Hörandl, Elvira

[["dc.bibliographiccitation.artnumber","20161221"],["dc.bibliographiccitation.issue","1838"],["dc.bibliographiccitation.journal","Proceedings of The Royal Society B Biological Sciences"],["dc.bibliographiccitation.volume","283"],["dc.contributor.author","Mirzaghaderi, Ghader"],["dc.contributor.author","Hoerandl, Elvira"],["dc.date.accessioned","2018-11-07T10:08:32Z"],["dc.date.available","2018-11-07T10:08:32Z"],["dc.date.issued","2016"],["dc.description.abstract","Meiosis is an ancestral, highly conserved process in eukaryotic life cycles, and for all eukaryotes the shared component of sexual reproduction. The benefits and functions of meiosis, however, are still under discussion, especially considering the costs of meiotic sex. To get a novel view on this old problem, we filter out the most conserved elements of meiosis itself by reviewing the various modifications and alterations of modes of reproduction. Our rationale is that the indispensable steps of meiosis for viability of offspring would be maintained by strong selection, while dispensable steps would be variable. We review evolutionary origin and processes in normal meiosis, restitutional meiosis, polyploidization and the alterations of meiosis in forms of uniparental reproduction (apomixis, apomictic parthenogenesis, automixis, selfing) with a focus on plants and animals. This overview suggests that homologue pairing, double-strand break formation and homologous recombinational repair at prophase I are the least dispensable elements, and they are more likely optimized for repair of oxidative DNA damage rather than for recombination. Segregation, ploidy reduction and also a biparental genome contribution can be skipped for many generations. The evidence supports the theory that the primary function of meiosis is DNA restoration rather than recombination."],["dc.description.sponsorship","German Research Fund (DFG) [Ho 4395/4-1]"],["dc.identifier.doi","10.1098/rspb.2016.1221"],["dc.identifier.isi","000386195400003"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/14307"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/39482"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Royal Soc"],["dc.relation.issn","1471-2954"],["dc.relation.issn","0962-8452"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0"],["dc.title","The evolution of meiotic sex and its alternatives"],["dc.type","review"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.journal","Frontiers in Plant Science"],["dc.bibliographiccitation.volume","12"],["dc.contributor.author","Wagner, Natascha D."],["dc.contributor.author","Volf, Martin"],["dc.contributor.author","Hörandl, Elvira"],["dc.date.accessioned","2021-10-01T09:57:39Z"],["dc.date.available","2021-10-01T09:57:39Z"],["dc.date.issued","2021"],["dc.description.abstract","Plastome phylogenomics is used in a broad range of studies where single markers do not bear enough information. Phylogenetic reconstruction in the genus Salix is difficult due to the lack of informative characters and reticulate evolution. Here, we use a genome skimming approach to reconstruct 41 complete plastomes of 32 Eurasian and North American Salix species representing different lineages, different ploidy levels, and separate geographic regions. We combined our plastomes with published data from Genbank to build a comprehensive phylogeny of 61 samples (50 species) using RAxML (Randomized Axelerated Maximum Likelihood). Additionally, haplotype networks for two observed subclades were calculated, and 72 genes were tested to be under selection. The results revealed a highly conserved structure of the observed plastomes. Within the genus, we observed a variation of 1.68%, most of which separated subg. Salix from the subgeneric Chamaetia/Vetrix clade. Our data generally confirm previous plastid phylogenies, however, within Chamaetia/Vetrix phylogenetic results represented neither taxonomical classifications nor geographical regions. Non-coding DNA regions were responsible for most of the observed variation within subclades and 5.6% of the analyzed genes showed signals of diversifying selection. A comparison of nuclear restriction site associated DNA (RAD) sequencing and plastome data on a subset of 10 species showed discrepancies in topology and resolution. We assume that a combination of (i) a very low mutation rate due to efficient mechanisms preventing mutagenesis, (ii) reticulate evolution, including ancient and ongoing hybridization, and (iii) homoplasy has shaped plastome evolution in willows."],["dc.description.abstract","Plastome phylogenomics is used in a broad range of studies where single markers do not bear enough information. Phylogenetic reconstruction in the genus Salix is difficult due to the lack of informative characters and reticulate evolution. Here, we use a genome skimming approach to reconstruct 41 complete plastomes of 32 Eurasian and North American Salix species representing different lineages, different ploidy levels, and separate geographic regions. We combined our plastomes with published data from Genbank to build a comprehensive phylogeny of 61 samples (50 species) using RAxML (Randomized Axelerated Maximum Likelihood). Additionally, haplotype networks for two observed subclades were calculated, and 72 genes were tested to be under selection. The results revealed a highly conserved structure of the observed plastomes. Within the genus, we observed a variation of 1.68%, most of which separated subg. Salix from the subgeneric Chamaetia/Vetrix clade. Our data generally confirm previous plastid phylogenies, however, within Chamaetia/Vetrix phylogenetic results represented neither taxonomical classifications nor geographical regions. Non-coding DNA regions were responsible for most of the observed variation within subclades and 5.6% of the analyzed genes showed signals of diversifying selection. A comparison of nuclear restriction site associated DNA (RAD) sequencing and plastome data on a subset of 10 species showed discrepancies in topology and resolution. We assume that a combination of (i) a very low mutation rate due to efficient mechanisms preventing mutagenesis, (ii) reticulate evolution, including ancient and ongoing hybridization, and (iii) homoplasy has shaped plastome evolution in willows."],["dc.description.sponsorship","Open-Access-Publikationsfonds 2021"],["dc.identifier.doi","10.3389/fpls.2021.662715"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/89885"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-469"],["dc.relation.eissn","1664-462X"],["dc.relation.orgunit","Albrecht-von-Haller-Institut für Pflanzenwissenschaften"],["dc.rights","http://creativecommons.org/licenses/by/4.0/"],["dc.title","Highly Diverse Shrub Willows (Salix L.) Share Highly Similar Plastomes"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","3318"],["dc.bibliographiccitation.issue","9"],["dc.bibliographiccitation.journal","International Journal of Molecular Sciences"],["dc.bibliographiccitation.volume","21"],["dc.contributor.affiliation","Schinkel, Christoph C. F.; \t\t \r\n\t\t Department of Systematics, Biodiversity and Evolution of Plants (with Herbarium), University of Goettingen, Untere Karspüle 2, 37073 Göttingen, Germany, christoph.cf.schinkel@gmail.com"],["dc.contributor.affiliation","Syngelaki, Eleni; \t\t \r\n\t\t Department of Systematics, Biodiversity and Evolution of Plants (with Herbarium), University of Goettingen, Untere Karspüle 2, 37073 Göttingen, Germany, eleni.syngelaki@uni-goettingen.de"],["dc.contributor.affiliation","Kirchheimer, Bernhard; \t\t \r\n\t\t Department of Botany and Biodiversity Research, University of Vienna, Rennweg 14, 1030 Vienna, Austria, bernhard.kirchheimer@univie.ac.at"],["dc.contributor.affiliation","Dullinger, Stefan; \t\t \r\n\t\t Department of Botany and Biodiversity Research, University of Vienna, Rennweg 14, 1030 Vienna, Austria, stefan.dullinger@univie.ac.at"],["dc.contributor.affiliation","Klatt, Simone; \t\t \r\n\t\t Section Safety and Environmental Protection, University of Goettingen, Humboldtallee 15, 37073 Göttingen, Germany, simone.klatt@zvw.uni-goettingen.de"],["dc.contributor.affiliation","Hörandl, Elvira; \t\t \r\n\t\t Department of Systematics, Biodiversity and Evolution of Plants (with Herbarium), University of Goettingen, Untere Karspüle 2, 37073 Göttingen, Germany, ehoeran@gwdg.de"],["dc.contributor.author","Schinkel, Christoph C. F."],["dc.contributor.author","Syngelaki, Eleni"],["dc.contributor.author","Kirchheimer, Bernhard"],["dc.contributor.author","Dullinger, Stefan"],["dc.contributor.author","Klatt, Simone"],["dc.contributor.author","Hörandl, Elvira"],["dc.date.accessioned","2021-04-14T08:26:23Z"],["dc.date.available","2021-04-14T08:26:23Z"],["dc.date.issued","2020"],["dc.date.updated","2022-09-07T00:24:28Z"],["dc.description.sponsorship","Deutsche Forschungsgemeinschaft"],["dc.description.sponsorship","Austrian Science Fund"],["dc.identifier.doi","10.3390/ijms21093318"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/17424"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/81927"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-399"],["dc.notes.intern","Merged from goescholar"],["dc.relation.eissn","1422-0067"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","Epigenetic Patterns and Geographical Parthenogenesis in the Alpine Plant Species Ranunculus kuepferi (Ranunculaceae)"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","e103003"],["dc.bibliographiccitation.issue","7"],["dc.bibliographiccitation.journal","PLoS ONE"],["dc.bibliographiccitation.volume","9"],["dc.contributor.author","Hodac, Ladislav"],["dc.contributor.author","Scheben, Armin Patrick"],["dc.contributor.author","Hojsgaard, Diego H."],["dc.contributor.author","Paun, Ovidiu"],["dc.contributor.author","Hoerandl, Elvira"],["dc.date.accessioned","2018-11-07T09:37:30Z"],["dc.date.available","2018-11-07T09:37:30Z"],["dc.date.issued","2014"],["dc.description.abstract","The reconstruction of reticulate evolutionary histories in plants is still a major methodological challenge. Sequences of the ITS nrDNA are a popular marker to analyze hybrid relationships, but variation of this multicopy spacer region is affected by concerted evolution, high intraindividual polymorphism, and shifts in mode of reproduction. The relevance of changes in secondary structure is still under dispute. We aim to shed light on the extent of polymorphism within and between sexual species and their putative natural as well as synthetic hybrid derivatives in the Ranunculus auricomus complex to test morphology-based hypotheses of hybrid origin and parentage of taxa. We employed direct sequencing of ITS nrDNA from 68 individuals representing three sexuals, their synthetic hybrids and one sympatric natural apomict, as well as cloning of ITS copies in four representative individuals, RNA secondary structure analysis, and landmark geometric morphometric analysis on leaves. Phylogenetic network analyses indicate additivity of parental ITS variants in both synthetic and natural hybrids. The triploid synthetic hybrids are genetically much closer to their maternal progenitors, probably due to ploidy dosage effects, although exhibiting a paternal-like leaf morphology. The natural hybrids are genetically and morphologically closer to the putative paternal progenitor species. Secondary structures of ITS1-5.8S-ITS2 were rather conserved in all taxa. The observed similarities in ITS polymorphisms suggest that the natural apomict R. variabilis is an ancient hybrid of the diploid sexual species R. notabilis and the sexual species R. cassubicifolius. The additivity pattern shared by R. variabilis and the synthetic hybrids supports an evolutionary and biogeographical scenario that R. variabilis originated from ancient hybridization. Concerted evolution of ITS copies in R. variabilis is incomplete, probably due to a shift to asexual reproduction. Under the condition of comprehensive inter- and intraspecific sampling, ITS polymorphisms are powerful for elucidating reticulate evolutionary histories."],["dc.description.sponsorship","Austrian Research Foundation (FWF) [310-B16]"],["dc.identifier.doi","10.1371/journal.pone.0103003"],["dc.identifier.isi","000339992600031"],["dc.identifier.pmid","25062066"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/10558"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/32857"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Public Library Science"],["dc.relation.issn","1932-6203"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0"],["dc.title","ITS Polymorphisms Shed Light on Hybrid Evolution in Apomictic Plants: A Case Study on the Ranunculus auricomus Complex"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","976765"],["dc.bibliographiccitation.journal","Frontiers in Plant Science"],["dc.bibliographiccitation.volume","13"],["dc.contributor.affiliation","He, Li; 1Eastern China Conservation Centre for Wild Endangered Plant Resources, Shanghai Chenshan Botanical Garden, Shanghai, China"],["dc.contributor.affiliation","Hörandl, Elvira; 2Department of Systematics, Biodiversity and Evolution of Plants, University of Göttingen, Göttingen, Germany"],["dc.contributor.author","He, Li"],["dc.contributor.author","Hörandl, Elvira"],["dc.date.accessioned","2022-12-01T08:31:35Z"],["dc.date.available","2022-12-01T08:31:35Z"],["dc.date.issued","2022"],["dc.date.updated","2022-11-11T13:12:56Z"],["dc.description.abstract","Dioecy is rare in flowering plants (5–6% of species), but is often controlled genetically by sex-linked regions (SLRs). It has so far been unclear whether, polyploidy affects sex chromosome evolution, as it does in animals, though polyploidy is quite common in angiosperms, including in dioecious species. Plants could be different, as, unlike many animal systems, degenerated sex chromosomes, are uncommon in plants. Here we consider sex determination in plants and plant-specific factors, and propose that constraints created at the origin of polyploids limit successful polyploidization of species with SLRs. We consider the most likely case of a polyploid of a dioecious diploid with an established SLR, and discuss the outcome in autopolyploids and allopolyploids. The most stable system possibly has an SLR on just one chromosome, with a strongly dominant genetic factor in the heterogametic sex (e.g., xxxY male in a tetraploid). If recombination occurs with its homolog, this will prevent Y chromosome degeneration. Polyploidy may also allow for reversibility of multiplied Z or X chromosomes into autosomes. Otherwise, low dosage of Y-linked SLRs compared to their multiple homologous x copies may cause loss of reliable sex-determination at higher ploidy levels. We discuss some questions that can be studied using genome sequencing, chromosome level-assemblies, gene expression studies and analysis of loci under selection."],["dc.description.sponsorship","Open-Access-Publikationsfonds 2022"],["dc.identifier.doi","10.3389/fpls.2022.976765"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/118209"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-621"],["dc.publisher","Frontiers Media S.A."],["dc.relation.eissn","1664-462X"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0/"],["dc.title","Does polyploidy inhibit sex chromosome evolution in angiosperms?"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","204"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Plants"],["dc.bibliographiccitation.volume","11"],["dc.contributor.author","Hörandl, Elvira"],["dc.date.accessioned","2022-02-01T10:31:50Z"],["dc.date.available","2022-02-01T10:31:50Z"],["dc.date.issued","2022"],["dc.date.updated","2022-02-09T13:17:52Z"],["dc.description.abstract","Hybridization and polyploidization are important processes for plant evolution. However, classification of hybrid or polyploid species has been notoriously difficult because of the complexity of processes and different evolutionary scenarios that do not fit with classical species concepts. Polyploid complexes are formed via combinations of allopolyploidy, autopolyploidy and homoploid hybridization with persisting sexual reproduction, resulting in many discrete lineages that have been classified as species. Polyploid complexes with facultative apomixis result in complicated net-work like clusters, or rarely in agamospecies. Various case studies illustrate the problems that apply to traditional species concepts to hybrids and polyploids. Conceptual progress can be made if lineage formation is accepted as an inevitable consequence of meiotic sex, which is established already in the first eukaryotes as a DNA restoration tool. The turnaround of the viewpoint that sex forms species as lineages helps to overcome traditional thinking of species as “units”. Lineage formation and self-sustainability is the prerequisite for speciation and can also be applied to hybrids and polyploids. Species delimitation is aided by the improved recognition of lineages via various novel -omics methods, by understanding meiosis functions, and by recognizing functional phenotypes by considering morphological-physiological-ecological adaptations."],["dc.description.abstract","Hybridization and polyploidization are important processes for plant evolution. However, classification of hybrid or polyploid species has been notoriously difficult because of the complexity of processes and different evolutionary scenarios that do not fit with classical species concepts. Polyploid complexes are formed via combinations of allopolyploidy, autopolyploidy and homoploid hybridization with persisting sexual reproduction, resulting in many discrete lineages that have been classified as species. Polyploid complexes with facultative apomixis result in complicated net-work like clusters, or rarely in agamospecies. Various case studies illustrate the problems that apply to traditional species concepts to hybrids and polyploids. Conceptual progress can be made if lineage formation is accepted as an inevitable consequence of meiotic sex, which is established already in the first eukaryotes as a DNA restoration tool. The turnaround of the viewpoint that sex forms species as lineages helps to overcome traditional thinking of species as “units”. Lineage formation and self-sustainability is the prerequisite for speciation and can also be applied to hybrids and polyploids. Species delimitation is aided by the improved recognition of lineages via various novel -omics methods, by understanding meiosis functions, and by recognizing functional phenotypes by considering morphological-physiological-ecological adaptations."],["dc.description.sponsorship","Open-Access-Publikationsfonds 2022"],["dc.identifier.doi","10.3390/plants11020204"],["dc.identifier.eissn","2223-7747"],["dc.identifier.pii","plants11020204"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/98960"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-517"],["dc.relation.eissn","2223-7747"],["dc.rights","CC BY 4.0"],["dc.title","Novel Approaches for Species Concepts and Delimitation in Polyploids and Hybrids"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","716"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Journal of Biogeography"],["dc.bibliographiccitation.lastpage","726"],["dc.bibliographiccitation.volume","43"],["dc.contributor.author","Kirchheimer, Bernhard"],["dc.contributor.author","Schinkel, Christoph C. F."],["dc.contributor.author","Dellinger, Agnes S."],["dc.contributor.author","Klatt, Simone"],["dc.contributor.author","Moser, Dietmar"],["dc.contributor.author","Winkler, Manuela"],["dc.contributor.author","Lenoir, Jonathan"],["dc.contributor.author","Caccianiga, Marco"],["dc.contributor.author","Guisan, Antoine"],["dc.contributor.author","Nieto-Lugilde, Diego"],["dc.contributor.author","Svenning, Jens-Christian"],["dc.contributor.author","Thuiller, Wilfried"],["dc.contributor.author","Vittoz, Pascal"],["dc.contributor.author","Willner, Wolfgang"],["dc.contributor.author","Zimmermann, Niklaus E."],["dc.contributor.author","Hoerandl, Elvira"],["dc.contributor.author","Dullinger, Stefan"],["dc.date.accessioned","2018-11-07T10:16:26Z"],["dc.date.available","2018-11-07T10:16:26Z"],["dc.date.issued","2016"],["dc.description.abstract","AimEmerging polyploids may depend on environmental niche shifts for successful establishment. Using the alpine plant Ranunculus kuepferi as a model system, we explore the niche shift hypothesis at different spatial resolutions and in contrasting parts of the species range. LocationEuropean Alps. MethodsWe sampled 12 individuals from each of 102 populations of R. kuepferi across the Alps, determined their ploidy levels, derived coarse-grain (100x100m) environmental descriptors for all sampling sites by downscaling WorldClim maps, and calculated fine-scale environmental descriptors (2x2m) from indicator values of the vegetation accompanying the sampled individuals. Both coarse and fine-scale variables were further computed for 8239 vegetation plots from across the Alps. Subsequently, we compared niche optima and breadths of diploid and tetraploid cytotypes by combining principal components analysis and kernel smoothing procedures. Comparisons were done separately for coarse and fine-grain data sets and for sympatric, allopatric and the total set of populations. ResultsAll comparisons indicate that the niches of the two cytotypes differ in optima and/or breadths, but results vary in important details. The whole-range analysis suggests differentiation along the temperature gradient to be most important. However, sympatric comparisons indicate that this climatic shift was not a direct response to competition with diploid ancestors. Moreover, fine-grained analyses demonstrate niche contraction of tetraploids, especially in the sympatric range, that goes undetected with coarse-grained data. Main conclusionsAlthough the niche optima of the two cytotypes differ, separation along ecological gradients was probably less decisive for polyploid establishment than a shift towards facultative apomixis, a particularly effective strategy to avoid minority cytotype exclusion. In addition, our results suggest that coarse-grained analyses overestimate niche breadths of widely distributed taxa. Niche comparison analyses should hence be conducted at environmental data resolutions appropriate for the organism and question under study."],["dc.identifier.doi","10.1111/jbi.12663"],["dc.identifier.isi","000373154000007"],["dc.identifier.pmid","27482126"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/13234"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/41038"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Wiley-blackwell"],["dc.relation.issn","1365-2699"],["dc.relation.issn","0305-0270"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0"],["dc.title","A matter of scale: apparent niche differentiation of diploid and tetraploid plants may depend on extent and grain of analysis"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","414"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","Critical Reviews in Plant Sciences"],["dc.bibliographiccitation.lastpage","427"],["dc.bibliographiccitation.volume","33"],["dc.contributor.author","Hojsgaard, Diego H."],["dc.contributor.author","Klatt, Simone"],["dc.contributor.author","Baier, Roland"],["dc.contributor.author","Carman, John G."],["dc.contributor.author","Hoerandl, Elvira"],["dc.date.accessioned","2018-11-07T09:46:08Z"],["dc.date.available","2018-11-07T09:46:08Z"],["dc.date.issued","2014"],["dc.description.abstract","Apomixis in angiosperms is asexual reproduction from seed. Its importance to angiospermous evolution and biodiversity has been difficult to assess mainly because of insufficient taxonomic documentation. Thus, we assembled literature reporting apomixis occurrences among angiosperms and transferred the information to an internet database (http://www.apomixis.uni-goettingen.de). We then searched for correlations between apomixis occurrences and well-established measures of taxonomic diversity and biogeography. Apomixis was found to be taxonomically widespread with no clear tendency to specific groups and to occur with sexuality at all taxonomic levels. Adventitious embryony was the most frequent form (148 genera) followed by apospory (110) and diplospory (68). All three forms are phylogenetically scattered, but this scattering is strongly associated with measures of biodiversity. Across apomictic-containing orders and families, numbers of apomict-containing genera were positively correlated with total numbers of genera. In general, apomict-containing orders, families, and subfamilies of Asteraceae, Poaceae, and Orchidaceae were larger, i.e., they possessed more families or genera, than non-apomict-containing orders, families or subfamilies. Furthermore, many apomict-containing genera were found to be highly cosmopolitan. In this respect, 62% occupy multiple geographic zones. Numbers of genera containing sporophytic or gametophytic apomicts decreased from the tropics to the arctic, a trend that parallels general biodiversity. While angiosperms appear to be predisposed to shift from sex to apomixis, there is also evidence of reversions to sexuality. Such reversions may result from genetic or epigenetic destabilization events accompanying hybridization, polyploidy, or other cytogenetic alterations. Because of increased within-plant genetic and genomic heterogeneity, range expansions and diversifications at the species and genus levels may occur more rapidly upon reversion to sexuality. The significantly-enriched representations of apomicts among highly diverse and geographically-extensive taxa, from genera to orders, support this conclusion."],["dc.identifier.doi","10.1080/07352689.2014.898488"],["dc.identifier.isi","000337609200004"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/11437"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/34794"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Taylor & Francis Inc"],["dc.relation.issn","1549-7836"],["dc.relation.issn","0735-2689"],["dc.rights","CC BY 3.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/3.0"],["dc.title","Taxonomy and Biogeography of Apomixis in Angiosperms and Associated Biodiversity Characteristics"],["dc.type","review"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","278"],["dc.bibliographiccitation.journal","Frontiers in Plant Science"],["dc.bibliographiccitation.volume","7"],["dc.contributor.author","Klatt, Simone"],["dc.contributor.author","Hadacek, Franz"],["dc.contributor.author","Brinkmann, Gina"],["dc.contributor.author","Eilerts, Marius"],["dc.contributor.author","Hojsgaard, Diego H."],["dc.contributor.author","Hodač, Ladislav"],["dc.contributor.author","Hörandl, Elvira"],["dc.date.accessioned","2018-11-07T10:16:55Z"],["dc.date.available","2018-11-07T10:16:55Z"],["dc.date.issued","2016"],["dc.description.abstract","Meiosis, the key step of sexual reproduction, persists in facultative apomictic plants functional to some extent. However, it still remains unclear how and why proportions of reproductive pathways vary under different environmental stress conditions. We hypothesized that oxidative stress mediates alterations of developmental pathways. In apomictic plants we expected that megasporogenesis, the stage directly after meiosis, would be more affected than later stages of seed development. To simulate moderate stress conditions we subjected clone-mates of facultative apomictic Ranunculus auricomus to 10 h photoperiods, reflecting natural conditions, and extended ones (16.5 h). Reproduction mode was screened directly after megasporogenesis (microscope) and at seed stage (flow cytometric seed screening). Targeted metabolite profiles were performed with HPLC-DAD to explore if and which metabolic reprogramming was caused by the extended photoperiod. Prolonged photoperiods resulted in increased frequencies of sexual vs. aposporous initials directly after meiosis, but did not affect frequencies of sexual vs. asexual seed formation. Changes in secondary metabolite profiles under extended photoperiods affected all classes of compounds, and c. 20% of these changes separated the two treatments. Unexpectedly, the renowned antioxidant phenylpropanoids and flavonoids added more to clone-mate variation than to treatment differentiation. Among others, chlorophyll degradation products, non-assigned phenolic compounds and more lipophilic metabolites also contributed to the dissimilarity of the metabolic profiles of plants that had been exposed to the two different photoperiods. The hypothesis of moderate light stress effects was supported by increased proportions of sexual megaspore development at the expense of aposporous initial formation. The lack of effects at the seed stage confirms the basic assumption that only meiosis and sporogenesis would be sensitive to light stress. The concomitant change of secondary metabolite profiles, as a systemic response at this early developmental stage, supports the notion that oxidative stress could have affected megasporogenesis by causing the observed metabolic reprogramming. Hypotheses of genotype-specific responses to prolonged photoperiods are rejected."],["dc.description.sponsorship","Open-Access Publikationsfonds 2016"],["dc.identifier.doi","10.3389/fpls.2016.00278"],["dc.identifier.isi","000371400600001"],["dc.identifier.pmid","27014302"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/12965"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/41132"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Frontiers Media S.A."],["dc.relation.eissn","1664-462X"],["dc.relation.issn","1664-462X"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0"],["dc.title","Photoperiod Extension Enhances Sexual Megaspore Formation and Triggers Metabolic Reprogramming in Facultative Apomictic Ranunculus auricomus"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1313"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","New Phytologist"],["dc.bibliographiccitation.lastpage","1323"],["dc.bibliographiccitation.volume","209"],["dc.contributor.author","Dellinger, Agnes S."],["dc.contributor.author","Essl, Franz"],["dc.contributor.author","Hojsgaard, Diego H."],["dc.contributor.author","Kirchheimer, Bernhard"],["dc.contributor.author","Klatt, Simone"],["dc.contributor.author","Dawson, Wayne"],["dc.contributor.author","Pergl, Jan"],["dc.contributor.author","Pysek, Petr"],["dc.contributor.author","van Kleunen, Mark"],["dc.contributor.author","Weber, Ewald"],["dc.contributor.author","Winter, Marten"],["dc.contributor.author","Hoerandl, Elvira"],["dc.contributor.author","Dullinger, Stefan"],["dc.date.accessioned","2018-11-07T10:18:25Z"],["dc.date.available","2018-11-07T10:18:25Z"],["dc.date.issued","2016"],["dc.description.abstract","Biological invasions can be associated with shifts of the species' climatic niches but the incidence of such shifts is under debate. The reproductive system might be a key factor controlling such shifts because it influences a species' evolutionary flexibility. However, the link between reproductive systems and niche dynamics in plant invasions has been little studied so far. We compiled global occurrence data sets of 13 congeneric sexual and apomictic species pairs, and used principal components analysis (PCA) and kernel smoothers to compare changes in climatic niche optima, breadths and unfilling/expansion between native and alien ranges. Niche change metrics were compared between sexual and apomictic species. All 26 species showed changes in niche optima and/or breadth and 14 species significantly expanded their climatic niches. However, we found no effect of the reproductive system on niche dynamics. Instead, species with narrower native niches showed higher rates of niche expansion in the alien ranges. Our results suggest that niche shifts are frequent in plant invasions but evolutionary potential may not be of major importance for such shifts. Niche dynamics rather appear to be driven by changes of the realized niche without adaptive change of the fundamental climatic niche."],["dc.identifier.doi","10.1111/nph.13694"],["dc.identifier.isi","000373378000041"],["dc.identifier.pmid","26508329"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/13411"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/41438"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation","SFB 990: Ökologische und sozioökonomische Funktionen tropischer Tieflandregenwald-Transformationssysteme (Sumatra, Indonesien)"],["dc.relation","SFB 990 | B | B12: Reproductive strategies of weedy flowering plants in tropical rainforest transformation systems"],["dc.relation.issn","1469-8137"],["dc.relation.issn","0028-646X"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0"],["dc.subject.gro","sfb990_journalarticles"],["dc.title","Niche dynamics of alien species do not differ among sexual and apomictic flowering plants"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]