Phycological Research最新文献

{"title":"Novelties in nomenclature and typification appearing in Phycological Research 71 (2).","authors":"","doi":"10.1111/pre.12519","DOIUrl":"https://doi.org/10.1111/pre.12519","url":null,"abstract":"","PeriodicalId":20544,"journal":{"name":"Phycological Research","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45851453","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":"Galactolipid composition of the star‐shaped dinoflagellate Asterodinium gracile (Kareniaceae): presence of hexadecatetraenoic acid (16:4(n‐3))‐containing monogalactosyldiacylglycerol as the predominant galactolipid and chemotaxonomic closeness to Karenia mikimotoi as the only other known Kareniacean","authors":"Jeffrey D. Leblond, Braedyn E. Hollingsworth, Daniel Ayoub, Mackenzie B. Mckinnon, Chelsea S. Myers, Tawakalit J. Busari, Kyra Sabir","doi":"10.1111/pre.12518","DOIUrl":"https://doi.org/10.1111/pre.12518","url":null,"abstract":"Asterodinium gracile is a morphologically distinct, star‐shaped member of the Kareniaceae with, like canonical Kareniaceae, a tertiary plastid of haptophyte origin. However, A. gracile's complement of carotenoid photosynthetic pigments has been shown to be chemotaxonomically atypical in that it possesses much less fucoxanthin when compared to that of other, canonical Kareniaceae in the genera Karenia, Karlodinium, and Takayama, also with a tertiary plastid of haptophyte origin. To date, Karenia mikimotoi, Karenia papilionacea, and Karenia selliformis are the only canonical Kareniaceae that have been shown to have a chemotaxonomically atypical carotenoid pigment composition in that they possess a gyroxanthin diester‐like carotenoid not observed in other species of Karenia, Karlodinium, or Takayama (recognizing that Karenia, in general, produces fucoxanthin derivatives not observed in Karlodinium or Takayama). As a photosynthetic organism, K. mikimotoi has been shown to resemble Karenia brevis such that both species possess the chloroplast‐associated galactolipids mono‐ and digalactosyldiacylglycerol (MGDG and DGDG, respectively) enriched with octadecapentaenoic acid (18:5(n‐3)) in the sn‐1 position, and hexadecenoic acid (16:0) and tetradecanoic acid (14:0) at the sn‐2 position. However, K. mikimotoi is chemotaxonomically atypical beyond its carotenoid composition in that it possesses MGDG and DGDG with hexadecatetraenoic acid (16:4(n‐3)), which has not been observed in any other members of the Kareniaceae, in the sn‐2 position as major galactolipids. The goal of this study was to characterize the galactolipids of A. gracile with the hypothesis that they would also be atypical when compared to other canonical Kareniaceae because of A. gracile's atypical carotenoid pigment composition. To this end, we report that like K. brevis and K. mikimotoi, A. gracile produces MGDG and DGDG enriched in 18:5(n‐3) at the sn‐1 position and C14 fatty acids, such as 14:0, at the sn‐2 position, and like K. mikimotoi, it produces 18:5(n‐3)/16:4(n‐3) MGDG, yet here as its most abundant galactolipid.","PeriodicalId":20544,"journal":{"name":"Phycological Research","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2023-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43253030","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":"Stenomitos terricola sp. nov. (Leptolyngbyaceae, Cyanobacteria) from the moist soil of Mt. Gwanggyo, Republic of Korea","authors":"Nam‐Ju Lee, Do‐Hyun Kim, Ok‐Min Lee","doi":"10.1111/pre.12517","DOIUrl":"https://doi.org/10.1111/pre.12517","url":null,"abstract":"Stenomitos terricola FBCC‐A190 was collected from soils around the trees of Mt. Gwanggyo, located in Yeongtong‐gu, Suwon‐si, Gyeonggi‐do. S. terricola FBCC‐A190 is a thin and simple filament with a cell length that is longer than its width. It has a thin and firm sheath, exhibiting a blue‐green color. Species belonging to genus Stenomitos is semi‐cryptic species with slight morphological differences from each other. They were confirmed as Stenomitos species by analysis using 16S rRNA and 16S–23S ITS. A monophyletic cluster was formed with the previously reported genus Stenomitos, with 16S rRNA gene sequences sharing similarities of 95.9–97.9% except for S. pantisii TAU‐MAC 4318. In addition, 16S–23S ITS gene sequencing showed tRNAAla, tRNAIle and V2, similar to the previously reported genus Stenomitos. From these results, Stenomitos terricola sp. nov. was proposed as a new species belonging to genus Stenomitos.","PeriodicalId":20544,"journal":{"name":"Phycological Research","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2023-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49355100","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":"Drouetiella epilithica sp. nov. and Drouetiella lurida (Oculatellaceae, Synechococcales) isolated in the Republic of Korea based on the polyphasic approach","authors":"Do‐Hyun Kim, Nam‐Ju Lee, Hye‐Ryeung Wang, A. Lim, Ok‐Min Lee","doi":"10.1111/pre.12515","DOIUrl":"https://doi.org/10.1111/pre.12515","url":null,"abstract":"Five strains of Drouetiella (ACKU666, 667, 668, 669 and 670) were isolated from gravels in water, stone monument and coastal mudflat in Korea, and were studied using morphological and molecular traits. All five strains had thin and simple trichomes and exhibited false branching. From these strains, four strains (ACKU666, 667, 668 and 669) exhibited similar cell lengths with reddish–brown colored cells such as Drouetiella lurida. The 16S rRNA gene phylogeny showed the four strains formed a clade with Drouetiella lurida, and their DNA similarity was calculated to be 99.1–100%. The color of strain ACKU670 appeared to be in bright blue–green color like Drouetiella fasciculata, and their thylakoids showed a parietal arrangement, which is a characteristic feature of the family Oculatellaceae. Strain ACKU670 turned out to be a sister clade to the D. lurida according to the phylogenetic analysis of the 16S rRNA gene. The 16–23S rRNA internal transcribed spacer secondary folding structure (D1–D1′, Box‐B and V3 helices) confirmed the uniqueness of strain ACKU670, therefore indicating differences from the related species. Considering all the results, we described our strain ACKU670 as Drouetiella epilithica sp. nov. in accordance with the International Code of Nomenclature for Algae, Fungi and Plants.","PeriodicalId":20544,"journal":{"name":"Phycological Research","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2023-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48539550","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":"Species diversity and distribution of the calcareous green macroalgae Halimeda in Taiwan, Spratly Island, and Dongsha Atoll, with the proposal of Halimeda taiwanensis sp. nov.","authors":"Sinjai Phetcharat, Kattika Pattarach, Pin-Chen Chen, Wei-Lung Wang, Shao‐Lun Liu, J. Mayakun","doi":"10.1111/pre.12516","DOIUrl":"https://doi.org/10.1111/pre.12516","url":null,"abstract":"The calcified green algal genus Halimeda is one of the most ecologically important but morphologically diverse seaweeds in sub‐tropical and tropical waters. Because of its high morphological plasticity, the identification of Halimeda species based on morphological characters is challenging without the assistance of molecular analysis. To date, the species diversity of Halimeda in Taiwan and its overseas territories has not been investigated with the assistance of DNA sequencing, and this taxonomic knowledge gap should be filled. The present study initiates a systematic examination of the species diversity and distribution of Halimeda in Taiwan, Spratly Island, and Dongsha Atoll in the South China Sea, using DNA sequence data (plastid tufA gene and rbcL) and morphological data. Our DNA analyses revealed the presence of 10 Halimeda species (Halimeda borneensis, Halimeda cylindracea, Halimeda discoidea, Halimeda distorta, Halimeda macroloba, Halimeda minima, Halimeda opuntia, Halimeda renschii, Halimeda taiwanensis sp. nov., and Halimeda velasquezii) in the waters around Taiwan, Spratly Island, and Dongsha Atoll. The majority of the species could be readily distinguished by their morphological and anatomical characters. The proposed new species, H. taiwanensis, was differentiated not only by our algorithmic species delimitation analyses (statistical parsimony network analysis and automated barcode gap discovery), but also by its morphological features. The proposed new species differs from two externally resembled species, H. cuneata and H. discoidea, in having an undulated segment margin, the complete fusion of medullary siphons at the node, the lack of segment stalk, and the presence of a large primary utricle. Here, we present the up‐to‐date taxonomic account, molecular diversity, and geographical distribution of Halimeda spp. in Taiwan and associated areas of the South China Sea. Environmental factors that might drive the occurrence and latitudinal distribution of the species are also discussed.","PeriodicalId":20544,"journal":{"name":"Phycological Research","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2023-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49075621","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":"New record of Sporochnus dotyi (Sporochnales, Phaeophyceae) from Kii Peninsula, Japan","authors":"H. Kawai, A. Sherwood, S. Ui, T. Hanyuda","doi":"10.1111/pre.12514","DOIUrl":"https://doi.org/10.1111/pre.12514","url":null,"abstract":"The subtidal brown algal species Sporochnus dotyi Brostoff (Sporochnales, Phaeophyceae), which has been regarded as a Hawaiian endemic, is reported from Kushimoto, Kii Peninsula, Pacific coast of central Honshu, Japan, for the first time outside Hawai'i. The species grew on subtidal rocks ca. 5–20 m deep attached by a small conical holdfast. The erect thalli were 5–30 cm high, terete, robust and alternately branched in 1–2 orders. When mature, pedicellate receptacles developed on the branches, and formed elliptical sori 1 mm long with a pedicel 3–5 mm long. The apical parts of the thalli and the receptacles were terminated with a tuft of simple assimilatory filaments of up to 4 mm long and showed prominent green to yellow underwater iridescence. Reproductive filaments (paraphyses) were densely packed, simple, up to 200 μm long and bore 4–6 mostly unilateral unilocular zoidangia 20–22 μm long and 5–6 m in diameter. In the genetic analyses, the Sporochnus alga from Kushimoto had partial rbcL sequence identical to S. dotyi from Hawai'i. The cox3 phylogeny revealed that this alga formed a fully supported clade with S. dotyi. Therefore, we identified the alga from Kushimoto as S. dotyi. This finding of S. dotyi from Japan, together with the recent reports of the mesophotic macroalgae Ryuguphycus kuaweuweu (=Umbraulva kuaweuweu), Ulva iliohaha and Newhousia imbricata from various localities in the Pacific Ocean including Japan, suggest closer biogeographical connections of subtidal/mesophotic macroalgae in the Pacific than previously recognized.","PeriodicalId":20544,"journal":{"name":"Phycological Research","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2023-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46813875","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":"Establishing a new genus, Chiharadinium gen. nov. (Peridiniales, Dinophyceae) for a tidal pool dinoflagellate formerly known as Scrippsiella hexapraecingula","authors":"Mahmutjan Dawut, Aika Yamaguchi, T. Horiguchi","doi":"10.1111/pre.12513","DOIUrl":"https://doi.org/10.1111/pre.12513","url":null,"abstract":"To determine its accurate taxonomic position, a tidal pool bloom‐forming dinoflagellate, Scrippsiella hexapraecingula was re‐investigated using light, scanning and transmission electron microscopy together with a phylogenetic analysis based on concatenated ribosomal DNA sequences. The culture strains used in this study were established from intertidal rock pool samples taken from Jogashima, Kanagawa prefecture and Heisaura, Chiba prefecture, Japan and were identified as S. hexapraecingula originally described by Horiguchi and Chihara from a tidal pool in Hachijo Island, Tokyo, Japan in 1983. The thecal plate arrangement was determined as Po, X, 4′, 3a, 6″, 6c, 5s, 5″′, 2″″. The internal structure was investigated for the first time. The organism has typical dinoflagellate cellular organelles such as a dinokaryotic nucleus, mitochondria with tubular cristae, trichocysts and pusule. The chloroplast was single and connected to the central pyrenoid (stalked type). The eyespot found in the sulcus is of the B type with two rows of superficial intraplastidal lipid globules directly overlain by an extraplastidal single layer of crystalline bricks enveloped by a common membrane. The apical pore is plugged by a double‐layered stub‐like structure. Stalk building material for attachment covered the apical pore. Phylogenetic analysis indicated that S. hexapraecingula was most closely related to a freshwater dinoflagellate, Peridiniopsis borgei, the type species of the genus Peridiniopsis. However, clear differences exist between these two organisms, including their thecal plate arrangement, habitat and habit. As a result, a new genus, Chiharadinium Dawut & T. Horiguchi gen. nov. has been proposed rather than attempting to accommodate S. hexapraecingula in the genus Peridiniopsis. The new combination, Chiharadinium hexapraecingulum (T. Horiguchi & Chihara) Dawut & T. Horiguchi comb. nov. has been proposed.","PeriodicalId":20544,"journal":{"name":"Phycological Research","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2023-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45228429","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":"Simultaneous visualization of the actin plate and new cell partition membrane during cytokinesis in the brown alga Sphacelaria rigidula (Sphacelariales, Phaeophyceae)","authors":"Hinako Aoki, C. Katsaros, T. Motomura, Chikako Nagasato","doi":"10.1111/pre.12512","DOIUrl":"https://doi.org/10.1111/pre.12512","url":null,"abstract":"In many brown algae, cytokinesis is accomplished through the centrifugal expansion of the membrane structure formed by the fusion of Golgi vesicles and flat cisternae. In contrast, it has been reported that cytokinesis in Sphacelaria rigidula progresses centripetally by adding Golgi vesicles and flat cisternae to cleaving furrows of the plasma membrane. The reason why this cytokinetic pattern was observed only in Sphacelaria species is unknown. In either cytokinesis pattern, a plate‐like actin structure (the actin plate) coincides with the cytokinetic plane between the daughter nuclei. However, it is unclear how the actin plate is related to cytokinesis progression. In this study, we re‐examined cytokinesis in the apical cells of S. rigidula using transmission electron microscopy. Double staining of the actin plate and the developing membrane was followed by fluorescence microscopy analysis to determine the relationship between these two formations. The results showed that cytokinesis in S. rigidula, as in many brown algae, was completed by centrifugal growth of the new cell partition membrane. A furrow of the plasma membrane was observed at the beginning of cytokinesis; however, further invagination did not occur. The actin plate arose at the center of the cytokinetic plane before membrane fusion and extended parallel to the expansion of the new cell partition membrane. When cytokinesis was slow due to insufficient Golgi vesicle supply to the cytokinetic plane in the cells under brefeldin A treatment, the extension of the actin plate was also suspended. In this study, the spatiotemporal relationship between the occurrence and expansion of the actin plate and the new cell partition membrane was revealed. These observations indicate that the actin plate might promote membrane fusion or lead to the growth of a new cell partition membrane.","PeriodicalId":20544,"journal":{"name":"Phycological Research","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2023-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46270150","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 71 (1).","authors":"","doi":"10.1111/pre.12511","DOIUrl":"https://doi.org/10.1111/pre.12511","url":null,"abstract":"","PeriodicalId":20544,"journal":{"name":"Phycological Research","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49077410","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":"Issue Information","authors":"","doi":"10.1111/pre.12492","DOIUrl":"https://doi.org/10.1111/pre.12492","url":null,"abstract":"Beautiful underwater view of an edible brown alga, Sargassum fusiforme (Fucales, Phaeophyceae) at the rocky shore in Sakurajima, Kagoshima, Japan (Photo by Ryuta Terada). Characteristic responses of the PSII photochemical efficiency on desiccation and salinity gradients in S. fusiforme are reported by Yonemori et al. in this issue.","PeriodicalId":20544,"journal":{"name":"Phycological Research","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44397596","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}