The Experts below are selected from a list of 90 Experts worldwide ranked by ideXlab platform
Qiaoping Xiang - One of the best experts on this subject based on the ideXlab platform.
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correction to directed repeats co occur with few short dispersed repeats in plastid genome of a spikemoss selaginella vardei selaginellaceae Lycopodiopsida
BMC Genomics, 2019Co-Authors: Hongrui Zhang, Xianchun Zhang, Qiaoping XiangAbstract:Following the publication of this article [1], the authors reported that the Fig. 2 described in the article had a mistake that two grey blocks in S. moellendorffii was not placed as background color, and in the Fig. 2 legend, chlL-chlN was wrongly written into chlL-chlL. They have therefore provided the following alternative Fig. 2 in this Correction article in order to show the accurate information.
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directed repeats co occur with few short dispersed repeats in plastid genome of a spikemoss selaginella vardei selaginellaceae Lycopodiopsida
BMC Genomics, 2019Co-Authors: Hongrui Zhang, Xianchun Zhang, Qiaoping XiangAbstract:It is hypothesized that the highly conserved inverted repeats (IR) structure of land plant plastid genomes (plastomes) is beneficial for stabilizing plastome organization, whereas the mechanism of the occurrence and stability maintenance of the recently reported direct repeats (DR) structure is yet awaiting further exploration. Here we describe the DR structure of the Selaginella vardei (Selaginellaceae) plastome, to elucidate the mechanism of DR occurrence and stability maintenance. The plastome of S. vardei is 121,254 bp in length and encodes 76 genes, of which 62 encode proteins, 10 encode tRNAs, and four encode rRNAs. Unexpectedly, the two identical rRNA gene regions (13,893 bp) are arranged in a direct orientation (DR), rather than inverted. Comparing to the IR organization in Isoetes flaccida (Isoetaceae, Lycopodiopsida) plastome, a ca. 50-kb trnN-trnF inversion that spans one DR copy was found in the plastome of S. vardei, which might cause the orientation change. In addition, we find extremely rare short dispersed repeats (SDRs) in the plastomes of S. vardei and its closely related species S. indica. We suggest that the ca. 50-kb inversion resulted in the DR structure, and the reduction in SDRs plays a key role in maintaining the stability of plastomes with DR structure by avoiding potential secondary recombination. We further confirmed the presence of homologous recombination between DR regions, which are able to generate subgenomes and form diverse multimers. Our study deepens the understanding of Selaginella plastomes and provides new insights into the diverse plastome structures in land plants.
Hongrui Zhang - One of the best experts on this subject based on the ideXlab platform.
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correction to directed repeats co occur with few short dispersed repeats in plastid genome of a spikemoss selaginella vardei selaginellaceae Lycopodiopsida
BMC Genomics, 2019Co-Authors: Hongrui Zhang, Xianchun Zhang, Qiaoping XiangAbstract:Following the publication of this article [1], the authors reported that the Fig. 2 described in the article had a mistake that two grey blocks in S. moellendorffii was not placed as background color, and in the Fig. 2 legend, chlL-chlN was wrongly written into chlL-chlL. They have therefore provided the following alternative Fig. 2 in this Correction article in order to show the accurate information.
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directed repeats co occur with few short dispersed repeats in plastid genome of a spikemoss selaginella vardei selaginellaceae Lycopodiopsida
BMC Genomics, 2019Co-Authors: Hongrui Zhang, Xianchun Zhang, Qiaoping XiangAbstract:It is hypothesized that the highly conserved inverted repeats (IR) structure of land plant plastid genomes (plastomes) is beneficial for stabilizing plastome organization, whereas the mechanism of the occurrence and stability maintenance of the recently reported direct repeats (DR) structure is yet awaiting further exploration. Here we describe the DR structure of the Selaginella vardei (Selaginellaceae) plastome, to elucidate the mechanism of DR occurrence and stability maintenance. The plastome of S. vardei is 121,254 bp in length and encodes 76 genes, of which 62 encode proteins, 10 encode tRNAs, and four encode rRNAs. Unexpectedly, the two identical rRNA gene regions (13,893 bp) are arranged in a direct orientation (DR), rather than inverted. Comparing to the IR organization in Isoetes flaccida (Isoetaceae, Lycopodiopsida) plastome, a ca. 50-kb trnN-trnF inversion that spans one DR copy was found in the plastome of S. vardei, which might cause the orientation change. In addition, we find extremely rare short dispersed repeats (SDRs) in the plastomes of S. vardei and its closely related species S. indica. We suggest that the ca. 50-kb inversion resulted in the DR structure, and the reduction in SDRs plays a key role in maintaining the stability of plastomes with DR structure by avoiding potential secondary recombination. We further confirmed the presence of homologous recombination between DR regions, which are able to generate subgenomes and form diverse multimers. Our study deepens the understanding of Selaginella plastomes and provides new insights into the diverse plastome structures in land plants.
Xianchun Zhang - One of the best experts on this subject based on the ideXlab platform.
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correction to directed repeats co occur with few short dispersed repeats in plastid genome of a spikemoss selaginella vardei selaginellaceae Lycopodiopsida
BMC Genomics, 2019Co-Authors: Hongrui Zhang, Xianchun Zhang, Qiaoping XiangAbstract:Following the publication of this article [1], the authors reported that the Fig. 2 described in the article had a mistake that two grey blocks in S. moellendorffii was not placed as background color, and in the Fig. 2 legend, chlL-chlN was wrongly written into chlL-chlL. They have therefore provided the following alternative Fig. 2 in this Correction article in order to show the accurate information.
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directed repeats co occur with few short dispersed repeats in plastid genome of a spikemoss selaginella vardei selaginellaceae Lycopodiopsida
BMC Genomics, 2019Co-Authors: Hongrui Zhang, Xianchun Zhang, Qiaoping XiangAbstract:It is hypothesized that the highly conserved inverted repeats (IR) structure of land plant plastid genomes (plastomes) is beneficial for stabilizing plastome organization, whereas the mechanism of the occurrence and stability maintenance of the recently reported direct repeats (DR) structure is yet awaiting further exploration. Here we describe the DR structure of the Selaginella vardei (Selaginellaceae) plastome, to elucidate the mechanism of DR occurrence and stability maintenance. The plastome of S. vardei is 121,254 bp in length and encodes 76 genes, of which 62 encode proteins, 10 encode tRNAs, and four encode rRNAs. Unexpectedly, the two identical rRNA gene regions (13,893 bp) are arranged in a direct orientation (DR), rather than inverted. Comparing to the IR organization in Isoetes flaccida (Isoetaceae, Lycopodiopsida) plastome, a ca. 50-kb trnN-trnF inversion that spans one DR copy was found in the plastome of S. vardei, which might cause the orientation change. In addition, we find extremely rare short dispersed repeats (SDRs) in the plastomes of S. vardei and its closely related species S. indica. We suggest that the ca. 50-kb inversion resulted in the DR structure, and the reduction in SDRs plays a key role in maintaining the stability of plastomes with DR structure by avoiding potential secondary recombination. We further confirmed the presence of homologous recombination between DR regions, which are able to generate subgenomes and form diverse multimers. Our study deepens the understanding of Selaginella plastomes and provides new insights into the diverse plastome structures in land plants.
Wagner Macedo Da ,silva - One of the best experts on this subject based on the ideXlab platform.
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OCORRÊNCIA DE Lycopodiella cernnua (L.) PICHI-SERMOLLI (PTERIDOPHYTA: Lycopodiopsida: LYCOPODIACEAE) NAS BORDAS DE MANGUEZAL, SÃO LUÍS – MARANHÃO - BRASIL
Boletim do Laboratório de Hidrobiologia, 2014Co-Authors: Andrea Christina Gomes De ,azevedo, Wagner Macedo Da ,silvaAbstract:The occurrence of Lycopodiella cernnua (L.) Pichi-Sermolli (Pteridophyte: Lycopodiopsida: Lycopodiaceae) on mangrove bordering areas, São Luís – MA - Brazil. The Pteridophyte division is represented by vascular criptogams of very varied habits, which may range from arborescent forms, of erect stems and large leaves up to small size, almost microscopic forms. Lycopodiella cernnua specimens were collected, on the margins of Parna Açu’s mangrove, located in the southwest of the São Luís Island. Pteridophytes specimens were observed with great frequency on a hillside located on the bordering area of this mangrove where high humidity rates were recorded. Regarding the habitat, they are terrestrial, of open and humid sites, such as ravines; they are virtually cosmopolitan and very variable. Key words: Pteridophyte, Lycopodiella cernnua, mangrove.
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ocorrencia de lycopodiella cernnua l pichi sermolli pteridophyta Lycopodiopsida lycopodiaceae nas bordas de manguezal sao luis maranhao brasil
Boletim do Laboratório de Hidrobiologia, 2001Co-Authors: Andrea Christina Gomes De ,azevedo, Wagner Macedo Da ,silvaAbstract:The occurrence of Lycopodiella cernnua (L.) Pichi-Sermolli (Pteridophyte: Lycopodiopsida: Lycopodiaceae) on mangrove bordering areas, Sao Luis – MA - Brazil . The Pteridophyte division is represented by vascular criptogams of very varied habits, which may range from arborescent forms, of erect stems and large leaves up to small size, almost microscopic forms. Lycopodiella cernnua specimens were collected, on the margins of Parna Acu’s mangrove, located in the southwest of the Sao Luis Island. Pteridophytes specimens were observed with great frequency on a hillside located on the bordering area of this mangrove where high humidity rates were recorded. Regarding the habitat, they are terrestrial, of open and humid sites, such as ravines; they are virtually cosmopolitan and very variable. Key words: Pteridophyte, Lycopodiella cernnua , mangrove.
Xinmao Zhou - One of the best experts on this subject based on the ideXlab platform.
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spinulum lioui a new species referred as to lycopodium neopungens Lycopodiopsida lycopodiaceae in china
Phytotaxa, 2017Co-Authors: Dekui Chen, Xinmao Zhou, Libing ZhangAbstract:One earlier known species of Lycopodium from China, “ L. neopungens H.S. Kung & Li Bing Zhang”, is described as Spinulum lioui Li Bing Zhang & H.He (sp. nov.).
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huperzia wusugongii nom nov Lycopodiopsida huperziaceae from west china
Phytotaxa, 2017Co-Authors: Xinmao Zhou, Libing ZhangAbstract:A new name of the lycophyte genus Huperzia (Huperziaceae), H. wusugongii Li Bing Zhang, X.G. Xu & X.M. Zhou, from west China is proposed to replace the later homonym, H. rubricaulis S.K. Wu & X. Cheng [‘ rubicaulis ’], of H. rubricaulis (Alderwerelt van Rosenburgh) Holub.
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dendrolycopodium verticale comb nov Lycopodiopsida lycopodiaceae from china
Phytotaxa, 2017Co-Authors: Xinmao Zhou, Libing ZhangAbstract:A new combination in the lycophyte genus Dendrolycopodium (Lycopodiacae) from Lycopodium , D. verticale (Li Bing Zhang) Li Bing Zhang & X.M.Zhou, for a Chinese species is made.
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a large scale phylogeny of the lycophyte genus selaginella selaginellaceae Lycopodiopsida based on plastid and nuclear loci
Cladistics, 2016Co-Authors: Xinmao Zhou, Liang Zhang, Carl J Rothfels, Timothee Le Pechon, Ralf Knapp, David H Lorence, Xin-fen GaoAbstract:The lycophyte genus Selaginella alone constitutes the family Selaginellaceae, the largest of the lycophyte families. The genus is estimated to contain 700–800 species distributed on all continents except Antarctica, with highest species diversity in tropical and subtropical regions. The monophyly of Selaginella in this broad sense has rarely been doubted, whereas its intrageneric classification has been notoriously contentious. Previous molecular studies were based on very sparse sampling of Selaginella (up to 62 species) and often used DNA sequence data from one genome. In the present study, DNA sequences of one plastid (rbcL) and one nuclear (ITS) locus from 394 accessions representing approximately 200 species of Selaginella worldwide were used to infer a phylogeny using maximum likelihood, Bayesian inference and maximum parsimony methods. The study identifies strongly supported major clades and well resolves relationships among them. Major results include: (i) six deep-level clades are discovered representing the deep splits of Selaginella; and (ii) 20 major clades representing 20 major evolutionary lineages are identified, which differ from one another in molecular, macro-morphological, ecological and spore features, and/or geographical distribution.
