Conservation of Britain's biodiversity: the case of Hieracium cyathis (Asteraceae) and its relation to other apomictic taxa

Rich, Tim C. G.; McDonnell, Elizabeth; Lledó, M. Dolores

doi:10.1111/j.1095-8339.2007.00747.x

Cited by 19 publications

(18 citation statements)

References 20 publications

(25 reference statements)

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“…This indicates that triploid H. alpinum is not completely male sterile, as previously suggested. Intraspecific polymorphism in pollen production has also been reported in other polyploid Hieracium taxa (Mráz 2002;Kovalčiková 2004;Slade and Rich 2007;Rich et al 2008). Interestingly, in some cases we recorded variation in pollen production within one flower head, or even within one flower (some anthers with pollen, some anthers completely empty).…”

Section: Variation In Pollen Productionmentioning

confidence: 73%

Geographical parthenogenesis, genome size variation and pollen production in the arctic-alpine species Hieracium alpinum

2009

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Hieracium alpinum L. (Asteraceae) is an arcticalpine species distributed throughout Europe with both diploid and triploid cytotypes. We determined the ploidy levels of plants from 23 populations from Austria, Bosnia and Herzegovina, Finland, Italy, Norway, Romania, Slovakia, Switzerland and Ukraine. Data showed a nonoverlapping pattern of cytotype distribution: sexually reproducing diploids (2n = 2x = 18) occur solely in the Eastern and Southern Carpathians, while apomictic triploids (2n = 3x = 27) cover the rest of the range. Such clear-cut allopatry is rather rare in vascular plants with geographical parthenogenesis. Comparison of absolute genome size indicates genome downsizing (by on average 3.7%) of haploid DNA amount in triploids relative to diploids. Genome size further correlated with longitude and latitude in the Alps, with decreasing absolute DNA content from west to east, and from south to north. While previously published data indicated complete male sterility of triploid plants, we found that plants from the Alps and Bosnia and Herzegovina commonly produced some pollen, whereas populations from the Western Carpathians and Scandinavia seemed to be almost completely pollen sterile. Scenarios about the evolution of geographical parthenogenesis in H. alpinum are discussed.

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Section: Variation In Pollen Productionmentioning

confidence: 73%

Geographical parthenogenesis, genome size variation and pollen production in the arctic-alpine species Hieracium alpinum

2009

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“…Cernua has been shown by Ronikier and Szeląg (2008). The AFLPs have been applied also in rare H. cyathis and closely related taxa in order to test the genetic integrity of this species (Rich et al 2008). Here we demonstrate the usefulness of amplified fragment length polymorphism also for the detection of interspecific Hieracium hybrids.…”

Section: Molecular Evidence For Hybrid Originmentioning

confidence: 99%

Interspecific hybridization in the genus Hieracium s. str.: evidence for bidirectional gene flow and spontaneous allopolyploidization

2011

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Although reticulation has indisputably played an important role in the evolutionary history of the genus Hieracium s. str. (Asteraceae), convincingly documented cases of recent interspecific hybridization are very rare. Here we report combined evidence on recent hybridization between two diploid species, Hieracium alpinum and H. transsilvanicum. The hybrid origin of the plants from the Romanian Eastern Carpathians was supported by additive patterns of nuclear ribosomal DNA polymorphism (ITS), an intermediate position of hybrid plants in principal coordinate analysis based on amplified fragment length polymorphism phenotypes (AFLP), and additivity at one allozyme locus. Flow cytometric analyses and chromosome counting showed that two hybrids were diploid (2n * 2x * 18) while one was surprisingly tetraploid (2n = 4x = 36). To our knowledge, this is the first record of spontaneous polyploidization following interspecific crossing in the genus. Allozyme data, especially the presence of unbalanced heterozygosity at one locus, suggest the origin of this tetraploid via a triploid bridge with subsequent backcrossing to H. alpinum. According to PCR-RFLP analyses of the trnT-trnL intergenic spacer, all H. 9krasani hybrids examined had the H. alpinum haplotype while H. transsilvanicum served as a pollen donor. The hybrids occurred at the locality with abundant H. alpinum plants where paternal H. transsilvanicum was missing. Previously reported instances of interspecific hybridization between the same parental taxa showed an opposite direction of crossing and relative abundance of parental taxa. This suggests that the direction of hybridization might be influenced by the frequency of parental taxa at the locality.

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“…In a more recent study on H. cyathis using amplified fragment length polymorphism (AFLP), it was demonstrated that the apomictic species was distinct at the molecular level. However, the study also revealed considerable genetic variation within the species, as every individual had a unique genotype (Rich, McDonell & LLedó, ).…”

Section: Introductionmentioning

confidence: 99%

Genetic structure of the rare and endangeredHieracium wiesbaurianumgroup (Asteraceae) in Bavaria

et al. 2014

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The rare and endangered Hieracium wiesbaurianum species group shows a scattered relictual distribution in Bavaria. Recently, a couple of populations were discovered which clearly differ from all other populations. If these must be considered as taxonomically independent units, they would be of crucial conservation interest, because of the sole responsibility that Bavaria has for these worldwide endemics. We therefore analysed the genetic structure of H. wiesbaurianum in a comparative approach. Our analysis comprised 37 populations of 13 taxa of H. wiesbaurianum, H. bifidum and H. laevigatum, including three potentially new taxa. We applied amplified fragment length polymorphism (AFLP) analysis and observed only limited genetic variation within populations and taxa. Nevertheless, each studied individual exhibited a unique genotype. An analysis of molecular variance revealed high levels of genetic variation between taxa, but populations were genetically less different. The clear genetic differentiation between the studied taxa was supported by neighbor‐joining cluster analyses and principal coordinate analyses in which every individual was clearly assigned to its respective taxon. The three potentially new taxa were genetically as well differentiated as the other taxa included in our study. This supports the assumption that they should be treated as taxonomically independent units of high conservation interest. Therefore, the genetic analysis confirmed the morphologically based classification of the studied Hieracium taxa. © 2014 The Linnean Society of London, Botanical Journal of the Linnean Society, 2015, 177, 112–123.

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Conservation of Britain's biodiversity: the case of Hieracium cyathis (Asteraceae) and its relation to other apomictic taxa

Cited by 19 publications

References 20 publications

Geographical parthenogenesis, genome size variation and pollen production in the arctic-alpine species Hieracium alpinum

Geographical parthenogenesis, genome size variation and pollen production in the arctic-alpine species Hieracium alpinum

Interspecific hybridization in the genus Hieracium s. str.: evidence for bidirectional gene flow and spontaneous allopolyploidization

Genetic structure of the rare and endangeredHieracium wiesbaurianumgroup (Asteraceae) in Bavaria

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