| 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. |
- 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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| 7. |
- 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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| 8. |
- Applequist, Wendy L., et al.
(författare)
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Apportionment of institutional votes for the Nomenclature Section : A rebuttal to Smith & al.
- 2010
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Ingår i: Taxon. - 0040-0262 .- 1996-8175. ; 59:5, s. 1567-1570
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Tidskriftsartikel (refereegranskat)abstract
- Smith & al. (2010) have suggested that the apportionment of institutional votes for the Nomenclature Section of the International Botanical Congress based upon taxonomic activity represents a "colonial legacy" that disadvantages developing nations, and that institutional votes should instead be distributed based at least in part upon a country's human population and the size of its flora. While we agree that increasing participation by developing-country taxonomists is an important goal, we believe that Smith & al. fail to support their claim that the current practice of plant nomenclature is harmful to developing nations. No evidence has been offered of regional biases regarding proposals to change the wording of the Code, which represent the vast majority of the votes taken at any Nomenclature Section, nor has the current process of apportionment of institutional votes been shown to be biased. The reform measures proposed by Smith & al. would, as we show, introduce explicit discrimination based on nationality into the International code of botanical nomenclature, undermining the international cooperation among taxonomists that is necessary for the smooth functioning of a universally accepted system of nomenclature. Rather than making hasty and perhaps harmful changes to the current means of voting, we suggest that the international taxonomic community should consider carefully what measures will best facilitate participation without creating new sources of injustice.
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| 9. |
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| 10. |
- Backlund, Anders, et al.
(författare)
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Diervillaceae and Linnaeaceae, two new families of caprifolioids
- 1998
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Ingår i: Taxon. - : INT ASSOC PLANT TAXONOMY. - 0040-0262 .- 1996-8175. ; 47:3, s. 657-661
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Tidskriftsartikel (refereegranskat)abstract
- Two new families of caprifolioids, Diervillaceae and Linnaeaceae, are proposed. They correspond to the former subfamilies Diervilloideae and Linnaeoideae. A key to their genera and those remaining in Caprifoliaceae is provided.
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