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Giulia Caneva - One of the best experts on this subject based on the ideXlab platform.
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photosynthetic response to different light exposures and associated environmental conditions of the subaerial epilithic green alga Trentepohlia umbrina chlorophyta ulvophyceae
Phycologia, 2021Co-Authors: Laura Bruno, Neil Thomas William Ellwood, Giulia CanevaAbstract:The potentially biodeteriogenic, subaerial green alga Trentepohlia umbrina is widely distributed on shaded substrates with northern aspects. This preference for low light was confirmed by a recent ...
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Exploring ecological relationships in the biodeterioration patterns of Angkor temples (Cambodia) along a forest canopy gradient
Journal of Cultural Heritage, 2015Co-Authors: Giulia Caneva, Flavia Bartoli, Simona Ceschin, O. Salvadori, Yoko Futagami, Luca SalvatiAbstract:Abstract Various biological communities colonize the Khmer temples in Angkor (Cambodia), which had lain abandoned for many centuries. These biodeterioration patterns change in response to different environmental conditions, and the aim of this study is to quantify their frequency and ecological characteristics according to a forest canopy gradient. The descriptive and multivariate statistical analysis applied to data collected from the four temples in the study identifies various biological communities along with a temple-specific ecological succession. The initial pioneer community is primarily composed of a reddish biofilm of the green alga Trentepohlia sp., and it occurs in xeric and shady environmental conditions, becoming dominant in forested areas. Cyanobacteria biofilm, consisting of species belonging to the genera Scytonema and Gloeocapsa , sometimes in combination with the lichen Endocarpon sp., prevails in xeric and sunny conditions. With the progressive increase of the availability of edaphic water, typical of forested areas, various lichen communities are able to establish themselves (dominated by Lepraria , Pyxine coralligera and Cryptothecia subnidulans respectively), followed by moss and higher plant communities. Understanding these relationships appears to be a very useful way of identifying the best microclimatic conditions for stone conservation.
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biological colonization patterns on the ruins of angkor temples cambodia in the biodeterioration vs bioprotection debate
International Biodeterioration & Biodegradation, 2014Co-Authors: Flavia Bartoli, Yoko Futagami, Casanova A Municchia, H Kashiwadani, K H Moon, Giulia CanevaAbstract:The biological colonization present on the temples of the UNESCO World Heritage site of Angkor is wide and relevant, but a debate on its biodeteriorative and bioprotective effects is now developing. We investigated the biological patterns observed on two temples (Ta Nei and Ta Keo) exposed to different microclimatic conditions, in order to assess the damage caused by the communities present on the stone. We analyzed the penetration (depth and spread) into the stone, and the degree of decohesion of seven communities (green algae, cyanobacteria, lichens and mosses). The microscopic analyses highlighted a clear interaction between organism and stone, displaying a trend of increasing harmfulness from the community of the green algae (Trentepohlia) up to the moss communities. All the lichen communities show biodeterioration abilities: the Pyxine community seems more aggressive than the Lepraria and Cryptothecia communities, and more also than the cyanobacterial communities. The positive effects of the lichen cover in reducing dangerous evaporation processes cannot outweigh the negative effects of their hyphal penetration. Light forest cover seems beneficial for the conservation of the Angkor monuments since it reduces evaporation processes, but further studies should be carried out so as to find an optimal balance between contrasting factors.
Fabio Rindi - One of the best experts on this subject based on the ideXlab platform.
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dna cloning demonstrates high genetic heterogeneity in populations of the subaerial green alga Trentepohlia Trentepohliales chlorophyta
Journal of Phycology, 2019Co-Authors: Michala Klimesova, Fabio Rindi, Pavel SkaloudAbstract:Mats of the green alga Trentepohlia, a genus widely distributed in the tropics as well as temperate regions, have always been perceived as homogeneous (i.e., formed by only one species). As such, their general nature and specific feature play a supportive role in the species delimitation. However, the presence of morphologically dissimilar thalli was observed under the light microscope and when cultivating a piece of a single mat. To address this, we performed DNA cloning of the rbcL gene on mat fragments of T. abietina, T. annulata, T. jolithus and T. umbrina sampled in Europe to reveal if they are composed of one or more species. We revealed that more Trentepohlia haplotypes may coexist in a single mat. In consideration of this, we conclude that the use of material isolated in unialgal culture will be almost mandatory for a taxonomic reassessment of this complicated genus. Another direct implication of this problem is that herbarium specimens consisting of field-collected material should not be used for direct sequencing. We further hypothesize the reasons why multiple haplotypes of Trentepohlia occur more frequently in the tuft-like mats. Possibly, fragments and/or cells of other microalgae, including other species of Trentepohlia, might be retained in such mats more easily than in the crustose Trentepohlialean mats.
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the identity of Trentepohlia algae chlorophyta Trentepohliales from point lobos state reserve and the san francisco region california
Madroño, 2018Co-Authors: Fabio Rindi, James Sikes, Leo ShapiroAbstract:Abstract Terrestrial chlorophyte algae of the order Trentepohliales are found in humid habitats around the world. Although most diverse and abundant in the tropics, on a global scale the group is nearly cosmopolitan. The most distinctive macroscopic trait of the Trentepohliales is their orange, golden, or red color, which is due to the accumulation of carotenoid pigments. Orange algae of the genus Trentepohlia, the most species-rich genus in the order, can be found growing on trees, rocks, and other substrates along the Pacific Coast of the United States, including the San Francisco Bay region. Perhaps the best known site for these algae is at Point Lobos State Reserve in Carmel, CA. The orange algae at this site are often referred to by California naturalists as “Trentepohlia aurea” or “Trentepohlia aurea var. polycarpa”. Given the challenges in identifying species in this genus and some confusion about nomenclature, we sampled Trentepohlia at Point Lobos and elsewhere in the region to clarify the identi...
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Phylogenetic position and morphology of lichenized Trentepohliales (Ulvophyceae, Chlorophyta) from selected species of Graphidaceae
Phycological Research, 2014Co-Authors: Christina Hametner, Fabio Rindi, Elfie Stocker-wörgötter, Martin GrubeAbstract:Summary The order Trentepohliales comprises a diverse and widespread group of green algae in temperate and tropical regions. The free-living representatives of this order have been investigated in more detail, whereas less is known about the Trentepohlialean photobionts of lichens. Selected lichen species of the family Graphidaceae (Graphis propinqua, Graphis scripta, Graphis submarginata) from different climatic regions were chosen for the isolation of Trentepohlialean photobionts. Three different nutrient media (modified Bold's Basal medium, modified Woods Hole MBL medium, optimal Haematococcus medium) were tested for the cultivation of these algae. The differences of the growth reactions of the isolated photobionts in culture were studied examining morphological characteristics, reproductive strategies and variations in carotenoid accumulation. The phylogenetic positions of the photobionts were investigated using sequences of the 18S rRNA gene, ITS region, and rbcL gene. Three photobiont strains were identified as Printzina lagenifera and one as Trentepohlia sp. according to the phylogenetic data and the morphological observations under culture conditions.
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Biodiversity of Trentepohliales (Ulvophyceae, Chlorophyta) in Gabon, Central Africa
Nova Hedwigia, 2013Co-Authors: Haj A. Allali, Fabio Rindi, Juan M. López-bautistaAbstract:The distribution and diversity of the algae of the order Trentepohliales were studied from field collections made in Gabon, central Africa. Both forest and urban environments were examined for the presence of Trentepohlialean taxa. Based on these field collections fourteen taxa of Trentepohlia and Printzina were recorded: Printzina bosseae (De Wildeman) Thompson & Wujek, Printzina lagenifera (Hildebrand) Thompson & Wujek, Printzina sp., Trentepohlia abietina (Flotow) Hansgirg, Trentepohlia abietina var. corrugata (Leighton) Cribb, Trentepohlia arborum (C.Agardh) Hariot, Trentepohlia aurea (Linnaeus) Martius, Trentepohlia chapmanii Rindi & Lopez-Bautista, Trentepohlia dusenii Hariot, Trentepohlia cfr. flintii Sarma, Trentepohlia minima Schmidle, Trentepohlia peruana (Kutzing) Printz, Trentepohlia rigidula (J.Muller) Hariot, Trentepohlia umbrina (Kutzing) Bornet. Among these taxa, five are reported here for the first time from Africa: P. bosseae, T. abietina var. corrugata, T. chapmanii, T. minima and T. peruana. An undescribed Printzina species was collected from "Les Monts de Cristal" forest for which more collections and an assessment based on molecular data are needed to assess the identity in detail. These findings suggest that microbial diversity in Africa is still grossly understudied, and future biodiversity surveys of subaerial algae may lead to the discovery of new and undescribed Trentepohlialean species.
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phylogenetic relationships and species circumscription in Trentepohlia and printzina Trentepohliales chlorophyta
Molecular Phylogenetics and Evolution, 2009Co-Authors: Fabio Rindi, Daryl W Lam, Juan M LopezbautistaAbstract:Subaerial green microalgae represent a polyphyletic complex of organisms, whose genetic diversity is much higher than their simple morphologies suggest. The order Trentepohliales is the only species-rich group of subaerial algae belonging to the class Ulvophyceae and represents an ideal model taxon to investigate evolutionary patterns of these organisms. We studied phylogenetic relationships in two common genera of Trentepohliales (Trentepohlia and Printzina) by separate and combined analyses of the rbcL and 18S rRNA genes. Trentepohlia and Printzina were not resolved as monophyletic groups. Three main clades were recovered in all analyses, but none corresponded to any Trentepohlialean genus as defined based on morphological grounds. The rbcL and 18S rRNA datasets provided congruent phylogenetic signals and similar topologies were recovered in single-gene analyses. Analyses performed on the combined 2-gene dataset inferred generally higher nodal support. The results clarified several taxonomic problems and showed that the evolution of these algae has been characterized by considerable morphological convergence. Trentepohlia abietina and T. flava were shown to be separate species from T. aurea; Printzina lagenifera, T. arborum and T. umbrina were resolved as polyphyletic taxa, whose vegetative morphology appears to have evolved independently in separate lineages. Incongruence between phylogenetic relationships and traditional morphological classification was demonstrated, showing that the morphological characters commonly used in the taxonomy of the Trentepohliales are phylogenetically irrelevant.
Morio Hirano - One of the best experts on this subject based on the ideXlab platform.
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removal of inorganic nitrogen sources from water by the algal biofilm of the aerial microalga Trentepohlia aurea
World Journal of Microbiology & Biotechnology, 2003Co-Authors: Katsuya Abe, Atsue Imamaki, Ikue Matsumura, Morio HiranoAbstract:Removal of inorganic nitrogen sources by cells of the aerial microalga Trentepohlia aurea grown on the surface of substrate, such as filter paper, has been investigated in a batch system. When the alga grew on the paper dampened with medium, it actively ingested inorganic nitrogenous compounds in the medium. Immobilized cells on the filter papers were called ‘algal biofilm’ in this study. When the algal biofilms were soaked in modified Bold's Basal medium (using 1 g NH4Cl l−1 as a N source), the removal rate was 4.25 mg ammonium-N l−1 day−1 in 40 days. In modified medium with added 26 mg nitrite-N, the removal rate of the total inorganic N ion by the biofilms reached 5.11 mg N l−1 day−1. This removal rate of total N ion was higher than that in the medium by addition of 26 mg nitrate-N. In addition, we tried to examine simultaneous removal of ammonium, nitrate, and nitrite ions and growth inhibition of cyanobacteria in the medium by using the algal biofilms. Consequently, it was demonstrated that the algal biofilms of T. aurea could be utilized as a biofunctional material for the purification of wastewater.
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removal of nitrate nitrite ammonium and phosphate ions from water by the aerial microalga Trentepohlia aurea
Journal of Applied Phycology, 2002Co-Authors: Katsuya Abe, Atsue Imamaki, Morio HiranoAbstract:The aerial microalga Trentepohlia aurea has beeninvestigated in relation to removal characteristics of nitrate, nitrite,ammonium and phosphate ions. When the alga was cultured in medium with veryhighconcentrations of ammonium, nitrate and phosphate ions, it showed relativelyhigh growth and removal rates. It also grew quite well with high nitriteconcentration (< 141 mg NO2-N L−1).The removal rate was 0.28 mg NO2-N L−1day−1 in the 40-day culture, when it was cultured in modifiedBold's basal medium with added 51 mg NO2-NL−1. In addition, we examined simultaneous removal of nutrientions. The biomass was 1.5 times higher in medium which N- and P-sourcesufficient than in ordinary medium. Higher removal ratios of nitrite andnitratefrom medium were shown in a 30-day culture, reaching 37% and 32%, respectively.It is concluded that T. aurea has the potential for use inthe purification of wastewater.
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Simultaneous production of β-carotene, vitamin E and vitamin C by the aerial microalga Trentepohlia aurea
Journal of Applied Phycology, 1999Co-Authors: Nanae Nishimura, Morio HiranoAbstract:The biomass production and antioxidant accumulation of the aerial microalga Trentepohlia aurea were examined. Using ammonium chloride as nitrogen source for growth in liquid medium, the growth rate was exponential and accompanied by a marked fall in the pH of the medium. The highest growth rate of 152 mg L^-1 day^-1 (logarithmic phase) was attained when T. aurea was cultured with aeration of 5% CO_2-enriched air in medium buffered with HEPES. The growth rate and antioxidant content were enhanced under 5% CO_2 by switching the light intensity from 43 to 143 μmol photon m^-2 s^-1 for the two-stage culture. As a result, T. aurea cells accumulated 2.1 mg β-carotene, 0.3 mg L-ascorbic acid and 2.4 mg tocopherols, respectively, per g dry cell. The simultaneous production of useful materials, such as β-carotene, vitamin E and vitamin C, was demonstrated.
Huan Zhu - One of the best experts on this subject based on the ideXlab platform.
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Characterization of the Chloroplast Genome of Trentepohlia odorata (Trentepohliales, Chlorophyta), and Discussion of its Taxonomy
MDPI AG, 2019Co-Authors: Huan Zhu, Feng Liu, Guoxiang LiuAbstract:Trentepohliales is an aerial order of Chlorophyta with approximately 80 species distributed mainly in tropical and subtropical regions. The taxonomy of this genus is quite difficult and presents a challenge for many phycologists. Although plentiful molecular data is available, most of the sequences are not identified at the species level. In the present study, we described a new specimen with detailed morphological data and identified it as Trentepohlia odorata. A phylogenetic analysis showed T. odorata as a novel lineage in Trentepohliales. T. odorata has the closest relationship with T. annulata, which is expected since sporangia of both species are without stalk cell and with dorsal pore. Species with such morphological characteristics may represent deep lineages in Trentepohliales. Although an increasing number of chloroplast genomes of Ulvophyceae have been reported in recent years, the whole plastome of Trentepohliales has not yet been reported. Thus, the chloroplast genome of Trentepohlia odorata was reported in the present study. The whole plastome was 399,372 bp in length, with 63 predicted protein-coding genes, 31 tRNAs, and 3 rRNAs. Additionally, we annotated 95 free-standing open reading frames, of which seven were annotated with plastid origins, 16 with eukaryotic genome origins, and 33 with bacterial genome origins. Four rpo genes (rpoA, rpoB, rpoC1, and rpoC2) were annotated within ORF clusters. These four genes were fragmented into several (partial) ORFs by in-frame stop codons. Additionally, we detected a frame shift mutation in the rpoB gene. The phylogenetic analysis supported that Trentepohliales clustered with Dasycladales and nested into the BDT clade (Bryopsidales, Dasycladales and Trentepohliales). Our results present the first whole chloroplast genome of a species of Trentepohliales and provided new data for understanding the evolution of the chloroplast genome in Ulvophyceae
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Phylogram inferred from ML analysis of ITS rDNA sequences in the Trentepohliales (obtained with RAxML, ln(L) = -8559.5).
2015Co-Authors: Huan Zhu, Zhijuan Zhao, Shuang Xia, Guoxiang LiuAbstract:Numbers indicate branches highly supported under all inference methods (>50% BP, >0.5 PP). The clades of core Trentepohlia, Cephaleuros, Printzina and Phycopeltis were colored in red, green, blue and orange respectively. The Phycopeltis prostrata were shaded in cyan and Trentepohlia annulata group were shaded in grey.
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Phylogram inferred from ML analysis of SSU rDNA sequences in the Trentepohliales (obtained with RAxML, ln(L) = -4975.4).
2015Co-Authors: Huan Zhu, Zhijuan Zhao, Shuang Xia, Guoxiang LiuAbstract:Numbers indicate branches highly supported under all inference methods (>50% BP, >0.5 PP). The caldes of core Trentepohlia, Cephaleuros, Printzina and Phycopeltis were colored in red, green, blue and orange respectively. The previous Phycopeltis sequence (Genbank no. AY052570) was shaded in pink, the Phycopeltis prostrata was shaded in cyan and Trentepohlia annulata group were shaded in grey.
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The filamentous of Trentepohlia jolithus var. yajiagengensis var. nov. 3A:
2013Co-Authors: Guoxiang Liu, Qi Zhang, Huan ZhuAbstract:A small piece of gravel covered with Trentepohlia under the stereoscope; 3B: Trentepohlia-carpet under the stereoscope; 3C: Primary filaments of Trentepohlia creeping on a stone surface; 3D: Tangle filaments of Trentepohlia with irregular prostrate cells; 3E-3G: Erect filaments of Trentepohlia. All scale bars = 100 µm.
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Red-Stone-Valley and the stones covered with Trentepohlia-carpets.
2013Co-Authors: Guoxiang Liu, Qi Zhang, Huan ZhuAbstract:2A-2B: Red-stone Valley and the Yajiageng River; 2C: Red Trentepohlia-carpet in a cold winter; 2D: Trentepohlia growing on stone walls near the road; 2E: Red-Stone-Valley and Yajiageng River; 2F-2G: Red-Stone-Valley in foggy conditions; 2H: Tibetan Ni-ma stack with Trentepohlia growing on it. 2I: Red-Stone-Valley in winter.
Neil Thomas William Ellwood - One of the best experts on this subject based on the ideXlab platform.
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photosynthetic response to different light exposures and associated environmental conditions of the subaerial epilithic green alga Trentepohlia umbrina chlorophyta ulvophyceae
Phycologia, 2021Co-Authors: Laura Bruno, Neil Thomas William Ellwood, Giulia CanevaAbstract:The potentially biodeteriogenic, subaerial green alga Trentepohlia umbrina is widely distributed on shaded substrates with northern aspects. This preference for low light was confirmed by a recent ...