Journal of Eukaryotic Microbiology最新文献

The Dinoflagellate Gonyaulax fragilis Is ‘the Wrong Man’ of the Dirty Seas, and Reinstatement of Steiniella Within the Protoceratiaceae (Dinophyceae) 脆弱的甲藻Gonyaulax fragilis是肮脏海洋的“错误的人”，以及原角虫科（甲藻科）Steiniella的恢复

IF 2.1 4区生物学

Journal of Eukaryotic Microbiology Pub Date : 2025-06-11 DOI: 10.1111/jeu.70020

Fernando Gómez, Huan Zhang, Luis Felipe Artigas, Senjie Lin

{"title":"The Dinoflagellate Gonyaulax fragilis Is ‘the Wrong Man’ of the Dirty Seas, and Reinstatement of Steiniella Within the Protoceratiaceae (Dinophyceae)","authors":"Fernando Gómez, Huan Zhang, Luis Felipe Artigas, Senjie Lin","doi":"10.1111/jeu.70020","DOIUrl":"https://doi.org/10.1111/jeu.70020","url":null,"abstract":"<div>\u0000 \u0000 The production of mucilage aggregates is commonly associated with diatoms, but the harmful events known as ‘mare sporco’ or dirty seas have been attributed to the dinoflagellate Gonyaulax fragilis or G. hyalina. The synonymy of these taxa has been debated for decades. We report observations of G. fragilis from the Mediterranean Sea, and Atlantic and Indian Oceans, along with its SSU- and LSU rRNA gene and ITS region sequences from cells of the open Indian Ocean. The rDNA/ITS sequences are distantly related to those identified as G. fragilis from the Mediterranean Sea and New Zealand involved in dirty sea events. Unequivocally, G. fragilis is not the culprit of the mucilage events. Gonyaulax fragilis clusters with full support alongside with Schuettiella mitra, forming a sister group to the benthic genus Carinadinium, as an earlier branching lineage with the Protoceratiaceae (Ceratocorys, Pentaplacodinium, Protoceratium). A single anterior intercalary plate (1a) characterizes these genera, while the Gonyaulacaceae possess 2a. The genus Steiniella, first described for G. fragilis and S. mitra, has historically been synonymized with Gonyaulax. We reinstate Steiniella for these two species, and S. inflata, placing Schuettiella as a junior synonym. The species responsible of the mucilage events is attributed to G. hyalina.\u0000 </div>","PeriodicalId":15672,"journal":{"name":"Journal of Eukaryotic Microbiology","volume":"72 4","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144264346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

On the Identity and Taxonomic Circumscription of the Pfiesteriacean Genera Aduncodinium and Speroidium (Dinophyceae) 拟拟藻科Aduncodinium属和Speroidium属的鉴定与分类界限

IF 2.1 4区生物学

Journal of Eukaryotic Microbiology Pub Date : 2025-06-07 DOI: 10.1111/jeu.70015

Albert Reñé, Aika Yamaguchi, Takeo Horiguchi, António José Calado, Mona Hoppenrath

{"title":"On the Identity and Taxonomic Circumscription of the Pfiesteriacean Genera Aduncodinium and Speroidium (Dinophyceae)","authors":"Albert Reñé, Aika Yamaguchi, Takeo Horiguchi, António José Calado, Mona Hoppenrath","doi":"10.1111/jeu.70015","DOIUrl":"https://doi.org/10.1111/jeu.70015","url":null,"abstract":"With its former circumscription, the genus Katodinium included purportedly naked species with a much larger epi- than hypocone, several of which were shown to be distantly related to the type species K. nieuportense. Most of these species have recently been transferred to other genera, several of them newly established. Among these new genera, Aduncodinium was proposed to encompass Katodinium glandula (=Gymnodinium glandula), and Speroidium was erected to encompass Katodinium fungiforme (=Gymnodinium fungiforme). However, the genus Aduncodinium was invalidly published and several morphological aspects described need to be re-evaluated. On the other hand, the inclusion in K. fungiforme of morphological and molecular characters observed in the strain known as VDH034S “Bullet,” a pfiesteriacean, needs re-evaluation because the latter shows a higher resemblance to Aduncodinium species than to K. fungiforme. The present contribution aimed to clarify the identity of the taxa involved on the basis of newly collected morphological and molecular information, and thereby avoid the nomenclatural and taxonomical uncertainties raised by previously published concepts of the genera Aduncodinium and Speroidium.","PeriodicalId":15672,"journal":{"name":"Journal of Eukaryotic Microbiology","volume":"72 4","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jeu.70015","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144232360","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High Protistan Parasite Occurrence During Fall in a Warm, Low Sea Ice Year in the Eastern Bering Sea 白令海东部温暖低海冰年秋季高原生体寄生虫的发生

IF 2.1 4区生物学

Journal of Eukaryotic Microbiology Pub Date : 2025-06-05 DOI: 10.1111/jeu.70018

Tanika M. Ladd, Sylvia M. Kim, Eunji Park, Brian S. Leander, María Débora Iglesias-Rodríguez

{"title":"High Protistan Parasite Occurrence During Fall in a Warm, Low Sea Ice Year in the Eastern Bering Sea","authors":"Tanika M. Ladd, Sylvia M. Kim, Eunji Park, Brian S. Leander, María Débora Iglesias-Rodríguez","doi":"10.1111/jeu.70018","DOIUrl":"https://doi.org/10.1111/jeu.70018","url":null,"abstract":"Marine protists in the eastern Bering Sea (EBS) are understudied despite being a critical component of the productive subarctic ecosystem. Climate change, and particularly the loss of sea ice, is rapidly altering this ecologically vulnerable and economically important system. In this study, the EBS protist community was characterized across recent years with drastic differences in sea ice extent. In 2019, when the extent of sea ice was anomalously low and retreat occurred early, increased fall water temperatures and surface salinities were observed, and the protist community was dominated by apicomplexan parasites. In contrast, 2017 had more typical winter sea ice conditions and in the fall, water temperatures and surface salinities were lower and protist communities were more diverse, with a larger ratio of primary producer to consumer protists compared to 2019. Surface water temperature was identified as a key predictor of apicomplexan compositional abundance and may be important in the life histories of parasites and their hosts. The interannual variability observed here indicates that the transfer of energy and biomass through the EBS ecosystem can differ drastically across years with differential sea ice influence and highlights the need to monitor protist communities and explore the impacts of protistan parasites.","PeriodicalId":15672,"journal":{"name":"Journal of Eukaryotic Microbiology","volume":"72 4","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jeu.70018","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144220074","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High Grazing Rates of Marine Askenasia cf. stellaris on Mesodinium rubrum and Insights Into Its Taxonomic Status 海星对红中草的高采食率及其分类地位的认识

IF 2.1 4区生物学

Journal of Eukaryotic Microbiology Pub Date : 2025-05-30 DOI: 10.1111/jeu.70014

Matthew D. Johnson, Kasia Hammar, David Beaudoin, Houshuo Jiang, Peter Vďačný

{"title":"High Grazing Rates of Marine Askenasia cf. stellaris on Mesodinium rubrum and Insights Into Its Taxonomic Status","authors":"Matthew D. Johnson, Kasia Hammar, David Beaudoin, Houshuo Jiang, Peter Vďačný","doi":"10.1111/jeu.70014","DOIUrl":"https://doi.org/10.1111/jeu.70014","url":null,"abstract":"<div>\u0000 \u0000 Askenasia is a conspicuous ciliate in plankton assemblages of fresh and marine ecosystems; however, many aspects of its biology, taxonomy, and ecology remain enigmatic. Here we provide new information on the behavior, prey preferences, ultrastructure, and phylogenetic diversity of marine Askenasia, from perhaps the first ever cultures established for this genus. Askenasia spp. have long been suspected of being predatory, i.e., feeding on other ciliates, and here we reveal that several isolates of marine A. cf. stellaris had high ingestion and growth rates on the ciliate Mesodinium rubrum. This result supports numerous observations of Askenasia co-occurring with M. rubrum in a variety of ecosystems. While we found no evidence of grazing on several other species of ciliates or photosynthetic flagellates, A. cf. stellaris probably does ingest other small ciliates as prey. Using transmission electron microscopy imaging of Askenasia, we show that the dikinetids of its equatorial ciliary belt resemble those found in Prostomatea ciliates, supporting phylogenetic analysis of partial 18S rRNA genes from two A. cf. stellaris strains. We also provide ultrastructural details of the contractile and food vacuoles in Askenasia. Our results suggest that A. cf. stellaris can be an important predator of M. rubrum in coastal marine ecosystems.\u0000 </div>","PeriodicalId":15672,"journal":{"name":"Journal of Eukaryotic Microbiology","volume":"72 4","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144179300","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Prorocentrum insidiosum sp. nov. (Prorocentrales, Dinophyceae): Morphological and Phylogenetic Characterization of a Mucosphere Producing Dinoflagellate From the “cordatum Group” proorocentrum insidiosum sp. 11 . (proorocentrales, Dinophyceae)：来自“cordatum Group”的一种产生黏液圈的鞭毛藻的形态和系统发育特征

IF 2.1 4区生物学

Journal of Eukaryotic Microbiology Pub Date : 2025-05-30 DOI: 10.1111/jeu.70017

Michaela E. Larsson, Gustaaf Hallegraeff, Martina A. Doblin, Urban Tillmann

{"title":"Prorocentrum insidiosum sp. nov. (Prorocentrales, Dinophyceae): Morphological and Phylogenetic Characterization of a Mucosphere Producing Dinoflagellate From the “cordatum Group”","authors":"Michaela E. Larsson, Gustaaf Hallegraeff, Martina A. Doblin, Urban Tillmann","doi":"10.1111/jeu.70017","DOIUrl":"https://doi.org/10.1111/jeu.70017","url":null,"abstract":"Prorocentrum cf. balticum was the provisional designation assigned to strains of a small, pelagic, mixoplanktonic dinoflagellate found to produce carbon-rich mucilage-based prey capture devices, termed “mucospheres.” Here we characterize the morphology and phylogeny of the strains, describe them as Prorocentrum insidiosum sp. nov., and discuss common morphological features among the six species of the phylogenetically defined P. cordatum group. Cells of P. insidiosum sp. nov. were round to slightly ovate in lateral view, 12–16 μm long and 8–15 μm deep, and laterally compressed. Scanning electron microscopy revealed the thecal plates were densely ornamented with short spines and there were two size classes of pores irregularly distributed across both plates, and a row of two to four large round pores in apical-ventral position on the right thecal plate. The periflagellar area consisted of eight platelets, and there were two prominent wing-like apical projections in the form of a double layered curved structure on platelet 1 with additional projections on most other platelets except platelet 4. Prorocentrum insidiosum sp. nov. is distinct from all genetically represented species within the genus and possesses a unique combination of morphological features differentiating it from other protologues of small Prorocentrum species.","PeriodicalId":15672,"journal":{"name":"Journal of Eukaryotic Microbiology","volume":"72 4","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jeu.70017","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144179301","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Stochastic Processes Drive the Assembly of Planktonic Ciliates in A Trellised River Network 随机过程驱动格子状河网浮游纤毛虫的聚集

IF 2.1 4区生物学

Journal of Eukaryotic Microbiology Pub Date : 2025-05-21 DOI: 10.1111/jeu.70016

Chang Chu, Lianwen Zhao, Lele Chen, Lijing Chen, Liqing Wang, Chenhong Li, Jiamei Jiang, Hongbo Pan

{"title":"Stochastic Processes Drive the Assembly of Planktonic Ciliates in A Trellised River Network","authors":"Chang Chu, Lianwen Zhao, Lele Chen, Lijing Chen, Liqing Wang, Chenhong Li, Jiamei Jiang, Hongbo Pan","doi":"10.1111/jeu.70016","DOIUrl":"https://doi.org/10.1111/jeu.70016","url":null,"abstract":"<div>\u0000 \u0000 The topology and connectivity of rivers can be modified by the water project operation for agriculture and civilization, as exemplified by the trellised river system in Chongming Island. Ciliates, as an exceptional indicator, are often employed for monitoring the health of aquatic ecosystems. However, the assembly and structure of planktonic microeukaryote (e.g., ciliates) communities, especially in complex river networks, are rarely investigated. Here, we investigated the ciliate community structure and assembly mechanism among seasons in Chongming Island's trellised river network using both metabarcoding and quantitative protargol stain (QPS) approaches. Both methods showed that ciliates exhibited similar community composition at the class level and distinct seasonal succession, which are attributed to variations in nutrients, dissolved oxygen and water temperature. The stochastic process was the main factor in explaining the assembly of the ciliate community in all seasons, which is probably attributed to the high connectivity of the river network and the frequent opening of sluices for the water project operation. Collectively, unique ciliate community structure, seasonal variation, and specific community assembly mechanism driven by hydrology were reported in this study. Furthermore, methodological differences also should be fully considered when conducting an ecological study in complex hydrographic waters.\u0000 </div>","PeriodicalId":15672,"journal":{"name":"Journal of Eukaryotic Microbiology","volume":"72 3","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144108840","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Sea Cucumber-Infecting Parasite Apostichocystis gudetama gen. nov. sp. nov. Expands Marine-Host-Specific Clade of Apicomplexans 海参感染寄生虫gudetama aposticystis gen. nov. sp. nov.扩展了顶复合体的海洋宿主特异性分支

IF 2.1 4区生物学

Journal of Eukaryotic Microbiology Pub Date : 2025-05-19 DOI: 10.1111/jeu.70013

Anthony M. Bonacolta, Joana Krause-Massaguer, Tatsuya Unuma, Javier del Campo

{"title":"The Sea Cucumber-Infecting Parasite Apostichocystis gudetama gen. nov. sp. nov. Expands Marine-Host-Specific Clade of Apicomplexans","authors":"Anthony M. Bonacolta, Joana Krause-Massaguer, Tatsuya Unuma, Javier del Campo","doi":"10.1111/jeu.70013","DOIUrl":"https://doi.org/10.1111/jeu.70013","url":null,"abstract":"Unknown ellipsoid bodies, later classified as apicomplexan cysts, are prevalent in the ovaries of Japanese sea cucumbers (Apostichopus japonicus), where they can lead to lower fecundity in infected individuals and adverse effects on wild populations as well as aquaculture efforts for this endangered species. Apicomplexans are widespread and essential to marine environments, where they can affect the health and fitness of host populations. We performed genomic sequencing of recovered cysts to gain more ecological and evolutionary information on this parasite. We recovered this apicomplexan's complete nuclear ribosomal RNA (rrn) operon, the entire mitochondrial genome, and a partial apicoplast (relic chloroplast) genome. The rrn operon phylogeny revealed this parasite as being closely related to coccidian-like parasites of marine fish (ichthyocolids) and cnidarians (corallicolids), while organelle phylogenomics hint at a closer relation to the protococcidian Eleutheroschizon. Using this new phylogenetic context and previous morphological descriptions, we describe this parasite as Apostichocystis gudetama gen. nov. sp. nov. Mining available microbiomes reveal the presence of Apostichocystis spp. beyond its host range, alluding to other potential hosts or cryptic, closely related lineages. Its phylogenetic placement has important implications concerning the evolution of parasitism within Apicomplexa and the divergence of a marine-host-specific clade of coccidian-like parasites.","PeriodicalId":15672,"journal":{"name":"Journal of Eukaryotic Microbiology","volume":"72 3","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jeu.70013","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144085044","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Complete Mitochondrial Genomes of Ancyromonads Provide Clues for the Gene Content and Genome Structures of Ancestral Mitochondria 弓形虫线粒体全基因组为祖先线粒体基因含量和基因组结构提供线索

IF 2.1 4区生物学

Journal of Eukaryotic Microbiology Pub Date : 2025-05-18 DOI: 10.1111/jeu.70012

Ryo Harada, Takashi Shiratori, Akinori Yabuki, Yuji Inagaki, Andrew J. Roger, Ryoma Kamikawa

{"title":"Complete Mitochondrial Genomes of Ancyromonads Provide Clues for the Gene Content and Genome Structures of Ancestral Mitochondria","authors":"Ryo Harada, Takashi Shiratori, Akinori Yabuki, Yuji Inagaki, Andrew J. Roger, Ryoma Kamikawa","doi":"10.1111/jeu.70012","DOIUrl":"https://doi.org/10.1111/jeu.70012","url":null,"abstract":"Mitochondria of eukaryotic cells are direct descendants of an endosymbiotic bacterium related to Alphaproteobacteria. These organelles retain their own genomes, which are highly reduced and divergent when compared to those of their bacterial relatives. To better understand the trajectory of mitochondrial genome evolution from the last eukaryotic common ancestor (LECA) to extant species, mitochondrial genome sequences from phylogenetically diverse lineages of eukaryotes—particularly protists—are essential. For this reason, we focused on the mitochondrial genomes of Ancyromonadida, an independent and understudied protist lineage in the eukaryote tree of life. Here we report the mitochondrial genomes from three Ancyromonadida: Ancyromonas sigmoides, Nutomonas longa, and Fabomonas tropica. Our analyses reveal that these mitochondrial genomes are circularly mapping molecules with inverted repeats that carry genes. This inverted repeat structure has been observed in other mitochondrial genomes but is patchily distributed over the tree of eukaryotes. Ancyromonad mitochondrial genomes possess several protein-coding genes, which have not been detected from any other mitochondrial genomes of eukaryotes sequenced to date, thereby extending the known mitochondrial gene repertoire of ancestral eukaryotes, including LECA. These findings significantly expand our understanding of mitochondrial genome diversity across eukaryotes, shedding light on the early phases of mitochondrial genome evolution.","PeriodicalId":15672,"journal":{"name":"Journal of Eukaryotic Microbiology","volume":"72 3","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jeu.70012","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144085235","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A New Paramoeba Isolate From Florida Exhibits a Microtubule-Bound Endosymbiont Closely Associated With the Host Nucleus 从佛罗里达分离的一种新的Paramoeba显示出与宿主细胞核密切相关的微管结合内共生体

IF 2.1 4区生物学

Journal of Eukaryotic Microbiology Pub Date : 2025-05-15 DOI: 10.1111/jeu.70011

Yonas I. Tekle, Atira R. Smith, Michael McGinnis, Saron Ghebezadik, Priyal Patel

{"title":"A New Paramoeba Isolate From Florida Exhibits a Microtubule-Bound Endosymbiont Closely Associated With the Host Nucleus","authors":"Yonas I. Tekle, Atira R. Smith, Michael McGinnis, Saron Ghebezadik, Priyal Patel","doi":"10.1111/jeu.70011","DOIUrl":"https://doi.org/10.1111/jeu.70011","url":null,"abstract":"The genera Paramoeba and Neoparamoeba, within the family Paramoebidae (order Dactylopodida), are distinguished by their dactylopodial pseudopodia and the presence of an intracellular eukaryotic symbiont, the Perkinsela-like organism (PLO). Taxonomic classification within these genera has been challenging due to overlapping morphological traits and close phylogenetic relationships. They are marine, with some playing significant roles as parasites. Notably, they have been implicated in sea urchin mass mortality events and are known causative agents of Amoebic Gill Disease (AGD) in fish. Despite their ecological and economic importance, many aspects of their diversity, biology, evolution, and host interactions remain poorly understood. In this study, we describe a novel amoeba species, Paramoeba daytoni n. sp., isolated from Daytona Beach, Florida. Morphological and molecular analyses confirm its placement within the Paramoeba clade, closely related to P. eilhardi, P. karteshi, and P. aparasomata. Phylogenetic assessments using 18S rDNA (18S) and Cytochrome c Oxidase I (COI) markers demonstrate the limitations of the 18S gene for species delineation, highlighting COI as a more reliable genetic marker for this group. Additionally, observations on PLO morphology, movement, and microtubule association provide insights into the endosymbiotic relationship, reinforcing the need for further research into this unique eukaryote-eukaryote symbiosis.","PeriodicalId":15672,"journal":{"name":"Journal of Eukaryotic Microbiology","volume":"72 3","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jeu.70011","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143950249","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Algal Symbiont Diversity and Host Fitness Variation in Amoebozoan Photosymbiosis 变形虫光共生中藻类共生多样性和寄主适应性变化

IF 2.1 4区生物学

Journal of Eukaryotic Microbiology Pub Date : 2025-04-25 DOI: 10.1111/jeu.70008

Daisuke Yamagishi, Ryo Onuma, Sachihiro Matsunaga, Shin-ya Miyagishima, Shinichiro Maruyama

{"title":"Algal Symbiont Diversity and Host Fitness Variation in Amoebozoan Photosymbiosis","authors":"Daisuke Yamagishi, Ryo Onuma, Sachihiro Matsunaga, Shin-ya Miyagishima, Shinichiro Maruyama","doi":"10.1111/jeu.70008","DOIUrl":"https://doi.org/10.1111/jeu.70008","url":null,"abstract":"Photosymbioses, the symbiotic relationships between microalgae and non-photosynthetic eukaryotes, are sporadically found in many eukaryotic lineages. Only a few taxa, such as cnidarians and ciliates hosting algal endosymbionts, have been actively studied, which has hindered understanding the universal mechanisms of photosymbiosis establishment. In Amoebozoa, few species are reported as photosymbiotic, and how the photosymbioses are established is still unclear. To investigate the extent to which one of the photosymbiotic amoebae, Mayorella viridis, depends on their symbionts, the amoebae were treated with reagents known to induce the collapsing of photosymbioses in other species. We succeeded in removing algal symbionts from the hosts with 2-amino-3-chloro-1,4-naphthoquinone. While the apo-symbiotic amoebae grew to the same extent as the symbiotic state when they fed on prey, their survival rates were lower than those of the symbiotic ones during starvation, suggesting that the impact of the photosymbiosis on fitness is condition-dependent. Furthermore, we showed that the photosymbiotic state was reversible by feeding two strains of the green alga Chlorella to the apo-symbiotic amoebae. The efficiencies of ingesting algal cells significantly differed between algal strains. These results suggest that the photosymbiotic relationship in the amoeba is facultative and that different algal strains have discrete symbiotic abilities to the amoeba.","PeriodicalId":15672,"journal":{"name":"Journal of Eukaryotic Microbiology","volume":"72 3","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jeu.70008","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143871804","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0