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Pauciramus yunnanensis,*** ***.,a novel freshwater red alga from China with proposal of the Ottiales ***.(Nemaliophycidae,Rhodophyta)

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Journal of Oceanology and limnology 2022年第3期40卷 1245-1256页

作者： Kunpeng FANG Fangru NAN Jia FENG junping lü Qi lIU Xudong lIU Shulian XIE School of life Science Shanxi Key Laboratory for Research and Development of Regional PlantsShanxi UniversityTaiyuan 030006China

Species of the red algal order Acrochaetiales mostly inhabit marine environments,with only two freshwater taxa Audouinella and Ottia.A new genus and species are described for freshwater red alga Pauciramus yunnanensis from Ailao Mountain,Yunnan,*** is closely related to Ottia and a new order Ottiales was proposed for these *** has unique combination of morphological characteristics including the following:plants caespitose and densely pulvinate,slender uniseriate filaments with well-developed rhizoids,rarely branched,cylindrical vegetative cell with a single,ribbon-shaped and parietal chloroplast,reproduction by tetrasporangia,and dense sporangial branchlet only at the upper portion of *** analysis of sequence data from the plastid ribulose-1,5-bisphosphate carboxylase-oxygenase large-subunit(rbc l),small subunit gene of the ribosomal cistron(SSU)and barcode region near the 5′end of the mitochondrial cytochrome oxidase subunit I(COI-5P)indicated that:the new taxon,***,was in a well-supported clade with Ottia meiospora,and this clade was sister to order Palmariales and *** adhere to the principle of monophyly,a new freshwater order Ottiales including Ottia and Pauciramus is *** the high sequence interspecific divergences and obvious morphological differences between genera Ottia and Pauciramus,seems impractical to establish a new family for a monospecific ***,we temporarily classified Pauciramus into the family Ottiaceae,and made necessary revisions to the description to accommodate this genus.

关键词： China 5′end of the mitochondrial cytochrome oxidase subunit I(COI-5P) Ottiales Pauciramus ribulose-1,5-bisphosphate carboxylase-oxygenase large-subunit(rbc l) small subunit gene of the ribosomal cistron(SSU)

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Morphology and phylogenetic placement of Mallomonas vietnamica(Synurales,Chrysophyceae)from China

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Journal of Oceanology and limnology 2024年第4期42卷 1325-1335页

作者： Junxue HAO Fangru NAN junping lü Qi lIU Xudong lIU Shulian XIE Jia FENG School of life Science Shanxi UniversityTaiyuan 030006China

The newly described chrysophyte,Mallomonas vietnamica,is reported for the first time in China from specimens collected in Guizhou Province,SW *** morphological characteristics were studied using light and scanning electron *** species was described based on morphological characteristics,including cell size,scale size,dome,V-rib,and ***,molecular sequencing of *** was conducted and a phylogenetic tree was constructed based on concatenated SSU,lSU,and rbc l *** phylogenetic tree led us to suggest raising a new section named Uncatusipedae for this *** study provides new molecular data from the genus Mallomonas and enriches our understanding of the species diversity and geographical distribution of the genus Mallomonas in China.

关键词： Chrysophyta Mallomonas vietnamica phylogenetic study taxonomy

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Transcriptome profile of Dunaliella salina in Yuncheng Salt lake reveals salt-stress-related genes under diff erent salinity stresses

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Journal of Oceanology and limnology 2021年第6期39卷 2336-2362页

作者： Fan GAO Fangru NAN Jia FENG junping lü Qi lIU Xudong lIU Shulian XIE School of life Science Shanxi Key Laboratory for Research and Development of Regional PlantsShanxi UniversityTaiyuan 030006China

Salt stress is an abiotic stress to plants in especially saline ***,a halophilic microalga distributed throughout salt lakes and seas,can respond to different salinity stresses by regulating the expression of some ***,these genes and their function and biological processes involved remain *** ling these salt-stress-related genes in a high-salt-tolerant Dunaliella species will help clarify the salt tolerance machinery of *** ***_YC salt-stress groups were tested under low(0.51 mol/l),moderate(1.03 mol/l),and high(3.42 mol/l)NaCl concentrations and one control group under very low(0.05 mol/l)NaCl concentration and 3 transcriptome results that were deep sequenced and de novo assembled were obtained per *** high-quality RNA-seq libraries with 46585 upregulated and 47805 downregulated unigenes were *** to the control,188 common differentially expressed genes(DEGs)were screened and divided into four clusters in expression *** of them annotated in the significant enriched Gene Ontology(GO)and Kyoto Encyclopedia of Genes and Genomes(KEGG)were validated via *** qPCR-based relative expression patterns were similar to their RNA-seq-based *** significant DEGs,the geranylgeranyl diphosphate synthase coding gene(1876-bp cDNA)and diacylglycerol O-acyltransferase coding gene(2968-bp cDNA),were cloned and analyzed in *** total lipid content,superoxide dismutase specific activity,and betacarotene content of ***_YC increased gradually with increasing *** addition,the expression of 11 validated genes involved in fatty acid biosynthesis/degradation,active oxygen or carotenoid metabolisms showed significant *** addition,algal photochemical efficiency was diminished with increasing salinity,as well as the expression of 4 photosynthesis-related *** results could help clarify the molecular mechanisms underlying *** responses to the Yuncheng Salt lake env

关键词： Dunaliella salina transcriptome analysis de novo assembly salt stress

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Identification of novel salt stress-responsive microRNAs through sequencing and bioinformatic analysis in a unique halophilic Dunaliella salina strain

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Journal of Oceanology and limnology 2023年第4期41卷 1558-1574页

Dunaliella salina is a classic halophilic ***,its molecular mechanisms in response to high salinity at the post transcriptional level remain unknown.A unique halophilic alga strain,DS-CN1,was screened from four *** strains via cell biological,physiological,and biochemical ***-throughput sequencing of small RNAs(sRNAs)of DS-CN1 in culture medium containing 3.42-mol/l NaCl(SS group)or 0.05-mol/l NaCl(CO group)was performed on the BGISEQ-500 *** annotation and sequences of *** sRNAs were ***,44 novel salt stress-responsive microRNAs(miRNAs)with a relatively high C content,with the majority of them being 24 nt in length,were identified and characterized in ***-one differentially expressed miRNAs(DEMs)in SS and CO were screened via bioinformatic analysis.A total of 319 putative salt stress-related genes targeted(104 overlapping genes)by novel miRNAs in this alga were screened based on our previous transcriptome sequencing ***,these target genes were classified and enriched by GO and KEGG pathway ***,5 novel DEMs(dsa-mir3,dsa-mir16,dsa-mir17,and dsa-mir26 were significantly upregulated,and dsa-mir40 was significantly downregulated)and their corresponding 10 target genes involved in the 6 significantly enriched metabolic pathways were verified by quantitative real-time ***,their regulatory relationships were comprehensively ***,a unique salt stress response metabolic network was constructed based on the novel DEM-target gene *** together,our results suggest that 44 novel salt stress-responsive microRNAs were identified,and 4 of them might play important roles in *** upon salinity stress and contribute to clarify its distinctive halophilic *** study will shed light on the regulatory mechanisms of salt stress responses.

关键词： Dunaliella salina salt stress response small RNA(sRNAs)sequencing microRNA(miRNAs)

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Comparison and phylogeny on mitochondrial genome of marine and freshwater taxa of genus Hildenbrandia(Florideophyceae,Rhodophyta)

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Journal of Oceanology and limnology 2023年第6期41卷 2324-2335页

作者： Fangru NAN Juan lI Jia FENG junping lü Qi lIU Xudong lIU Shulian XIE School of life Science Shanxi UniversityTaiyuan 030006China

Hildenbrandia is an early diverged lineage in Florideophyceae,*** species diversity of this genus is still unresolved due to the simple morphology and limited molecular *** mitochondrial genome of freshwater *** was determined in this *** freshwater *** had a larger mitochondrial genome than the marine *** and GC content was *** alignment structure was observed between the mitochondrial genomes of *** and ***,except for one block that was encoded on the complement *** introns were found in mitochondrial genome of *** than in ***,and *** shares the common feature with Bangiophyceae that two introns were distributed in *** of mitochondrial genome organization suggests that *** preserves characters that could be hypothetically more similar to the ancestor of Bangiophyceae and Florideophyceae,which differ with previous studies based on chloroplast,and nuclear *** mitochondrial genomes and phylogenetic analyses combing nuclear,chloroplast and mitochondrial genomes are needed to clarify this ***-based phylogeny in this study resulted in better solution at both the deep and recent derived nodes than single-gene *** protein-coding genes between *** and *** were identical except atp8,which was present in *** while absent from *** finding follows the trend that high Ka/Ks ratio genes are more frequently lost than low Ka/Ks ratio ones in red algae.

关键词： red algae organelle genome freshwater species phylogenomics

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Phylogenetic, evolutionary, and biogeographic origin of the genus Sheathia (Batrachospermales, Rhodophyta)

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Journal of Oceanology and limnology 2022年第2期40卷 729-744页

作者： Jinfen HAN Fangru NAN Jia FENG junping lü Qi lIU Xudong lIU Shulian XIE School of life Science Shanxi Key Laboratory for Research and Development of Regional PlantsShanxi UniversityTaiyuan 030006China

The genus Sheathia consists of over 20 species primarily distributed in Asia,Europe,Oceania,North America,and ***,the origin and evolution of this genus remain *** gametophyte stage specimens(SAS18052 and SAS18523)and two“Chantransia”stage specimens(YTS19161 and YTS19017)were collected from Shanxi and Henan Provinces in China,*** on morphological data,isolates YTS19161 and YTS19017 were similar to Audouinella pygmaea,whereas the morphological characteristics of SAS18052 and SAS18523 were in good agreement with the circumscription description of *** sequences of rbc l,COI-5P,and psb A were used to investigate the phylogenetic,evolutionary,and biogeographic origin of the genus *** three molecular markers supported that the two gametophyte stage specimens belong to ***,while the isolates YTS19161 and YTS19017 were the“Chantransia”of *** area reconstruction and divergence time estimation speculated that Sheathia originated in North America,a portion of the Pangaea at approximately 328.07-184.73 million years ago(Ma).Our relaxed molecular clock analysis suggests that the Florideophyceae diverged approximately 741.04(894.36-631.70)*** major divergences in this class involved the emergence of Nemaliophycidae[ca.662.01(779.83-580.51)Ma],and the split of orders Batrachospermales and Thoreales[ca.456.10(552.80-367.88)Ma].

关键词： divergence time geographic origin molecular analysis morphology phylogenetic relationship

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Virescentia guangxiensis(Batrachospermales,Rhodophyta):a new freshwater red algal species from South China

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Journal of Oceanology and limnology 2021年第4期39卷 1538-1546页

Virescentia guangxiensis,a new species of Virescentia from Guangxi,South China,is described and illustrated based on morphological observations and phylogenetic *** species was distinguished morphologically from other species by the presence of special expansion cells with a variable shape,obovoid,spherical,pear-shaped,located in the penultimate cells of primary or secondary fascicles,rarely terminal on primary fascicles,as well as by small whorls(250-350-μm wide)and short primary fascicles(5-7 cell stories).Phylogenetic analysis of molecular data from the rbc l and COI-5P loci supported the separation of the proposed new species from other species in the genus *** is the first species of the order Batrachospermales reported in Guangxi and the second species of the genus Virescentia reported in *** study expands the known species diversity and geographical distribution of freshwater Rhodophyta in China.

关键词： Virescentia new species rbc l COI-5P China

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Transcriptome analysis of Porphyridium purpureum under salinities of 0 and 68

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Journal of Oceanology and limnology 2022年第4期40卷 1600-1614页

作者： Xudan lU Fangru NAN Jia FENG junping lü Qi lIU Xudong lIU Shulian XIE School of life Science Shanxi Key Laboratory for Research and Development of Regional PlantsShanxi UniversityTaiyuan 030006China

The most prominent biological characteristic of Porphyridium purpureum is their unique extracellular sulfated polysaccharides that plays an important protective role against salt *** to stress is associated with metabolic ***,the molecular mechanisms underlying such metabolic changes remain *** study presents the fi rst transcriptome profi ling of ***.A total of 8019 assembled transcripts were identifi ed,annotated,and classifi ed into diff erent biological categories and pathways based on a BlAST analysis against various *** in-depth analysis revealed that many of the diff erentially expressed genes in *** under salinities of 68 and 0 involved polysaccharide metabolism.A comparison of the gene expression levels under diff erent salinities revealed that the polysaccharide synthetic pathway was signifi cantly upregulated under the 68 salinity *** increased expression of the FBP,pfkA,CS,pgm,USP,UGP2,galE,and MPI transcripts in the polysaccharide synthetic pathway and the increase in ATP2 and ATP6 transcripts in the energy metabolic pathway revealed the molecular mechanism of high-salt *** sequencing dataset and analysis could serve as a valuable resource to study the mechanisms involved in abiotic stress tolerance in Rhodophyta.

关键词： transcriptome salinity polysaccharides osmotic adjustment enzyme activity

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Effects of phytoplankton community and interaction between environmental variables on nitrogen uptake and transformations in an urban river

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Journal of Oceanology and limnology 2022年第3期40卷 1012-1026页

作者： Jing YANG Haiguang PEI junping lü Qi lIU Fangru NAN Xudong lIU Shulian XIE Jia FENG School of life Science Shanxi UniversityTaiyuan 030006China

Phytoplankton are not only the main bearer of the nitrogen cycle,but also a key link driving nitrogen ***,most phytoplankton cannot directly use N_(2),and they must uptake nitrogenous nutrients(ammonium,nitrate,and urea)to meet their photosynthesis *** examined the uptake characteristics of several nitrogenous substrates using stable isotope technique and identifi ed the potential nitrogen transformations in the Fenhe *** revealed that spring phytoplankton community composed of mainly Fragilaria,Ulothrix,Microcystis,and *** can meet the spring partial nitrogen requirement of *** large uptake rate of urea depended on urease,chlorophyll a,and nitrate concentrations as shown in random forest *** explained more than 42.8%of the total abundance at all sites in *** was dominated by Actinastrum,and Chlorella was relevant in the downstream *** uptake rates of ammonium were higher than those of nitrate and *** addition,the random forest model demonstrated that ammonium,urease,and dissolved oxygen(DO)were the major contributors to the ammonium uptake *** was taken up preferentially in autumn and phytoplankton(Cyclotella,Chlorella,and Pseudanabaena)appeared to be able to respond to changes in nitrogen forms by adjusting their community *** equation models demonstrated that temperature-induced changes in DO directly affected the transformations of different forms of *** the same time,dissolved organic carbon can directly act on nutrients and then indirectly affect enzyme *** were great diff erences in the positive and negative effects of different paths in the process of nitrate reduction to nitrite and then reduction to ammonium in time and *** findings provide a better understanding of the underlying mechanism of nitrogen uptake and the influences of interaction between environmental variables on nitrogen transformations in urban ri

关键词： phytoplankton environmental variables nitrogen uptake transformation urban river

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Makinoella parva,a new species of the genus Makinoella(Oocystaceae,Trebouxiophyceae,Chlorophyta)

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Journal of Oceanology and limnology 2023年第6期41卷 2391-2402页

作者： Xudong lIU Chen SU Jia FENG junping lü Qi lIU Fangru NAN Guoxiang lIU Shulian XIE School of life Science Shanxi Key Laboratory for Research and Development of Regional PlantsShanxi UniversityTaiyuan 030006China Key laboratory of Algal Biology Institute of HydrobiologyChinese Academy of SciencesWuhan 430072China

Makinoella Okada is a genus of coccoid green algae belonging to the family Oocystaceae with typical morphological *** to date included only one type *** the genus is rarely reported,there is a lack of taxonomic *** this study,17 strains of this genus were collected from several different places in China,and their taxonomic studies were conducted based on morphological and molecular phylogenetic *** phylogenetic results based on the analysis of ITS,chloroplast genes rbc l and tuf A showed that the genus was divided into two *** of the branches comprised newly collected *** base changes(CBCs)and hemi-compensatory base changes(hemi-CBCs)within the secondary structure of the ITS-2 confirmed the branches as two *** with the type species of Makinoella tosaensis,the cell size of this new branch was only about 50%,and included 2-4 colonial ***,based on the smaller cell size,simpler colony composition,independent phylogenetic position and CBCs and hemi-CBCs,we suggest that the new clade should be designated as a new taxon of Makinoella,namely Makinoella *** the four molecular markers using in this study,the rbc l and newly introduced ITS are recommended for species separation,which can help further studies to revise the species and generic concepts of the family.

关键词： coccoid green algae Makinoella morphology observation Oocystaceae phylogenetic analysis

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