Association for Plant Taxonomy. - 0040-0262 .- 1996-8175.
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Tidskriftsartikel (refereegranskat)abstract
- We propose modifications to the Code such that use of a hyphen in the name of a fossil-genus is treated as an error to be corrected by deletion of the hyphen. This will circumvent the need to conserve the numerous de-hyphenated names against unused hyphenated forms. We propose changes to Art. 60 of the Code to allow this correction, and the addition of a phrase in Art. 20 to add clarity to the naming of fossil-genera.
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| 6. |
- Andersson, Lennart, 1948, et al.
(författare)
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Phylogeny of the tribe Cinchoneae (Rubiaceae), its position in Cinchonoideae, and description of a new genus, Ciliosemina
- 2005
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Ingår i: Taxon. - 0040-0262. ; 54:1, s. 17-28
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Tidskriftsartikel (refereegranskat)abstract
- Relationships of and within the Rubiaceae tribe Cinchoneae were estimated based on DNA sequence variation in five loci: the ITS region, the matK and rbcL genes, the rps16 intron, and the trnL-F region including the trnL intron and the trnL-F intergenic spacer. Within Cinchonoideae s.s., the tribe Naucleeae is the sister group of a clade that comprises all other taxa. Cinchoneae and Isertieae s.s., are strongly supported as sister groups. The tribe Cinchoneae is strongly supported as monophyletic in a restricted sense, including the genera Cinchona, Cinchonopsis, Joosia, Ladenbergia, Remijia and Stilpnophyllum. There is strong support that these genera are monophyletic as presently conceived, except that one species mostly referred to Remijia is of uncertain phylogenetic affinity. To accommodate this species and a morphologically closely similar one, a new genus, Ciliosemina A. Antonelli, is proposed and two new combinations are made.
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| 7. |
- Andersson, Lennart, 1948, et al.
(författare)
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Relationships of the genus Azorella (Apiaceae) and other hydrocotyloids inferred from sequence variation in three plastid markers
- 2006
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Ingår i: Taxon. - 0040-0262. ; 55:2, s. 270-280
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Tidskriftsartikel (refereegranskat)abstract
- Relationships of genera traditionally referred to the subfamily Hydrocotyloideae (Apiaceae), with emphasis on Azorella, were estimated using sequence variation in the markers matK, rbcL, and rps 16. The analyses were based on a combined dataset comprising 66 taxa represented by 134 sequences (29 matK, 40 rbcL, and 65 rps 16) as well as partial datasets constructed from individual markers and combinations of them. The results confirm previous observations that the hydrocotyloids are an unnatural assemblage of taxa from at least four different groups, of which one belongs to Araliaceae and the remaining ones to Apiaceae. The recently recognized subfamilies Mackinlayoideae and Azorelloideae are supported, with the possible exclusion of Platysace from the former and the addition of Asteriscium, Diposis, Domeykoa, Drusa, Homalocarpus, Laretia, Oschatzia, and Pozoa to the latter. Within Azorelloideae, the Azorella, Bowlesia, and Asteriscium clades are identified, although relationships among them are obscure. The genus Azorella occurs in two subclades that also include other genera, and is obviously paraphyletic as presently conceived. The Azorella sections Cirrhosae and Ciliatae are probably also paraphyletic.
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| 8. |
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| 9. |
- Andreasen, Katarina, et al.
(författare)
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Genetic identity of putative Linnaean plants : Successful DNA amplification of Linnaeus's crab apple Malus baccata
- 2014
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Ingår i: Taxon. - : Wiley. - 0040-0262 .- 1996-8175. ; 63:2, s. 408-416
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Advancements in molecular techniques enable us to extract DNA from historic herbarium specimens and facilitate genetic comparisons between herbarium material and living plant collections. These recent advances offer an exciting opportunity for identifying extant Linnaean plants by genetic comparisons of Linnaeus's own herbarium specimens with potentially remnant plants from his cultivations. DNA from the lectotype of Malus baccata (L.) Borkh. in the Linnaean Herbarium was successfully extracted and amplified for five of twelve loci of microsatellites. Results of genetic comparisons with M. baccata trees from Linnaeus's Hammarby, Sweden, show that the trees at Hammarby are closely related to each other, but not to the lectotype, which is closer to material from Russia. This suggests that Linnaeus received M. baccata from more than one source. Although not close to the lectotype and not represented by a specimen in the Linnaean Herbarium, the extant M. baccata at Hammarby may still represent Linnaean plants, that were grown by Linnaeus himself, or the descendants to such plants. Future studies on the almost 50 living, potential Linnaean plants may reveal an invaluable biological, scientific and cultural heritage from the era that saw the rise of systematic biology.
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| 10. |
- Andreasen, Katarina, et al.
(författare)
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Successful DNA amplification of a more than 200-year-old herbarium specimen : recovering genetic material from the Linnaean era
- 2009
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Ingår i: Taxon. - 0040-0262 .- 1996-8175. ; 58:3, s. 959-962
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Tidskriftsartikel (refereegranskat)abstract
- The limit for successful DNA extraction was tested by amplification and sequencing of an over 200-year-old herbarium specimen collected by Adam Afzelius, a student of Carl Linnaeus. We amplified and sequenced a 800-bp region between 16S ribosomal DNA and the 3′ part of the trnI gene (16S-trnI) in the chloroplast genomeof Phaulopsis talbotii S. Moore (Acanthaceae). To test the replicability and to control for contamination the procedure was performed in sealed vials and with negative PCR controls. The procedure was also repeated in a separate laboratory. In addition, the chloroplast rpl16 intron was successfully amplified and sequenced and the rps16 intron amplified. Sequences of taxa closely related to Acanthaceae were found to be most similar to the produced sequences. The results suggest that molecular investigations of other 18th century botanical collections are feasible and that molecular methods could be employed for comparative studies to extant plant collections. An important application would be to identify descendants or clones of Linnaean lectotypes by comparing DNA from these with potentially remnant plants from Linnaeus’ cultivations.
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