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Chuner Cai - One of the best experts on this subject based on the ideXlab platform.
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Comparative study on mitogenomes of Green Tide algae.
Genetica, 2018Co-Authors: Chuner Cai, Feng Liu, Ting Jiang, Lingke Wang, Rui Jia, Lingjie Zhou, Jianfeng RenAbstract:Since 2007, the annual Green Tide disaster in the Yellow Sea has brought serious economic losses to China. There is no research on the genetic similarities of four constituent species of Green Tide algae at the genomic level. We previously determined the mitochondrial genomes of Ulva prolifera, Ulva linza and Ulva flexuosa. In the present work, the mitochondrial genome of another Green Tide (Ulva compressa) was sequenced and analyzed. With the length of 62,311 bp, it contained 29 encoding genes, 26 tRNAs and 10 open reading frames. By comparing these four mitochondrial genomes, we found that U. compressa was quite different from the other three types of Ulva species. However, there were similarities between U. prolifera and U. linza in the number, distribution and homology of open reading frames, evolutionary and codon variation of tRNA, evolutionary relationship and selection pressure of coding genes. Repetitive sequence analysis of simple sequence repeats, tandem repeat and forward repeats further supposed that they have evolved from the same origin. In addition, we directly analyzed gene homologies and translocation of four Green Tide algae by Mauve alignment. There were gene order rearrangements among them. With fast-evolving genomes, these four Green algal mitochondria have both conservatism and variation, thus opening another window for the understanding of origin and evolution of Ulva.
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complete chloroplast genome of Green Tide algae ulva flexuosa ulvophyceae chlorophyta with comparative analysis
PLOS ONE, 2017Co-Authors: Chuner Cai, Lingke Wang, Lingjie Zhou, Binghua JiaoAbstract:Ulva flexuosa, one kind of Green Tide algae, has outbroken in the Yellow Sea of China during the past ten years. In the present study, we sequenced the chloroplast genome of U. flexuosa followed by annotation and comparative analysis. It indicated that the chloroplast genomes had high conservation among Ulva spp., and high rearrangement outside them. Though U. flexuosa was closer to U. linza than U. fasciata in phylogenetic tree, the average Ka/Ks between U. flexuosa and U. linza assessed by 67 protein-coding genes was higher than those between U. flexuosa and other species in Ulva spp., due to the variation of psbZ, psbM and ycf20. Our results laid the foundation for the future studies on the evolution of chloroplast genomes of Ulva, as well as the molecular identification of U. flexuosa varieties.
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The complete mitochondrial genomes of Green Tide algae Ulva flexuosa (Ulvophyceae, Chlorophyta).
Conservation Genetics Resources, 2017Co-Authors: Chuner Cai, Ting Jiang, Lingke Wang, Lingjie Zhou, Binghua JiaoAbstract:Ulva flexuosa, one kind of Green Tide algae, has outbroken in the Yellow Sea of China during the past 10 years. The blooms have now become the world’s largest Green Tide, making great disaster for the ecosystem. In the present study, we sequenced the mitochondrial genome of U. flexuosa for the first time (GenBank Accession Number KX455878). It was found that the annular-shape genome was made up of 71545 bases pairs, including 29 protein coding genes. We then aligned amino acid of chlorophyta species containing the 29 genes in series as cladogram, which shows U. flexuosa is the closest sister species of U. fasciata, U. prolifera and U. linza.
Lingjie Zhou - One of the best experts on this subject based on the ideXlab platform.
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Comparative study on mitogenomes of Green Tide algae.
Genetica, 2018Co-Authors: Chuner Cai, Feng Liu, Ting Jiang, Lingke Wang, Rui Jia, Lingjie Zhou, Jianfeng RenAbstract:Since 2007, the annual Green Tide disaster in the Yellow Sea has brought serious economic losses to China. There is no research on the genetic similarities of four constituent species of Green Tide algae at the genomic level. We previously determined the mitochondrial genomes of Ulva prolifera, Ulva linza and Ulva flexuosa. In the present work, the mitochondrial genome of another Green Tide (Ulva compressa) was sequenced and analyzed. With the length of 62,311 bp, it contained 29 encoding genes, 26 tRNAs and 10 open reading frames. By comparing these four mitochondrial genomes, we found that U. compressa was quite different from the other three types of Ulva species. However, there were similarities between U. prolifera and U. linza in the number, distribution and homology of open reading frames, evolutionary and codon variation of tRNA, evolutionary relationship and selection pressure of coding genes. Repetitive sequence analysis of simple sequence repeats, tandem repeat and forward repeats further supposed that they have evolved from the same origin. In addition, we directly analyzed gene homologies and translocation of four Green Tide algae by Mauve alignment. There were gene order rearrangements among them. With fast-evolving genomes, these four Green algal mitochondria have both conservatism and variation, thus opening another window for the understanding of origin and evolution of Ulva.
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complete chloroplast genome of Green Tide algae ulva flexuosa ulvophyceae chlorophyta with comparative analysis
PLOS ONE, 2017Co-Authors: Chuner Cai, Lingke Wang, Lingjie Zhou, Binghua JiaoAbstract:Ulva flexuosa, one kind of Green Tide algae, has outbroken in the Yellow Sea of China during the past ten years. In the present study, we sequenced the chloroplast genome of U. flexuosa followed by annotation and comparative analysis. It indicated that the chloroplast genomes had high conservation among Ulva spp., and high rearrangement outside them. Though U. flexuosa was closer to U. linza than U. fasciata in phylogenetic tree, the average Ka/Ks between U. flexuosa and U. linza assessed by 67 protein-coding genes was higher than those between U. flexuosa and other species in Ulva spp., due to the variation of psbZ, psbM and ycf20. Our results laid the foundation for the future studies on the evolution of chloroplast genomes of Ulva, as well as the molecular identification of U. flexuosa varieties.
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The complete mitochondrial genomes of Green Tide algae Ulva flexuosa (Ulvophyceae, Chlorophyta).
Conservation Genetics Resources, 2017Co-Authors: Chuner Cai, Ting Jiang, Lingke Wang, Lingjie Zhou, Binghua JiaoAbstract:Ulva flexuosa, one kind of Green Tide algae, has outbroken in the Yellow Sea of China during the past 10 years. The blooms have now become the world’s largest Green Tide, making great disaster for the ecosystem. In the present study, we sequenced the mitochondrial genome of U. flexuosa for the first time (GenBank Accession Number KX455878). It was found that the annular-shape genome was made up of 71545 bases pairs, including 29 protein coding genes. We then aligned amino acid of chlorophyta species containing the 29 genes in series as cladogram, which shows U. flexuosa is the closest sister species of U. fasciata, U. prolifera and U. linza.
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adaptability of free floating Green Tide algae in the yellow sea to variable temperature and light intensity
Marine Pollution Bulletin, 2015Co-Authors: Jianjun Cui, Lingjie Zhou, Jianheng Zhang, Yuanzi Huo, Liping ChenAbstract:In this study, the influence of temperature and light intensity on the growth of seedlings and adults of four species of Green Tide algae (Ulvaprolifera, Ulvacompressa, Ulva flexuosa and Ulvalinza) from the Yellow Sea was evaluated. The results indicated that the specific growth rate (SGR) of seedlings was much higher than that of adults for the four species. The adaptability of U. prolifera is much wider: Adult daily SGRs were the highest among the four species at 15-20 °C with 10-600 μmol · m(-2) · s(-1) and 25-30 °C with 200-600 μmol · m(-2) · s(-1). SGRs were 1.5-3.5 times greater than the other three species at 15-25 °C with 200-600 μmol · m(-2) · s(-1). These results indicate that U. prolifera has better tolerance to high temperature and light intensity than the other three species, which may in part explain why only U. prolifera undergoes large-scale outbreaks and floats to the Qingdao coast while the other three species decline and disappear at the early stage of blooming.
Guang Gao - One of the best experts on this subject based on the ideXlab platform.
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Combination of ocean acidification and warming enhances the competitive advantage of Skeletonema costatum over a Green Tide alga, Ulva linza.
Harmful algae, 2019Co-Authors: Guang Gao, John BeardallAbstract:Abstract Red Tide and Green Tide are two common algal blooms that frequently occur in many areas in the global oceans. The algae causing red Tide and Green Tide often interact with each other in costal ecosystems. However, little is known on how future CO2-induced ocean acidification combined with temperature variation would affect the interaction of red and Green Tides. In this study, we cultured the red Tide alga Skeletonema costatum and the Green Tide alga Ulva linza under ambient (400 ppm) and future CO2 (1000 ppm) levels and three temperatures (12, 18, 24 °C) in both monoculture and coculture systems. Coculture did not affect the growth rate of U. linza but significantly decreased it for S. costatum. Elevated CO2 relieved the inhibitory effect of U. linza on the growth of S. costatum, particularly for higher temperatures. At elevated CO2, higher temperature increased the growth rate of S. costatum but reduced it for U. linza. Coculture with U. linza reduced the net photosynthetic rate of S. costatum, which was relieved by elevated CO2. This pattern was also found in Chl a content, indicating that U. linza may inhibit growth of S. costatum via harming pigment synthesis and thus photosynthesis. In monoculture, higher temperature did not affect respiration rate of S. costatum but increased it in U. linza. Coculture did not affect respiration of U. linza but stimulated it for S. costatum, which was a signal of responding to biotic and/abiotic stress. The increased growth of S. costatum at higher temperature and decreased inhibition of U. linza on S. costatum at elevated CO2 suggest that red Tides may have more advantages over Green Tides in future warmer and CO2-enriched oceans.
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ocean acidification and nutrient limitation synergistically reduce growth and photosynthetic performances of a Green Tide alga ulva linza
Biogeosciences, 2018Co-Authors: Guang Gao, John Beardall, Menglin Bao, Can Wang, Wangwang RenAbstract:Abstract. Large-scale Green Tides have been invading the coastal zones of the western Yellow Sea annually since 2008. Meanwhile, oceans are becoming more acidic due to continuous absorption of anthropogenic carbon dioxide, and intensive seaweed cultivation in Chinese coastal areas is leading to severe regional nutrient limitation. However, little is known about the combined effects of global and local stressors on the eco-physiology of bloom-forming algae. We cultured Ulva linza for 9–16 days under two levels of pCO2 (400 and 1000 µatm) and four treatments of nutrients (nutrient repletion, N limitation, P limitation, and N–P limitation) to investigate the physiological responses of this Green Tide alga to the combination of ocean acidification and nutrient limitation. For both sporelings and adult plants, elevated pCO2 did not affect the growth rate when cultured under nutrient-replete conditions but reduced it under P limitation; N or P limitations by themselves reduced growth rate. P limitation resulted in a larger inhibition in growth for sporelings compared to adult plants. Sporelings under P limitation did not reach the mature stage after 16 days of culture while those under P repletion became mature by day 11. Elevated pCO2 reduced net photosynthetic rate for all nutrient treatments but increased nitrate reductase activity and soluble protein content under P-replete conditions. N or P limitation reduced nitrate reductase activity and soluble protein content. These findings indicate that ocean acidification and nutrient limitation would synergistically reduce the growth of Ulva species and may thus hinder the occurrence of Green Tides in a future ocean environment.
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expected co2 induced ocean acidification modulates copper toxicity in the Green Tide alga ulva prolifera
Environmental and Experimental Botany, 2017Co-Authors: Guang Gao, Yameng Liu, Zhihua FengAbstract:Abstract Cu is considered to be toxic to macroalgae at higher levels. Ocean acidification can also alter the physiological performances of macroalgae. However, little is known regarding the interactive effects of Cu and ocean acidification on macroalgae. In this study, a Green Tide macroalga, Ulva prolifera , was cultured at the conditions of three levels of Cu (control, 0.5 μM, and 2 μM) and pCO 2 (ambient, 1000 μatm, and 1400 μatm) to investigate the responses of U. prolifera to interaction of Cu exposure and ocean acidification. The relative growth rate of thalli decreased with the rise of Cu for all pCO 2 conditions except the 1000 μatm pCO 2 . Compared with the control, 2 μM Cu reduced the net photosynthetic rate for all pCO 2 conditions while 0.5 μM Cu only reduced it at 1400 μatm pCO 2 . The inhibition rate of Cu on the relative growth rate and net photosynthetic rate was reduced at 1000 μatm pCO 2 but was magnified at 1400 μatm pCO 2 . Contrary to growth, the dark respiration rate was enhanced by 0.5 μM Cu at ambient pCO 2 and by 2 μM Cu at ambient and 1000 μatm pCO 2 , although it was reduced by 2 μM Cu at 1400 μatm pCO 2 compared to the control. The 0.5 μM Cu did not affect the relative electron transport rate (rETR) for any pCO 2 condition but 2 μM Cu decreased it for all pCO 2 conditions except 1000 μatm pCO 2 . The mute effect of 0.5 μM Cu on the net photosynthetic rate and rETR at ambient pCO 2 may be due to more Chl a and Chl b being synthesized. In addition, 2 μM Cu and 1400 μatm pCO 2 led to branched thalli, which may be a defense mechanism against the stress of high Cu and pCO 2 . Our data, for the first time, demonstrate that a modest increase of pCO 2 can alleviate the toxicity of Cu to U. prolifera whilst a further increase exacerbates it. U. prolifera can respond to the stress of Cu pollution and ocean acidification via physiological and morphological alterations.
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An Ocean Acidification Acclimatised Green Tide Alga Is Robust to Changes of Seawater Carbon Chemistry but Vulnerable to Light Stress
PLOS ONE, 2016Co-Authors: Guang Gao, Yameng Liu, Xinshu Li, Zhihua Feng, Juntian XuAbstract:Ulva is the dominant genus in the Green Tide events and is considered to have efficient CO2 concentrating mechanisms (CCMs). However, little is understood regarding the impacts of ocean acidification on the CCMs of Ulva and the consequences of thalli's acclimation to ocean acidification in terms of responding to environmental factors. Here, we grew a cosmopolitan Green alga, Ulva linza at ambient (LC) and elevated (HC) CO2 levels and investigated the alteration of CCMs in U. linza grown at HC and its responses to the changed seawater carbon chemistry and light intensity. The inhibitors experiment for photosynthetic inorganic carbon utilization demonstrated that acidic compartments, extracellular carbonic anhydrase (CA) and intracellular CA worked together in the thalli grown at LC and the acquisition of exogenous carbon source in the thalli could be attributed to the collaboration of acidic compartments and extracellular CA. Contrastingly, when U. linza was grown at HC, extracellular CA was completely inhibited, acidic compartments and intracellular CA were also down-regulated to different extents and thus the acquisition of exogenous carbon source solely relied on acidic compartments. The down-regulated CCMs in U. linza did not affect its responses to changes of seawater carbon chemistry but led to a decrease of net photosynthetic rate when thalli were exposed to increased light intensity. This decrease could be attributed to photodamage caused by the combination of the saved energy due to the down-regulated CCMs and high light intensity. Our findings suggest future ocean acidification might impose depressing effects on Green Tide events when combined with increased light exposure.
Masanori Hiraoka - One of the best experts on this subject based on the ideXlab platform.
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Mitochondrial and chloroplast genome sequences of Ulva ohnoi, a Green-Tide-forming macroalga in the Southern coastal regions of Japan.
Mitochondrial DNA. Part B Resources, 2018Co-Authors: Shigekatsu Suzuki, Masanori Hiraoka, Haruyo Yamaguchi, Masanobu KawachiAbstract:Ulva is a Green macroalga often causing a macroalgal bloom, ‘Green Tide’. Ulva ohnoi is a major species composing the Green Tide of the southern coastal regions of Japan. Here, we sequenced the com...
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Persistent occurrence of floating Ulva Green Tide in Hiroshima Bay, Japan: seasonal succession and growth patterns of Ulva pertusa and Ulva spp. (Chlorophyta, Ulvales)
Hydrobiologia, 2015Co-Authors: Goro Yoshida, Masayuki Uchimura, Masanori HiraokaAbstract:Since the late 1980’s, a persistent Green Tide of floating Ulva without any clear seasonal fluctuation has occurred in Hiroshima Bay, Seto Inland Sea, Japan. We hypothesized that the persistence is due to the co-existence of Ulva species with different seasonal growth patterns, and monitored the seasonal composition and growth characteristics of the constituent Ulva within the Green Tide. Two morphological types of Ulva were identified, and one type, U. pertusa , was almost the sole constituent during winter and spring. The other type Ulva spp., which has marginal microscopic serrations on the thallus, was dominant during summer and autumn. Both Ulva showed the highest relative growth rate in early autumn, but growth of Ulva spp. was faster in summer than that of U. pertusa and inhibited in winter. U. pertusa had more eurythermal characteristics in which the growth rate remained relatively high in winter. Water temperature was the most correlated environmental variable for the seasonal growth of both Ulva types rather than light or nutrients, but more influential on Ulva spp. Recent increasing trend of ambient seawater temperature is considered to be favorable for the growth of both Ulva types and a causative factor of the Green Tide.
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Crossing test among floating Ulva thalli forming ‘Green Tide’ in Japan
Asian Pacific Phycology in the 21st Century: Prospects and Challenges, 2004Co-Authors: Masanori Hiraoka, Masao Ohno, Shigeo Kawaguchi, Goro YoshidaAbstract:Crossing tests were made to determine the relationship between the identified Ulva pertusa, which commonly grows in Japan as an attached form on exposed rocks, and the floating Ulva forming “Green Tide” inside calm bays. The floating Ulva thalli were collected from five major Green Tide sites in Japan (Yokohama, Mikawa, Miyajima, Kochi and Hakata). Reproductive maturation was induced in U. pertusa and the floating thalli from each site. Mating between induced gametes was observed. It is therefore believed that the floating thalli from Yokohama, Mikawa and Miyajima were mainly U. pertusa, while those from Kochi and Hakata were of a different species (Ulva sp.l). Furthermore, the Ulva species found in Mikawa is also a species (Ulvasp.2) different from both U. pertusa and Ulva sp.l.
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taxonomic and ecological profile of Green Tide species of ulva ulvales chlorophyta in central philippines
Hydrobiologia, 2004Co-Authors: Danilo B Largo, Masanori Hiraoka, Jose Sembrano, Masao OhnoAbstract:Ulva spp. are common in the intertidal zones of the Philippines, but, at certain times, could over-proliferate producing blooms or `Green Tide' in some protected bays. In Mactan Island (Cebu), central Philippines, at least two species constitute the Ulva population, either as free-living or attached form. The one referred to in the literature as `Ulva lactuca' mainly consists of free-living population while the species referred to as Ulva reticulata consists mainly of attached population. Based on morphological and physiological characteristics, `U. lactuca' differs much from the descriptions of the species from its type locality in Europe in having a crumpled texture of blade, presence of tooth-like protuberances at the margins, thinner thallus (40–50 μm) and more pyrenoids per cell (two to four). The species referred to as `U. lactuca' in the Philippines therefore is a different species. Two morphotypes consisted the `U. lactuca' population from Mactan – a thick thallus and a thin thallus type. However, both morphotypes cultured under the same condition in the laboratory could transform into the same thin-thallus type observed in the field. `Green Tide' caused by `U. lactuca' occur almost regularly in Station 1 of Mactan Island, reaching an average biomass of up to 2.6 kg wet wt m−2 (or 0.5 kg dry wt m−2). Ulva reticulata, although was less abundant in the rocky tidal zone at most times, reaching an average biomass of only up to 0.15 kg wet wt m−2 (or 0.03 kg dry wt m−2) had caused Green Tide in Station 2 around February–March. Reproductive structures were not observed in both Ulva species during the survey period suggesting that vegetative fragmentation is the main mode of propagation. Vegetative tissues excised from the thallus can be induced to release biflagellated large and small zooids.
Jin Zhao - One of the best experts on this subject based on the ideXlab platform.
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comparative genomics of pseudomonas sp strain si 3 associated with macroalga ulva prolifera the causative species for Green Tide in the yellow sea
Frontiers in Microbiology, 2018Co-Authors: Peng Jiang, Jin ZhaoAbstract:Algae-bacteria associations occurred widely in marine habitats, but contributions of bacteria to macroalgal blooming were almost unknown. In this study, a potential endophytic strain SI-3 was isolated from Ulva prolifera, the causative species for the world’s largest Green Tide in the Yellow Sea, following a strict bleaching treatment to eliminate epiphytes. The genomic sequence of SI-3 was determined in size of 4.8 Mb and SI-3 was found to be mostly closed to Pseudomonas stutzeri. To evaluate the characteristics of SI-3 as a potential endophyte, the genomes of SI-3 and other 20 P. stutzeri strains were compared. We found that SI-3 had more strain-specific genes than most of the 20 P. stutzeri strains. Clusters of Orthologous Groups (COGs) analysis revealed that SI-3 had the highest proportion of genes assigned to transcriptional regulation and signal transduction compared with the 20 P. stutzeri strains including four rhizosphere bacteria, indicating a complicated interaction network between SI-3 and its host. P. stutzeri is renowned for its metabolic versatility in aromatic compounds degradation. However, a significant gene loss was observed in several aromatic compounds degradation pathways in SI-3, which may be an evolutional adaptation when associate with its host. Dissimilatory nitrate reduction to ammonium (DNRA) and denitrification, two competing dissimilatory nitrate reduction pathways, co-occurred in the genome of SI-3, like most of the other 20 P. stutzeri strains, based on the KEGG analysis. We speculated DNRA of SI-3 may contribute competitive advantage in nitrogen acquisition of U. prolifera by conserving nitrogen in NH4+ form, like the case in microalga bloom. These data, collectively, suggested that Pseudomonas sp. strain SI-3 was a suitable candidate to study the algae-bacteria interaction with U. prolifera and the ecological impacts on algal blooming.
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The Yellow Sea Green Tide: A risk of macroalgae invasion.
Harmful algae, 2018Co-Authors: Jin Zhao, Ri Qiu, Peng Jiang, Huaxin ChenAbstract:Abstract Large scale Green Tides have bloomed successively in the Yellow Sea since 2007. The floating ecotype of Ulva prolifera, which is responsible for the environmental disaster, drifted a long distance during the blooming time and was exotic to the coastal area. The Yellow Sea Green Tide can be a potential source to incur bio-invasion. In this study, the distribution pattern and propagule pressure of the floating ecotype was investigated along the Qingdao coastline, which was seriously impacted by the Green Tide. Two out of 661 attached Ulva specimens collected in different seasons were identified as the floating ecotype by molecular markers, indicating that a few individuals of the floating ecotype had settled down, and their attached population could have spontaneously established. In seawater and sediments, the proportion of the floating ecotype in Ulva propagules reached up to 32% and 69% respectively when the floating algae was accumulating on seashore, which was a great propagule pressure to the local ecosystem. Results of the field test indicated that the available resources and the competition between the floating ecotype and the local Ulva species might be the main restrictions for settlement. Though the current scale of the established population is still small, the risk of biological invasion by the floating ecotype exists and it deserves more attention.
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Comparative Genomics of Pseudomonas sp. Strain SI-3 Associated With Macroalga Ulva prolifera, the Causative Species for Green Tide in the Yellow Sea
Frontiers Media S.A., 2018Co-Authors: Jin Zhao, Peng JiangAbstract:Algae-bacteria associations occurred widely in marine habitats, however, contributions of bacteria to macroalgal blooming were almost unknown. In this study, a potential endophytic strain SI-3 was isolated from Ulva prolifera, the causative species for the world's largest Green Tide in the Yellow Sea, following a strict bleaching treatment to eliminate epiphytes. The genomic sequence of SI-3 was determined in size of 4.8 Mb and SI-3 was found to be mostly closed to Pseudomonas stutzeri. To evaluate the characteristics of SI-3 as a potential endophyte, the genomes of SI-3 and other 20 P. stutzeri strains were compared. We found that SI-3 had more strain-specific genes than most of the 20 P. stutzeri strains. Clusters of Orthologous Groups (COGs) analysis revealed that SI-3 had a higher proportion of genes assigned to transcriptional regulation and signal transduction compared with the 20 P. stutzeri strains, including four rhizosphere bacteria, indicating a complicated interaction network between SI-3 and its host. P. stutzeri is renowned for its metabolic versatility in aromatic compounds degradation. However, significant gene loss was observed in several aromatic compounds degradation pathways in SI-3, which may be an evolutional adaptation that developed upon association with its host. KEGG analysis revealed that dissimilatory nitrate reduction to ammonium (DNRA) and denitrification, two competing dissimilatory nitrate reduction pathways, co-occurred in the genome of SI-3, like most of the other 20 P. stutzeri strains. We speculated that DNRA of SI-3 may contribute a competitive advantage in nitrogen acquisition of U. prolifera by conserving nitrogen in NH4+ form, as in the case of microalgae bloom. Collectively, these data suggest that Pseudomonas sp. strain SI-3 was a suitable candidate for investigation of the algae-bacteria interaction with U. prolifera and the ecological impacts on algal blooming
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superoleophilic ulva prolifera for oil water separation a repayment from the Green Tide
Chemical Engineering Journal, 2016Co-Authors: Jin Zhao, Yuxi Xue, Ri Qiu, Lin Fan, Weimin Guo, Peng WangAbstract:The Green Tide formed by the macro-algae Ulva prolifera has caused problems to human being society. Finding the application will afford an effective way to eliminate the negative impact of the massive biomass. Fibrous U. prolifera can be a candidate for oil separation from seawater-oil mixture, a catastrophe to environment and ecology resulted from the oil spillage and emission. In this study, for the first time, U. prolifera collected from the Green Tide of 2015 was modified with dodecyltrichlorosilane to enable hydrophobicity and superoleophilicity properties. Different techniques, such as scanning electron microscopy, energy dispersive spectroscopy and X-ray photoelectron spectroscopy, were used for characterizing the algae morphology and composition. The surface modification enables the surface wettability change from hydrophilicity to hydrophobicity, leading to high affinity to oil phase instead of water. Therefore, the Green Tide formed by algae affords a massive resource for oil collection, and superoleophilic U. prolifera for oil/water separation is a repayment from the Green Tide. (C) 2016 Elsevier B.V. All rights reserved.
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Superoleophilic Ulva prolifera for oil/water separation: A repayment from the Green Tide
Chemical Engineering Journal, 2016Co-Authors: Jin Zhao, Yuxi Xue, Ri Qiu, Guo Weimin, Lin Fan, Peng WangAbstract:The Green Tide formed by the macro-algae Ulva prolifera has caused problems to human being society. Finding the application will afford an effective way to eliminate the negative impact of the massive biomass. Fibrous U. prolifera can be a candidate for oil separation from seawater-oil mixture, a catastrophe to environment and ecology resulted from the oil spillage and emission. In this study, for the first time, U. prolifera collected from the Green Tide of 2015 was modified with dodecyltrichlorosilane to enable hydrophobicity and superoleophilicity properties. Different techniques, such as scanning electron microscopy, energy dispersive spectroscopy and X-ray photoelectron spectroscopy, were used for characterizing the algae morphology and composition. The surface modification enables the surface wettability change from hydrophilicity to hydrophobicity, leading to high affinity to oil phase instead of water. Therefore, the Green Tide formed by algae affords a massive resource for oil collection, and superoleophilic U. prolifera for oil/water separation is a repayment from the Green Tide. (C) 2016 Elsevier B.V. All rights reserved.
