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342 results for “Jacobaea”
Senecio jacobaea L. (BR0000012452729)
Belgium Herbarium image of <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
Senecio jacobaea L. (BR0000011812470)
Belgium Herbarium image of <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
Senecio jacobaea L. (BR0000011767114)
Belgium Herbarium image of <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
Senecio jacobaea L. (BR0000011766445)
Belgium Herbarium image of <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
Senecio jacobaea L. (BR0000011767442)
Belgium Herbarium image of <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
Senecio jacobaea L. (BR0000011766667)
Belgium Herbarium image of <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
Senecio jacobaea L. (BR0000012339723)
Belgium Herbarium image of <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
Senecio jacobaea L. (BR0000009668928)
Belgium Herbarium image of <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
Senecio jacobaea L. (BR0000012526369)
Belgium Herbarium image of <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
Data from: Ecological differentiation, lack of hybrids involving diploids, and asymmetric gene flow between polyploids in narrow contact zones of Senecio carniolicus (syn. Jacobaea carniolica, Asteraceae)
Areas of immediate contact of different cytotypes offer a unique opportunity to study evolutionary dynamics within heteroploid species and to assess isolation mechanisms governing coexistence of cytotypes of different ploidy. The degree of reproductive isolation of cytotypes, i.e., the frequency of heteroploid crosses and subsequent formation of viable and (partly) fertile hybrids, plays a crucial role for the long-term integrity of lineages in contact zones. Here, we assessed fine-scale distribution, spatial clustering and ecological niches as well as patterns of gene-flow in parental and hybrid cytotypes in zones of immediate contact of di-, tetra- and hexaploid Senecio carniolicus (Asteraceae) in the Eastern Alps. Cytotypes were spatially separated also at the investigated micro-scale; the strongest spatial separation was observed for the fully interfertile tetra- and hexaploids. The three main cytotypes showed highly significant niche differences, which were, however, weaker than across their entire distribution ranges in the Eastern Alps. Individuals with intermediate ploidy levels were found neither in the diploid/tetraploid nor in the diploid/hexaploid contact zones indicating strong reproductive barriers. In contrast, pentaploid individuals were frequent in the tetraploid/hexaploid contact zone, albeit limited to a narrow strip in the immediate contact zone of their parental cytotypes. AFLP fingerprinting data revealed introgressive gene flow mediated by pentaploid hybrids from tetra- to hexaploid individuals, but not vice versa. The ecological niche of pentaploids differed significantly from that of tetraploids but not from hexaploids.
FIGURE 4 in Molecular and cytogenetic confirmation of the hybrid origin of Jacobaea ×mirabilis (Asteraceae, Senecioneae), with nomenclatural notes on this name
FIGURE 4. Capitula of the studied taxa (Mézenc, August 2013). From left to right: Jacobaea leucophylla, J. ×mirabilis, J. adonidifolia (two capitula of each taxon).
FIGURE 2 in Molecular and cytogenetic confirmation of the hybrid origin of Jacobaea ×mirabilis (Asteraceae, Senecioneae), with nomenclatural notes on this name
FIGURE 2. ITS network in Jacobaea, and leaves of the studied taxa. Numbers below the branches are bootstrap values.
FIGURE 3. Haplotypes network from rpl32 in Molecular and cytogenetic confirmation of the hybrid origin of Jacobaea ×mirabilis (Asteraceae, Senecioneae), with nomenclatural notes on this name
FIGURE 3. Haplotypes network from rpl32-trnL region in Jacobaea. Each circle corresponds to a haplotype and circles' size is proportional to haplotype frequency (from n=1 to n=5). Small white circles represent single mutational steps.
FIGURE 1 in Molecular and cytogenetic confirmation of the hybrid origin of Jacobaea ×mirabilis (Asteraceae, Senecioneae), with nomenclatural notes on this name
FIGURE 1. Boxplot graph indicating genome size means per species for the three Jacobaea taxa studied with standard deviation and the number of specimens sampled (n). Asterisk and circle indicate outlier values.
FIGURE 8 in Nuclear ITS/ETS sequence data indicate the membership of Senecio racemulifer, but not S. acutipinnus and S. graciliflorus, within the genus Jacobaea (Asteraceae, Senecioneae)
FIGURE 8. Phylogeny of tribe Senecioneae using maximum likelihood analysis based on concatenated ITS and ETS data. Bootstrap values (maximum likelihood/maximum parsimony; MLBS/MPBS) ≥ 70% and Bayesian posterior probabilities (PP) ≥ 0.95 are indicated above and below branches, respectively. Dashes (-) indicate bootstrap values <70%.
FIGURE 5 in Nuclear ITS/ETS sequence data indicate the membership of Senecio racemulifer, but not S. acutipinnus and S. graciliflorus, within the genus Jacobaea (Asteraceae, Senecioneae)
FIGURE 5. Senecio acutipinnus in the wild (Wenshan county, Yunnan, China). A. Habitat. B. Habit. C. Rhizome and roots. D. Proximal to distal stem leaves. E. Synflorescence. F. Capitula. G. Phyllaries (abaxial side). H. Disc florets. I. Achene and pappus. Photographed by Wen-qun Fei.
FIGURE 6 in Nuclear ITS/ETS sequence data indicate the membership of Senecio racemulifer, but not S. acutipinnus and S. graciliflorus, within the genus Jacobaea (Asteraceae, Senecioneae)
FIGURE 6. Senecio graciliflorus in the wild (Lhünzê, Xizang, China). A. Habitat. B. Habit. C. Rhizome and roots. D. Leaf. E. Synflorescence. F. Capitula. G. Phyllaries (abaxial side). H. Ray florets. I. Disc florets. Photographed by Long Wang.
FIGURE 7 in Nuclear ITS/ETS sequence data indicate the membership of Senecio racemulifer, but not S. acutipinnus and S. graciliflorus, within the genus Jacobaea (Asteraceae, Senecioneae)
FIGURE 7. Mitotic metaphase chromosomes (A–D) and karyotypes (E–H) of Senecio acutipinnus (A, B, E, F), S. graciliflorus (C, G), and S. racemulifer (= Jacobaea racemulifera; D, H). All the three species have 2n = 40 = 40 m. A–C, the same scale; E–H, the same scale.
FIGURE 4 in Nuclear ITS/ETS sequence data indicate the membership of Senecio racemulifer, but not S. acutipinnus and S. graciliflorus, within the genus Jacobaea (Asteraceae, Senecioneae)
FIGURE 4. Selected specimens of Senecio acutipinnus. A. China, Guizhou, Leishan county, X.L. Yu 14111003 (CSF). B. China, Yunnan, Yongde county, E.D. Liu & Z.F. Xu 3422 (KUN).
FIGURE 3 in Nuclear ITS/ETS sequence data indicate the membership of Senecio racemulifer, but not S. acutipinnus and S. graciliflorus, within the genus Jacobaea (Asteraceae, Senecioneae)
FIGURE 3. Senecio racemulifer (= Jacobaea racemulifera) in the wild (Wuqia county, Xinjiang, China). A. Habitat. B. Habit. C. Rhizome and roots. D. Basal to distal stem leaves. E. Synflorescence. F. Capitulum. G. Longitudinal section of involucre. H. Ray florets. I. Disc florets. Photographed by Hui-min Li.
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