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- Jönsson, Jane, et al.
(författare)
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Ten polymorphic microsatellite markers for Hieracium s.s. (Asteraceae)
- 2010
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Ingår i: Conservation Genetics Resources. - : Springer Science and Business Media LLC. - 1877-7260 .- 1877-7252. ; 2:1, s. 295-300
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Tidskriftsartikel (refereegranskat)abstract
- Eight novel microsatellite markers were developed for Hieracium s.s. (excluding Pilosella) using a modified FIASCO protocol, and two out of nine microsatellites that were originally developed for Pilosella officinarum were optimised for Hieracium s.s.. All ten microsatellites consistently amplified loci from a wide range of representatives from north and central European species of various sections of the genus. When tested on 19 individuals, nine microsatellites were found to be highly polymorphic with 6–29 alleles, while one microsatellite marker was monomorphic. Cross-amplification showed that six of the ten microsatellites also amplified products in one taxon of Pilosella, P. floribunda × officinarum.
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| 2. |
- Tyler, Torbjörn, et al.
(författare)
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Patterns of plastid and nuclear variation among apomictic polyploids of Hieracium: evolutionary processes and taxonomic implications.
- 2013
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Ingår i: Annals of Botany. - : Oxford University Press (OUP). - 0305-7364 .- 1095-8290. ; 111:4, s. 591-609
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Tidskriftsartikel (refereegranskat)abstract
- Background and AimsApomictic species (with asexual seed production) make up for 20-50 % of all taxonomically recognized species in northern Europe, but the phylogenetic relationships of apomictic species and the mode of evolution and speciation remain largely unknown and their taxonomy is consequently disputed.MethodsIn the present study, plastid psbD-trnT sequences (349 accessions) and 12 nuclear microsatellite loci (478 accessions) were used to create an overview of the molecular variation in (mainly) northern European members of the most species-rich of all plant genera, Hieracium s.s. The results are discussed and interpreted in the context of morphological and cytological data on the same species.Key Results and ConclusionsThe complete psbD-trnT alignment was 1243 bp and 50 polymorphisms defined 40 haplotypes. All haplotypes found in the sections of the genus distributed in the northern European lowlands fell into one of two main groups, group H and group V, mutually separated by seven or eight polymorphisms. All accessions belonging to H. sects. Foliosa, Hieracioides (viz. H. umbellatum) and Tridentata and all but one accession of triploid species of H. sects. Oradea and Vulgata showed haplotypes of group V. Haplotypes of group H were found in all accessions of H. sects. Bifida and Hieracium and in all tetraploid representatives of H. sects. Oreadea and Vulgata. Additional haplotypes were found in accessions of the genus Pilosella and in southern European and Alpine sections of Hieracium. In contrast, the distribution of individual haplotypes in the two major groups appeared uncorrelated with morphology and current taxonomy, but polymorphisms within species were only rarely encountered. In total, 160 microsatellite alleles were identified. Levels of variation were generally high with only nine pairs of accessions being identical at all loci (in all cases representing accessions of the same species). In the neighbor-joining analysis based on the microsatellite data, accessions of the same species generally clustered together and some smaller groups of species congruent with morphology and/or current taxonomy were recovered but, except for H. sect. Oreadea, most larger groups were not correlated with morphology. Although the plastid DNA sequences show too little variation and the nuclear microsatellites are too variable to resolve relationships successfully among species or to fully understand processes of evolution, it is concluded that both species and sections as defined by morphology are largely congruent with the molecular data, that gene flow between the sections is rare or non-existent and that the tetraploid species may constitute the key to understanding evolution and speciation in this genus.
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| 3. |
- Hallingbäck, Tomas, et al.
(författare)
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Mossfloran på Ölands alvar – ett nytt inventeringsprojekt.
- 2012
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Ingår i: Myrinia – Föreningen Mossornas Vänners tidskrift. - 1102-4194. ; 22:1, s. 6-11
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Tidskriftsartikel (refereegranskat)abstract
- In 2011 a field survey of the bryophyte vegetation and flora of Stora Alvaret, the largest continuous alvar area in Sweden situated on the Baltic island of Öland (SE Sweden), was initiated. A number of transects crossing the alvar area from west to east will be surveyed. The aim of the investigation is to try and elucidate the realtionship between the bryophyte flora and environmental parameters such as soil chemistry, soil wetness, soil depth, disturbances from livestock grazing and the geographic position on the island at different spatial and temporal scales. The survey will be conducted both in early spring and late autumn and will run for several years to enable analyses of the impact of season and climatic variations.
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| 4. |
- Tyler, Torbjörn
(författare)
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A revision of Hieracium (Asteraceae) in Norrbotten, northeastern-most Sweden, revealed seven new species
- 2010
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Ingår i: Nordic Journal of Botany. - : Wiley. - 0107-055X. ; 28:5, s. 541-560
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Tidskriftsartikel (refereegranskat)abstract
- The large quantity of material of Hieracium sectt. Hieracium, Vulgata, Bifida and Oreadea collected during the recently completed floristic inventory of the northeastern most Swedish province of Norrbotten has been revised. The number of species known from this previously badly under-collected province hereby increased from 27 to 64, and seven species new to science were revealed. A diagnostic key to all 64 species is provided and H. alces T. Tyler, H. hystrix T. Tyler, H. larsii-levii T. Tyler, H. pseudopsepharum T. Tyler, H. stenbergii T. Tyler, H. taedum T. Tyler and H. vexillatum T. Tyler are described anew.
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| 10. |
- Tyler, Torbjörn
(författare)
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Critical notes on species of Hieracium (Asteraceae) reported as common to Sweden and Britain.
- 2014
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Ingår i: New Journal of Botany. - 2042-3489. ; 4:1, s. 25-32
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Tidskriftsartikel (refereegranskat)abstract
- All species of Hieracium sectt. Hieracium, Vulgata (incl. Bifida) and Oreadea originally described from the Nordic countries, but reported in recent accounts as occuring in the British Isles, have been scrutinised based on specimens and published descriptions. Out of 29 species stated as occurring in Britain and native to Fennoscandia, only four are confirmed (H. caesiomurorum, H. oistophyllum, H. pellucidum and H. triviale). These are all species with wide distributions in Fennoscandia and northern Europe and their occurence in Britain is thus not surprising. In addition, the first British occurrence of the widespread European species H. neopinnatifidum is reported. Apart from the above four, H. caesitium, H. diaphanoides and H. austrinum (H. scanicum) are possibly also native to both areas, although the material examined is not fully conclusive. In addition, at least a few species occur as aliens in both Sweden and Britain, but a further twelve need to be critically compared. Most of the Nordic names used for British plants are found to be based on misidentifications and the species concerned will have to be described and named anew. It is concluded that it is not good practice to borrow names of Hieracium species from distant areas without critically comparing types, authentic specimens and relevant literature. Only a very few species of this genus have distributions that stretch into several countries or across major water bodies.
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