Phycological Research最新文献

{"title":"Lithophyllum nagaokaense sp. nov. (Corallinales, Corallinophycidae, Rhodophyta): A new rhodolith-forming non-geniculate coralline alga from Japan","authors":"Min-Khant-Kyaw, Aki Kato, Akira Kurashima, Lawrence M. Liao, Masasuke Baba","doi":"10.1111/pre.12549","DOIUrl":"https://doi.org/10.1111/pre.12549","url":null,"abstract":"<i>Lithophyllum</i> is a cosmopolitan coralline algal genus with 12 species currently recognized in Japan based on modern morpho-anatomical taxonomic concepts primarily characterized by having uniporate tetrasporangial and bisporangial conceptacles, the presence of secondary pit-connections between cells of adjacent filaments and a dimerous thallus construction with a single basal layer of predominantly non-palisade cells. In the present study, we describe <i>Lithophyllum nagaokaense</i> sp. nov. based on a combination of molecular and morpho-anatomical data of specimens from the temperate waters of Japan. The new species forms both attached epilithic thalli and free-living rhodoliths. Phylogenetic analyses of <i>psb</i>A, <i>rbc</i>L and COI markers resolved <i>L. nagaokaense</i> as an independent species. Morpho-anatomically, <i>L. nagaokaense</i> resembles <i>Lithophyllum johansenii</i>, originally described from Australia, but distinguished from the latter by the absence of enlarged angular cells occluding pore canals of tetrasporangial conceptacle chambers. <i>Lithophyllum nagaokaense</i> shared a fruticose morphology with <i>Lithophyllum kaiseri</i>, <i>Lithophyllum kuroshioense, Lithophyllum neo-okamurae, Lithophyllum okamurae,</i> and <i>Lithophyllum pygmaeum</i> from Japan. Of these, <i>L. nagaokaense</i> is the most similar to <i>L. neo-okamurae</i> in having attached and free-living thalli with encrusting and warty to lumpy growth forms bearing knobby protuberances that are dichotomously branched or anastomosing. The new species is distinct from other Japanese fruticose species collectively by five tetrasporangial conceptacle chamber characters and the absence of trichocytes. A taxonomic key for identifying Japanese fruticose species is provided. This is the fifth <i>Lithophyllum</i> species and the third rhodolith-forming species verified by DNA sequencing to be found in Japan.","PeriodicalId":20544,"journal":{"name":"Phycological Research","volume":"67 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140589915","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}

{"title":"Novelties in nomenclature and typification appearing in Phycological Research 72 (2).","authors":"","doi":"10.1111/pre.12547","DOIUrl":"https://doi.org/10.1111/pre.12547","url":null,"abstract":"<p><b><i>Dudresnaya ryukyuensis</i></b> M. Hoshino, Wakeman, Kitayama &amp; Kogame <b>sp. nov.</b> <i>Phycol. Res</i>. 72 (online): 135. 25 February 2024.</p>\u0000<p><b><i>Himehibirhodia</i></b> M. Hoshino, Kitayama &amp; Kogame <b>gen. nov.</b> <i>Phycol. Res</i>. 72 (online): 145. 25 February 2024.</p>\u0000<p><b><i>Himehibirhodia minima</i></b> (Okamura) M. Hoshino, Kitayama &amp; Kogame <b>comb. nov.</b> <i>Phycol. Res</i>. 72 (online): 145. 25 February 2024.</p>\u0000<p><b><i>Klisinema koreana</i></b> S.W. Kim, N. Lee, Ji-Ho Song &amp; O. Lee <b>sp. nov.</b> <i>Phycol. Res</i>. 72 (online): 70. 17 December 2023.</p>\u0000<p><b><i>Nudresdaya</i></b> M. Hoshino, A.R. Sherwood &amp; Kogame <b>gen. nov.</b> <i>Phycol. Res</i>. 72 (online): 146. 25 February 2024.</p>\u0000<p><b><i>Nudresdaya littleri</i></b> (I.A. Abbott) M. Hoshino, A.R. Sherwood &amp; Kogame <b>comb. nov.</b> <i>Phycol. Res</i>. 72 (online): 146. 25 February 2024.</p>\u0000<p>No new typifications appearing in <i>Phycological Research</i> 72 (2) (“Typification” does not include type citations associated with new taxa).</p>\u0000<p>For details of the author citations and the publication dates, see Editorial Board (2022) <i>Phycol. Res</i>. <b>70:</b> 66.</p>\u0000<p>Editorial Board of <i>Phycological Research</i>.</p>","PeriodicalId":20544,"journal":{"name":"Phycological Research","volume":"51 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140602894","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}

{"title":"Sterols of the aberrant plastid, Kareniacean dinoflagellate Asterodinium gracile: Chemotaxonomic overlap with amphisterol‐producing Amphidinium carterae","authors":"Jeffrey D. Leblond, Kyra Sabir, Daniel Ayoub, Mackenzie B. McKinnon, Chelsea S. Myers, Tawakalit J. Busari, Braedyn E. Hollingsworth","doi":"10.1111/pre.12546","DOIUrl":"https://doi.org/10.1111/pre.12546","url":null,"abstract":"SUMMARYDinoflagellates have a rich history of characterization of their membrane‐reinforcing sterols because of a structural diversity and chemotaxonomic utility uncommon to other classes of algae. The Kareniaceae are no exception in that they produce sterols, often containing a Δ<jats:sup>8(14)</jats:sup> nuclear unsaturation, which are rare in most other dinoflagellate groups. A continuing goal of our laboratory is to examine the sterols of previously uncharacterized dinoflagellates to assess their sterol‐based chemotaxonomy compared to other members of the Dinophyceae. <jats:italic>Asterodinium gracile</jats:italic>, a member of the Kareniaceae, has not been commercially available for study until recently. To this end, our objective was to characterize the sterols of <jats:italic>A. gracile</jats:italic> to determine whether they match the 4α‐methyl‐substituted, Δ<jats:sup>8(14)</jats:sup>‐nuclear‐unsaturated sterols, such as (24<jats:italic>R</jats:italic>)‐4α‐methyl‐5α‐ergosta‐8(14),22‐dien‐3β‐ol (gymnodinosterol; C<jats:sub>29:2</jats:sub>) and 27‐<jats:italic>nor</jats:italic>‐(24<jats:italic>R</jats:italic>)‐4α‐methyl‐5α‐ergosta‐8(14),22‐dien‐3β‐ol (brevesterol; C<jats:sub>28:2</jats:sub>), of most species within the canonical genera <jats:italic>Karenia</jats:italic>, <jats:italic>Karlodinium</jats:italic> and <jats:italic>Takayama,</jats:italic> or instead the 4‐desmethyl sterols, such as 27‐<jats:italic>nor</jats:italic>‐(24<jats:italic>R</jats:italic>)‐23‐methyl‐ergosta‐8(14),22‐dien‐3β‐ol (C<jats:sub>28:2</jats:sub>), of its chemotaxonomically atypical, yet closest phylogenetic relative, <jats:italic>Karenia papilionacea</jats:italic>. We have observed <jats:italic>A. gracile</jats:italic> to produce two 4α‐methyl‐substituted sterols with the suggested structures of 4α‐methyl‐5α‐ergosta‐8(14)‐en‐3β‐ol (C<jats:sub>29:1</jats:sub>) and 4α‐methyl‐5α‐ergosta‐8(14),24(28)‐dien‐3β‐ol (amphisterol, C<jats:sub>29:2</jats:sub>), as major sterols amongst five other minor sterols, which included the common dinoflagellate sterol cholest‐5‐en‐3β‐ol (cholesterol, C<jats:sub>27:1</jats:sub>), but did not include gymnodinosterol or brevesterol (as in most canonical Kareniaceae) or 27‐<jats:italic>nor</jats:italic>‐(24<jats:italic>R</jats:italic>)‐23‐methyl‐ergosta‐8(14),22‐dien‐3β‐ol (as found in <jats:italic>K. papilionacea</jats:italic>). Detection of amphisterol and 4α‐methyl‐5α‐ergosta‐8(14)‐en‐3β‐ol is notable because they are sterols associated with some species of <jats:italic>Amphidinium</jats:italic>, such as <jats:italic>Amphidinium carterae</jats:italic>, and, to our knowledge, have not been observed in a member of the Kareniaceae before. Discovery of these major sterols in <jats:italic>A. gracile</jats:italic> expands our knowledge of the range of sterols produced by the Kareniaceae and indicates a shared chemotaxonomy with some species of <jats:italic>Amphidinium</jats:italic>.","PeriodicalId":20544,"journal":{"name":"Phycological Research","volume":"58 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140155680","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}

{"title":"Taxonomic study of the polyphyletic Dudresnaya (Dumontiaceae, Florideophyceae) with descriptions of Dudresnaya ryukyuensis sp. nov. and two new genera, Himehibirhodia and Nudresdaya","authors":"Masakazu Hoshino, Kevin C. Wakeman, Aki Kato, Taiju Kitayama, Alison R. Sherwood, Shinya Uwai, Kazuhiro Kogame","doi":"10.1111/pre.12545","DOIUrl":"https://doi.org/10.1111/pre.12545","url":null,"abstract":"The red algal genus <i>Dudresnaya</i> (Dumontiaceae, Gigartinales) has traditionally been a morphologically well-defined taxon, but its molecular phylogeny has rarely been studied. To examine the phylogenetic relationships among <i>Dudresnaya</i> species, we generated new partial sequences of mitochondrial <i>cox</i>1, chloroplast <i>rbc</i>L and nuclear 28S rRNA genes from an undescribed <i>Dudresnaya</i> species from Okinawa Island, Japan, alongside five additional described species. Our phylogenetic analyses show that <i>Dudresnaya</i> is genetically diverse and polyphyletic. Based on molecular phylogeny and morphological data, we describe the Okinawan <i>Dudresnaya</i> as a new species, <i>Dudresnaya ryukyuensis</i>, and transferred <i>Dudresnaya minima</i> and <i>Dudresnaya littleri</i>, which were phylogenetically and morphologically distinct from the genuine <i>Dudresnaya</i>, to the new genera <i>Himehibirhodia</i> and <i>Nudresdaya</i>, respectively. Our phylogenetic analyses also showed that the Dumontiaceae is not a monophyletic group including the Gainiaceae and Rhizophyllidaceae (DGR complex). Considering that the DGR complex exhibits female reproductive structures and their post-fertilization development that are similar to each other, the DGR complex appears to be recognized as the Dumontiaceae <i>sensu lato</i>.","PeriodicalId":20544,"journal":{"name":"Phycological Research","volume":"15 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140006191","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}

{"title":"Field survey of the phase and sex ratios of the brown alga Dictyota dichotoma (Dictyotales, Phaeophyceae) using sex-specific molecular markers","authors":"Takahiro Arai, Keiichiro Koiwai, Reiko Nozaki, Hidehiro Kondo, Ikuo Hirono, Hidekazu Suzuki, Mitsunobu Kamiya","doi":"10.1111/pre.12544","DOIUrl":"https://doi.org/10.1111/pre.12544","url":null,"abstract":"Dominance of one phase (i.e. diploid or haploid) has been reported in various isomorphic macroalgae; however, studies of the relative frequencies of the two phases are limited to a few taxa owing to the difficulty in identifying phases of sterile thalli. In <i>Dictyota dichotoma</i>, we have previously documented the dominance of fertile sporophytes. In the present study, the phase and sex ratios of sterile thalli of <i>D. dichotoma</i> were determined using newly developed sex-specific markers. Differentially expressed genes were detected by transcriptome analyses of female and male gametophytic strains and a sporophytic strain aiming to identify candidate sex-specific genes. These candidates were aligned with genome sequences on the sex chromosomes of <i>Ectocarpus siliculosus</i> and were identified as putative sex-specific genes of <i>D. dichotoma</i>. Two primer sets were designed to discriminate phase and sex by the presence or absence of PCR products, and these markers were applied to examine the phase and sex ratios of <i>D. dichotoma</i> in various habitats and seasons. The proportion of sporophytes against 33–50 thalli examined in each of the five habitats at Ebisu Island, Shizuoka Prefecture was 88–100%, and the proportion of fertile sporophytes against total sporophytes (fertility proportion) varied among the habitats (0–54%). The fertile sporophytes were remarkably larger than the sterile sporophytes. At Tateyama, Chiba Prefecture, the dominance of sporophytes occurred in all seasons. The fertility proportion of sporophyte was relatively high from February (62.4%) to May (91.9%) and lower than 23% in other seasons. When artificial substrates were anchored in the middle of the <i>D. dichotoma</i> population, newly recruited thalli were all sporophytes, suggesting infrequent reproduction via tetraspores in nature. Based on these findings, we discuss potential fitness differences between the phases of <i>D. dichotoma</i>.","PeriodicalId":20544,"journal":{"name":"Phycological Research","volume":"33 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139495318","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}

{"title":"Vegetation variety affected by local environments in a coral reef lagoon","authors":"Kandai Tozaki, Gregory N. Nishihara, Azusa Kawate, Teruko Konishi, Yoichi Sato, Michihiro Ito, Hiroyuki Fujimura, Atsuko Tanaka","doi":"10.1111/pre.12540","DOIUrl":"https://doi.org/10.1111/pre.12540","url":null,"abstract":"From shore to sea, coral reefs can generally be divided into a lagoon zone, a reef crest, and a fore reef. Environmental variables, such as nutrient fluxes, light availability, and water temperature, vary among the zones and influence the biodiversity of submerged macrophytes. Additionally, the biodiversity of vegetation within the lagoon appears to be affected by multiple and extremely localized conditions. We investigated the impact of small-scale variations on vegetation diversity, and implemented an ecological survey within a well-defined area inside of a lagoon at Bise Point, Okinawa, Japan. A total of 20 macroalgal species (four green algae, six brown algae, and ten red algae) and four seagrass species were identified from the surveyed quadrats over a period of 19 months, from October 2019 to March 2021. Patterns in species occurrence were spatially and temporally heterogeneous. Notably, water motion and sediment flux were highly variable among the monitoring sites. Redundancy analysis allowed us to evaluate the significance of environmental factors on the vegetation of each monitoring area. Six environmental factors were considered in this study, but their impacts on local vegetation were not equivalent. Redundancy analysis suggested that water depth, flow velocity, and the ratio of the small fraction of deposition particles were the three factors with the strongest influence on local vegetation. This study provides some crucial insights into the determinants of vegetation in a coral reef lagoon. Our findings suggest that the factors we examined exert more influence on the vegetation than seasonal effects.","PeriodicalId":20544,"journal":{"name":"Phycological Research","volume":"38 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139414916","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}

{"title":"Differential cell size reduction of two sympatric Epithemia (Bacillariophyta) taxa in Nakaikemi Wetland, Japan","authors":"Shiho Kamakura, Taisuke Ohtsuka, Tamotsu Nagumo, Shinya Sato","doi":"10.1111/pre.12542","DOIUrl":"https://doi.org/10.1111/pre.12542","url":null,"abstract":"We observed contrasting temporal changes in cell size between two <i>Epithemia</i> taxa. The life cycle of diatoms is closely linked to their cell size, with a gradual decrease during the vegetative stage and a recovery through sexual reproduction. Sexual reproduction is triggered when cells become smaller than a species-specific size threshold and receive species-specific environmental cues. Few studies have documented the life cycles and frequency of sexual reproduction in diatoms, combining field observations and laboratory culture. We collected two <i>Epithemia</i> taxa, <i>Epithemia gibba</i> var. <i>ventricosa</i> and <i>Epithemia</i> sp. from a pond in Nakaikemi Wetland, and measured their valve lengths monthly for almost 3 years. Additionally, we established cultures of both taxa to examine the rates of cell size reduction, which affect the duration of the vegetative stage. In the field, <i>E. gibba</i> var. <i>ventricosa</i> exhibited a wide range of cell sizes and signs of size recovery. Furthermore, the cultures of this taxon showed a clear decrease in cell size through division, suggesting that sexual reproduction is required for size recovery. On the other hand, <i>Epithemia</i> sp. showed no obvious change in cell size both in the field and in the laboratory. This suggests that either sexual reproduction is not necessary for this taxon to maintain its population or their life cycle extends over several years to several decades. Thus, our findings reveal congeneric taxa sharing a common habitat and substratum, yet exhibiting distinct sexual and asexual strategies. Furthermore, we question the validity of taxonomic classifications previously assigned to these diatoms based on the range of morphological characteristics observed in the present study.","PeriodicalId":20544,"journal":{"name":"Phycological Research","volume":"49 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139397369","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}

{"title":"Growth and photosynthetic physiology of holopelagic Sargassum (Phaeophyceae) under laboratory conditions","authors":"Román Manuel Vásquez-Elizondo, Erika Vázquez-Delfín, Daniel Robledo","doi":"10.1111/pre.12541","DOIUrl":"https://doi.org/10.1111/pre.12541","url":null,"abstract":"Species of holopelagic <i>Sargassum</i> are responsible for Caribbean golden tides, commonly known as ‘<i>Sargassum</i> events’. These events mainly comprise <i>Sargassum fluitans</i> and <i>Sargassum natans</i> I, which are exposed to high levels of irradiance, but also self-shading within their floating masses. In this study, we grew <i>S. fluitans</i> and <i>S. natans</i> I and acclimated them to low-light conditions at 23°C in the laboratory to explore their responses to increasing light intensities. Photosynthesis, respiration, growth, and pigment content were evaluated over 3 weeks. <i>S. fluitans</i> and <i>S. natans</i> I photoacclimate to higher irradiances by decreasing their chlorophyll <i>a</i> and <i>c</i> contents. An increase in maximum photosynthesis and respiration rates was observed under high light, although differences occurred in the saturation irradiance and the initial slope of the photosynthesis versus irradiance curve. These adjustments were reflected in <i>S. fluitans</i> daily growth (from 2% to 7% d⁻¹ at low to high light, respectively) and tissue nitrogen content (1.6–2.7%) but were absent in <i>S. natans</i> I (~1% d⁻¹). The photosynthetic physiology of <i>S. fluitans</i> under these conditions suggests lower light requirements without compromising growth; however, under high light a higher photosynthetic performance was observed. Combining physiological and growth studies in holopelagic <i>Sargassum</i> species will serve as a baseline to understand and explain the success and overgrowth of these species along the Caribbean coast.","PeriodicalId":20544,"journal":{"name":"Phycological Research","volume":"57 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139054493","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}

{"title":"Optimizing cultivation and shipping environments for an edible green alga, Caulerpa chemnitzia var. laetevirens (Bryopsidales) from Japan: Effects of temperature, irradiance, desiccation and salinity on photochemical efficiency","authors":"Ryuta Terada, Koki Matsuda, Gregory N. Nishihara","doi":"10.1111/pre.12539","DOIUrl":"https://doi.org/10.1111/pre.12539","url":null,"abstract":"The effects of four stressors, temperature, irradiance, desiccation and salinity, on the photochemical efficiency (Δ&lt;i&gt;F/&lt;/i&gt;&lt;mjx-container aria-label=\"upper F prime Subscript m\" ctxtmenu_counter=\"0\" ctxtmenu_oldtabindex=\"1\" jax=\"CHTML\" role=\"application\" sre-explorer- style=\"font-size: 103%; position: relative;\" tabindex=\"0\"&gt;&lt;mjx-math aria-hidden=\"true\" location=\"graphic/pre12539-math-0001.png\"&gt;&lt;mjx-semantics&gt;&lt;mjx-mrow&gt;&lt;mjx-msubsup data-semantic-children=\"0,1,2\" data-semantic-collapsed=\"(4 (3 0 1) 2)\" data-semantic- data-semantic-role=\"latinletter\" data-semantic-speech=\"upper F prime Subscript m\" data-semantic-type=\"subsup\"&gt;&lt;mjx-mi data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"italic\" data-semantic- data-semantic-parent=\"4\" data-semantic-role=\"latinletter\" data-semantic-type=\"identifier\"&gt;&lt;mjx-c&gt;&lt;/mjx-c&gt;&lt;/mjx-mi&gt;&lt;mjx-script style=\"vertical-align: -0.247em; margin-left: -0.106em;\"&gt;&lt;mjx-mo data-semantic- data-semantic-parent=\"4\" data-semantic-role=\"prime\" data-semantic-type=\"punctuation\" size=\"s\" style=\"margin-left: 0.228em;\"&gt;&lt;mjx-c&gt;&lt;/mjx-c&gt;&lt;/mjx-mo&gt;&lt;mjx-spacer style=\"margin-top: 0.328em;\"&gt;&lt;/mjx-spacer&gt;&lt;mjx-mi data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"italic\" data-semantic- data-semantic-parent=\"4\" data-semantic-role=\"latinletter\" data-semantic-type=\"identifier\" size=\"s\"&gt;&lt;mjx-c&gt;&lt;/mjx-c&gt;&lt;/mjx-mi&gt;&lt;/mjx-script&gt;&lt;/mjx-msubsup&gt;&lt;/mjx-mrow&gt;&lt;/mjx-semantics&gt;&lt;/mjx-math&gt;&lt;mjx-assistive-mml aria-hidden=\"true\" display=\"inline\" unselectable=\"on\"&gt;&lt;math altimg=\"urn:x-wiley:13220829:media:pre12539:pre12539-math-0001\" display=\"inline\" location=\"graphic/pre12539-math-0001.png\" overflow=\"scroll\" xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;semantics&gt;&lt;mrow&gt;&lt;msubsup data-semantic-=\"\" data-semantic-children=\"0,1,2\" data-semantic-collapsed=\"(4 (3 0 1) 2)\" data-semantic-role=\"latinletter\" data-semantic-speech=\"upper F prime Subscript m\" data-semantic-type=\"subsup\"&gt;&lt;mi data-semantic-=\"\" data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"italic\" data-semantic-parent=\"4\" data-semantic-role=\"latinletter\" data-semantic-type=\"identifier\"&gt;F&lt;/mi&gt;&lt;mi data-semantic-=\"\" data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"italic\" data-semantic-parent=\"4\" data-semantic-role=\"latinletter\" data-semantic-type=\"identifier\"&gt;m&lt;/mi&gt;&lt;mo data-semantic-=\"\" data-semantic-parent=\"4\" data-semantic-role=\"prime\" data-semantic-type=\"punctuation\"&gt;′&lt;/mo&gt;&lt;/msubsup&gt;&lt;/mrow&gt;$$ {F}_m^{prime } $$&lt;/annotation&gt;&lt;/semantics&gt;&lt;/math&gt;&lt;/mjx-assistive-mml&gt;&lt;/mjx-container&gt;) of an edible green alga, &lt;i&gt;Caulerpa chemnitzia&lt;/i&gt; var. &lt;i&gt;laetevirens&lt;/i&gt; from Kagoshima, Japan, were determined for optimizing cultivation and shipping environments using a pulse amplitude modulation-chlorophyll fluorometer. The Δ&lt;i&gt;F/&lt;/i&gt;&lt;mjx-container aria-label=\"upper F prime Subscript m\" ctxtmenu_counter=\"1\" ctxtmenu_oldtabindex=\"1\" jax=\"CHTML\" role=\"application\" sre-explorer- style=\"font-size: 103%; position: relative;\" tabindex=\"0\"&gt;&lt;mjx-math aria-hidden=\"true\" location=\"graph","PeriodicalId":20544,"journal":{"name":"Phycological Research","volume":"14 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139064995","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}

{"title":"A study of Klisinema koreana sp. nov. (Desertifilaceae, Cyanobacteria) from the Republic of Korea based on morphological, ecological and molecular analyses","authors":"So-Won Kim, Nam-Ju Lee, Ji-Ho Song, Ok-Min Lee","doi":"10.1111/pre.12536","DOIUrl":"https://doi.org/10.1111/pre.12536","url":null,"abstract":"Genus <i>Klisinema</i> (Desertifilaceae, Desertifilales) has only one species, <i>Klisinema persicum</i>, reported worldwide, and this species was found in soils around thermal springs (50°C) of high radiation regions. Simple filament cyanobacteria belonging to the genus <i>Klisinema</i> were collected from Korea, and cultured samples were studied through morphological, ecological and molecular analyses. Both Korean <i>K. persicum</i> and <i>Klisinema koreana</i> were found as epilithic species in freshwater gravel, which have different ecological characteristics from previously reported <i>K. persicum</i>. As a result of morphological analysis, keritomized cytoplasm was observed in <i>K. koreana</i>, and this feature was also newly observed in <i>K. persicum</i> that was discovered in Korea. In addition, <i>K. koreana</i> has a larger width/length ratio compared to <i>K. persicum</i>, and both species have an irregular thylakoid arrangement. Furthermore, as a result of phylogenetic analysis of 16S rRNA, the genus <i>Klisinema</i> formed a monophyletic lineage, and <i>K. koreana</i> strains were clearly separated from <i>K. persicum</i> strains to form a phylogenetic tree. Moreover, when comparing the secondary structure of the 16S–23S internal transcribed spacer region, <i>K. koreana</i> has a structural difference from <i>K. persicum</i>, especially in the structure of the Box-B helix. Therefore, <i>Klisinema koreana</i> sp. nov. was proposed as a new species belonging to the genus <i>Klisinema</i> of family Desertifilaceae.","PeriodicalId":20544,"journal":{"name":"Phycological Research","volume":"97 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138715898","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}