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77 results for “Posidonia”
Figure 1 from: Gnisci V, Cognetti de Martiis S, Belmonte A, Micheli C, Piermattei V, Bonamano S, Marcelli M (2020) Assessment of the ecological structure of Posidonia oceanica (L.) Delile on the northern coast of Lazio, Italy (central Tyrrhenian, Mediterranean). Italian Botanist 9: 1-19. https://doi.org/10.3897/italianbotanist.9.46426
Figure 1 Map of the study area in northern coast of Lazio (Italy, central Tyrrhenian, Mediterranean) with the sampling sites of Posidonia oceanica.
A king and vassals' tale: molecular signatures of clonal integration in Posidonia oceanica under chronic light shortage
<p>1. Under unfavourable conditions, clonal plants benefit from physiological integration among ramets, sharing resources and information. Clonal integration can buffer against environmental changes and let the plant clone work as a "macro" organism. Molecular signals that regulate this phenomenon are completely unknown in marine plants.</p> <p>2. Here, we present a first comprehensive study providing insights into the metabolic role of different types of ramets (i.e., apical vs vertical) in the foundation species Posidonia oceanica. Plants were exposed to 80% diminishing irradiance level (LL) in a controlled-mesocosm system. Subsequent multi-scale variations in whole transcriptome expression, global DNA methylation level, photo-physiology, morphology and fitness-related traits, were explored at different exposure times. We tested the hypothesis that vertical shoots (the "vassals") can provide vital resources to apical shoots (the "kings") under energy shortage, thus safeguarding the whole clone survival.</p> <p>3. Whole transcriptome analysis of leaves and shoot-apical meristems (SAMs) emphasised signatures of molecular integration among ramets, which strongly correlated with higher organisation level responses. In both shoots types, the exposure to LL resulted in a growth slowdown throughout the experiment, which started from immediate signals in SAMs. In apical shoots, this was linked to an acclimative response, where they were suffering a mild stress condition, while in vertical ones it resulted in a more severe stress response. Yet, they suffered from sugar starvation and showed a clear cellular stress response in terms of protein refolding and DNA repair mechanisms. Several epigenetic mechanisms modulated the observed gene-expression patterns and the cross-talk between DNA methylation and the cellular energetic status appeared to regulate shoot metabolism under LL.</p> <p>4. Synthesis. Our results demonstrate a high level of specialisation of integrated ramets within seagrass clones and a "division of labour" under adverse conditions. Vertical shoots appear to do "most of the job" especially in terms of resource providing, whereas activated functions in apical shoots were restricted to few important processes, according to an "energy-saving" strategy. The response of vertical shoots could be seen as a "sacrificing response" allowing the survival of "the king" that is key for ensuring propagation and population maintenance, and for the colonisation of new environments.</p>
Figure 5 in Patterns of spatial variability of mobile macro-invertebrate assemblages within a Posidonia oceanica meadow
Figure 5. Percentage pseudo-variance components of mobile macro-invertebrate assemblages of Posidonia oceanica meadow at (a) shallow, (b) intermediate and (c) deep stands.
Fig. 2 in In situ experiments on the effect of low pH on the ultrastructure of the seagrasses Cymodocea nodosa and Posidonia oceanica Abstract
Fig. 2: A-C. TEM micrographs of young epidermal cells of P. oceanica control material. A. Epidermal cells orthogonal in shape, with dense cytoplasm and a round-shaped nucleus. The arrow marks the direction towards the leaf apex. B. Higher magnification of a nucleus with an impressive network of condensed chromatin. C. Undifferentiated chloroplast with large plastoglobuli. ER and mitochondria are also positioned in the cell periphery. Scale bars = 2 μm (A), 1μm (B) and 0.5μm (C).
Supplementary material 2 from: Vohník M, Borovec O, Kolaříková Z, Sudová R, Réblová M (2019) Extensive sampling and high-throughput sequencing reveal Posidoniomyces atricolor gen. et sp. nov. (Aigialaceae, Pleosporales) as the dominant root mycobiont of the dominant Mediterranean seagrass Posidonia oceanica. MycoKeys 55: 59-86. https://doi.org/10.3897/mycokeys.55.35682
: Data type: species data
Figure 6 from: Vohník M, Borovec O, Kolaříková Z, Sudová R, Réblová M (2019) Extensive sampling and high-throughput sequencing reveal Posidoniomyces atricolor gen. et sp. nov. (Aigialaceae, Pleosporales) as the dominant root mycobiont of the dominant Mediterranean seagrass Posidonia oceanica. MycoKeys 55: 59-86. https://doi.org/10.3897/mycokeys.55.35682
Figure 6 Colonial morphotypes of Posidoniomycesatricolor in vitro (type isolate BRK-21). a Compact morphotype with substrate mycelium b, d compact colonies with a cerebriform pattern c colony of P.atricolor on PCA e rhizoidal and compact (arrow) daughter colonies on PCA washed with sterile tap water f detail of the colonies encircled in e; g, h terminal capitate swellings on the surface of compact colonies i–k conspicuous swellings on aerial mycelium. Scale bars: 500 μm (a, d), 1000 μm (b, c), 5 mm (e), 200 μm (f), 100 μm (g), 20 μm (h).
Figure 5 from: Vohník M, Borovec O, Kolaříková Z, Sudová R, Réblová M (2019) Extensive sampling and high-throughput sequencing reveal Posidoniomyces atricolor gen. et sp. nov. (Aigialaceae, Pleosporales) as the dominant root mycobiont of the dominant Mediterranean seagrass Posidonia oceanica. MycoKeys 55: 59-86. https://doi.org/10.3897/mycokeys.55.35682
Figure 5 In vivo root colonisation pattern and in vitro cultural aspects of Posidoniomycesatricolor. a In vivo colonisation on the root surface (arrows) and in the hypodermis (asterisks) of P.oceanicabDSE colonisation on the root surface c germinating microsclerotia stained with trypan blue (arrows) d compact colony developed from microsclerotia (arrow) e surface-sterilised root segments yielding P.atricolor compact colonies (black arrows), sometimes with substrate mycelium (white arrows) f compact colonial morphotype g mycelial colonial morphotype h mycelial morphotype developing from microsclerotia (arrows) in transversal section. Scale bars: 20 μm (a, b), 50 μm (c), 100 μm (d), 200 μm (f, h), 500 μm (g).
Figure 2 from: Vohník M, Borovec O, Kolaříková Z, Sudová R, Réblová M (2019) Extensive sampling and high-throughput sequencing reveal Posidoniomyces atricolor gen. et sp. nov. (Aigialaceae, Pleosporales) as the dominant root mycobiont of the dominant Mediterranean seagrass Posidonia oceanica. MycoKeys 55: 59-86. https://doi.org/10.3897/mycokeys.55.35682
Figure 2 Map of the Mediterranean Sea with location of our 32 sampling sites. For further details see Table 1.
Figure 4 from: Vohník M, Borovec O, Kolaříková Z, Sudová R, Réblová M (2019) Extensive sampling and high-throughput sequencing reveal Posidoniomyces atricolor gen. et sp. nov. (Aigialaceae, Pleosporales) as the dominant root mycobiont of the dominant Mediterranean seagrass Posidonia oceanica. MycoKeys 55: 59-86. https://doi.org/10.3897/mycokeys.55.35682
Figure 4 Phylogram and map showing a distribution pattern of Posidoniomycesatricolor. a Phylogram generated from maximum likelihood analysis based on ITS sequence data for Posidoniomycesatricolor and representatives of the Aigialaceaeb map of the Mediterranean Sea with our 32 sampling sites. Sites in blue, orange, violet and green colour indicate locations of P.atricolor strains with corresponding mutations in ITS2 sequences.
Figure 3 from: Vohník M, Borovec O, Kolaříková Z, Sudová R, Réblová M (2019) Extensive sampling and high-throughput sequencing reveal Posidoniomyces atricolor gen. et sp. nov. (Aigialaceae, Pleosporales) as the dominant root mycobiont of the dominant Mediterranean seagrass Posidonia oceanica. MycoKeys 55: 59-86. https://doi.org/10.3897/mycokeys.55.35682
Figure 3 Phylogram generated from maximum likelihood analysis based on combined nucLSU, nucSSU and RPB2 sequence data for Posidoniomycesatricolor and the Aigialaceae. Species names given in bold are type species. The ex-type of the taxonomic novelty is in bold and blue. An asterisk (*) indicates branches with ML BS = 100% and PP values = 1.0. Branch support of nodes ≥ 70 % ML BS and ≥ 0.90 PP is indicated above or below branches.
Figure 1 from: Vohník M, Borovec O, Kolaříková Z, Sudová R, Réblová M (2019) Extensive sampling and high-throughput sequencing reveal Posidoniomyces atricolor gen. et sp. nov. (Aigialaceae, Pleosporales) as the dominant root mycobiont of the dominant Mediterranean seagrass Posidonia oceanica. MycoKeys 55: 59-86. https://doi.org/10.3897/mycokeys.55.35682
Figure 1 The dominant Mediterranean seagrass Posidoniaoceanica. a Overall appearance, note dense branched root system of the seagrass (encircled) bPosidoniaoceanica growing on an approx. 1.5 m thick layer of matte c typical habitat of the dominant Mediterranean seagrass, note the layer of shed seagrass leaves on the seabed.
Supplementary material 1 from: Vohník M, Borovec O, Kolaříková Z, Sudová R, Réblová M (2019) Extensive sampling and high-throughput sequencing reveal Posidoniomyces atricolor gen. et sp. nov. (Aigialaceae, Pleosporales) as the dominant root mycobiont of the dominant Mediterranean seagrass Posidonia oceanica. MycoKeys 55: 59-86. https://doi.org/10.3897/mycokeys.55.35682
: Data type: species data
Posidonia oceanica meadows (1120) Atokos island
<p>This layer has derived from a habitat classification using satellite imagery and ground truthing<br>data, in the context of "Protecting the Inner Ionian Archipelago and Formicula island" project.<br>The project was implemented by iSea and funded by Blue Marine Foundation the mapping was<br>produced in collaboration with terraSolutions mer. More detailed info on the product and appropriate citation can be found here:<br>https://zenodo.org/doi/10.5281/zenodo.12672634</p>
A king and vassals’ tale: molecular signatures of clonal integration in Posidonia oceanica under chronic light shortage
Open the record for dataset details and reuse information.
Figure 2 from: Gnisci V, Cognetti de Martiis S, Belmonte A, Micheli C, Piermattei V, Bonamano S, Marcelli M (2020) Assessment of the ecological structure of Posidonia oceanica (L.) Delile on the northern coast of Lazio, Italy (central Tyrrhenian, Mediterranean). Italian Botanist 9: 1-19. https://doi.org/10.3897/italianbotanist.9.46426
Figure 2 UPGMA analysis of Posidonia oceanica meadows.
Sounds of fishes in a Posidonia seagrass meadow (Ustica Island, 1999)
<p>These fish sound recordings are issued from the original acoustic dataset of USTICA 99 experiment described in:</p> <p>Chapter 5. Acoustic Remote Sensing of Photosynthetic Activity in Seagrass Beds</p> <p>Jean-Pierre Hermand</p> <p>Handbook of Scaling Methods in Aquatic Ecology<br> Measurement, Analysis, Simulation<br> Edited by Peter G. Strutton and Laurent Seuront<br> CRC Press 2003<br> Pages 65–96<br> Print ISBN: 978-0-8493-1344-8<br> eBook ISBN: 978-0-203-48955-0<br> DOI: 10.1201/9780203489550.ch5</p> <p> </p>
Fig. 1 in Specialized compounds across ontogeny in the seagrass Posidonia oceanica
Fig. 1. Chemical structures of the five compounds (1–5) detected in Posidonia oceanica.
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