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Musselman, Lytton J. - One of the best experts on this subject based on the ideXlab platform.
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Figure 4 from: Schafran PW, Leonard SW, Bray RD, Taylor WC, Musselman LJ (2016) Isoetes mississippiensis: A new quillwort from Mississippi, USA. PhytoKeys 74: 97-106. https://doi.org/10.3897/phytokeys.74.10380
2016Co-Authors: Schafran, Peter W., Bray, Rebecca D., Leonard, Steven W., Taylor W. Carl, Musselman, Lytton J.Abstract:Figure 4 - Map showing two localities of Isoetes mississippiensis. Inset: Map of Mississippi with detail area highlighted. Map created using ArcGIS software (Esri)
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Figure 3 from: Schafran PW, Leonard SW, Bray RD, Taylor WC, Musselman LJ (2016) Isoetes mississippiensis: A new quillwort from Mississippi, USA. PhytoKeys 74: 97-106. https://doi.org/10.3897/phytokeys.74.10380
2016Co-Authors: Schafran, Peter W., Bray, Rebecca D., Leonard, Steven W., Taylor W. Carl, Musselman, Lytton J.Abstract:Figure 3 - Light microscope image of megaspores of Isoetes mississippiensis from Schafran MS-07 (left) and MS-08 (right). Magnification 63×. Scale bar = 0.3 mm
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Figure 1 from: Schafran PW, Leonard SW, Bray RD, Taylor WC, Musselman LJ (2016) Isoetes mississippiensis: A new quillwort from Mississippi, USA. PhytoKeys 74: 97-106. https://doi.org/10.3897/phytokeys.74.10380
2016Co-Authors: Schafran, Peter W., Bray, Rebecca D., Leonard, Steven W., Taylor W. Carl, Musselman, Lytton J.Abstract:Figure 1 - SEMs of megaspores (a, b, c) and microspores (d, e, f) of Isoetes mississippiensis displaying distal (a, d), equatorial (b, e), and proximal (c, f) views. Megaspores from Schafran MS-08, microspores from Taylor 6798. Megaspore magnification 200×; microspore magnification 2000×
Volker Knoop - One of the best experts on this subject based on the ideXlab platform.
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Additional file 2: Figure S1. of Reverse U-to-C editing exceeds C-to-U RNA editing in some ferns â a monilophyte-wide comparison of chloroplast and mitochondrial RNA editing suggests independent evolution of the two processes in both organelles
2016Co-Authors: Nils Knie, Felix Grewe, Simon Fischer, Volker KnoopAbstract:Comparison of mitochondrial RNA editing sites between monilophytes and lycophytes. The experimentally confirmed editing sites in the genes atp1 and nad5 of the monilophyte species Polypodium cambricum, Dicksonia antarctica and Azolla filiculoides are compared with the respective editing sites deposited in NCBI from the lycophytes Isoetes engelmannii and Selaginella moellendorffii. Only 16 edits are shared between all five taxa. Most of the edits from the two lycophytes are unique to either one species or are shared between the two lycophytes and are therefore most likely independent gains. For the basal lycophyte Phlegmariurus squarrosus only 14 edits (all of the C-to-U type) are found in our cDNA analysis. Three of these edits are shared between all three lycophytes and six between Phlegmariurus and Isoetes. (DOCX 127 kb
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A unique transcriptome: 1782 positions of RNA
2010Co-Authors: Felix Grewe, Bernd Weisshaar, Stefan Herres, Prisca Viehöver, Monika Polsakiewicz, Volker KnoopAbstract:editing alter 1406 codon identities in mitochondrial mRNAs of the lycophyte Isoetes engelmanni
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a trans splicing group i intron and trna hyperediting in the mitochondrial genome of the lycophyte Isoetes engelmannii
Nucleic Acids Research, 2009Co-Authors: Felix Grewe, Prisca Viehoever, Bernd Weisshaar, Volker KnoopAbstract:Plant mitochondrial genomes show much more evolutionary plasticity than those of animals. We analysed the first mitochondrial DNA (mtDNA) of a lycophyte, the quillwort Isoetes engelmannii, which is separated from seed plants by more than 350 million years of evolution. The Isoetes mtDNA is particularly rich in recombination events, and chloroplast as well as nuclear DNA inserts document the incorporation of foreign sequences already in this most ancestral vascular plant lineage. On the other hand, particularly small group II introns and short intergenic regions reveal a tendency of evolution towards a compact mitochondrial genome. RNA editing reaches extreme levels exceeding 100 pyrimidine exchanges in individual mRNAs and, hitherto unobserved in such frequency, also in tRNAs with 18C-to-U conversions in the tRNA for proline. In total, some 1500 sites of RNA editing can be expected for the Isoetes mitochondrial transcriptome. As a unique molecular novelty, the Isoetes cox1 gene requires trans-splicing via a discontinuous group I intron demonstrating disrupted, but functional, RNAs for yet another class of natural ribozymes.
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divergent intron conservation in the mitochondrial nad2 gene signatures for the three bryophyte classes mosses liverworts and hornworts and the lycophytes
Journal of Molecular Evolution, 2002Co-Authors: Dagmar Pruchner, Susanne Beckert, Hermann Muhle, Volker KnoopAbstract:The slow-evolving mitochondrial DNAs of plants have potentially conserved information on the phylogenetic branching of the earliest land plants. We present the nad2 gene structures in hornworts and liverworts and in the presumptive earliest-branching vascular land plant clade, the Lycopodiopsida. Taken together with the recently obtained nad2 data for mosses, each class of bryophytes presents another pattern of angiosperm-type introns conserved in nad2: intron nad2i1 in mosses; intron nad2i3 in liverworts; and both introns, nad2i3 and nad2i4, in hornworts. The lycopods Isoetes and Lycopodium show diverging intron conservation and feature a unique novel intron, termed nad2i3b. Hence, mitochondrial introns in general are positionally stable in the bryophytes and provide significant intraclade phylogenetic information, but the nad2 introns, in particular, cannot resolve the interclade relationships of the bryophyte classes and to the tracheophytes. The necessity for RNA editing to reconstitute conserved codon entities in nad2 is obvious for all clades except the marchantiid liverworts. Finally, we find that particularly small group II introns appear as a general feature of the Isoetes chondriome. Plant mitochondrial peculiarities such as RNA editing frequency, U-to-C type of RNA editing, and small group II introns appear to be genus-specific rather than gene-specific features.
Schafran, Peter W. - One of the best experts on this subject based on the ideXlab platform.
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Figure 4 from: Schafran PW, Leonard SW, Bray RD, Taylor WC, Musselman LJ (2016) Isoetes mississippiensis: A new quillwort from Mississippi, USA. PhytoKeys 74: 97-106. https://doi.org/10.3897/phytokeys.74.10380
2016Co-Authors: Schafran, Peter W., Bray, Rebecca D., Leonard, Steven W., Taylor W. Carl, Musselman, Lytton J.Abstract:Figure 4 - Map showing two localities of Isoetes mississippiensis. Inset: Map of Mississippi with detail area highlighted. Map created using ArcGIS software (Esri)
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Figure 3 from: Schafran PW, Leonard SW, Bray RD, Taylor WC, Musselman LJ (2016) Isoetes mississippiensis: A new quillwort from Mississippi, USA. PhytoKeys 74: 97-106. https://doi.org/10.3897/phytokeys.74.10380
2016Co-Authors: Schafran, Peter W., Bray, Rebecca D., Leonard, Steven W., Taylor W. Carl, Musselman, Lytton J.Abstract:Figure 3 - Light microscope image of megaspores of Isoetes mississippiensis from Schafran MS-07 (left) and MS-08 (right). Magnification 63×. Scale bar = 0.3 mm
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Figure 1 from: Schafran PW, Leonard SW, Bray RD, Taylor WC, Musselman LJ (2016) Isoetes mississippiensis: A new quillwort from Mississippi, USA. PhytoKeys 74: 97-106. https://doi.org/10.3897/phytokeys.74.10380
2016Co-Authors: Schafran, Peter W., Bray, Rebecca D., Leonard, Steven W., Taylor W. Carl, Musselman, Lytton J.Abstract:Figure 1 - SEMs of megaspores (a, b, c) and microspores (d, e, f) of Isoetes mississippiensis displaying distal (a, d), equatorial (b, e), and proximal (c, f) views. Megaspores from Schafran MS-08, microspores from Taylor 6798. Megaspore magnification 200×; microspore magnification 2000×
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Isoetes Mississippiensis: A New Quillwort from Mississippi, USA
ODU Digital Commons, 2016Co-Authors: Schafran, Peter W., Bray, Rebecca D., Leonard, Steven W., Taylor W. Carl, Musselman, Lytton JohnAbstract:Isoetes mississippiensis S.W. Leonard, W.C. Taylor, L.J. Musselman and R.D. Bray (Isoetaceae, Lycopodiophyta) is a new species known from two sites along tributaries of the Pearl River in southern Mississippi. This species is distinguished from other species in the southeastern United States by a combination of character states including a basic diploid (2n=22) chromosome count, laevigate megaspores, and a narrow velum covering less than one-third of the adaxial sporangium wall
Felix Grewe - One of the best experts on this subject based on the ideXlab platform.
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lycophyte plastid genomics extreme variation in gc gene and intron content and multiple inversions between a direct and inverted orientation of the rrna repeat
New Phytologist, 2019Co-Authors: Jeffrey P Mower, Felix Grewe, Alexander Taylor, Todd P Michael, Robert Vanburen, Yin-long QiuAbstract:Lycophytes are a key group for understanding vascular plant evolution. Lycophyte plastomes are highly distinct, indicating a dynamic evolutionary history, but detailed evaluation is hindered by the limited availability of sequences. Eight diverse plastomes were sequenced to assess variation in structure and functional content across lycophytes. Lycopodiaceae plastomes have remained largely unchanged compared with the common ancestor of land plants, whereas plastome evolution in Isoetes and especially Selaginella is highly dynamic. Selaginella plastomes have the highest GC content and fewest genes and introns of any photosynthetic land plant. Uniquely, the canonical inverted repeat was converted into a direct repeat (DR) via large-scale inversion in some Selaginella species. Ancestral reconstruction identified additional putative transitions between an inverted and DR orientation in Selaginella and Isoetes plastomes. A DR orientation does not disrupt the activity of copy-dependent repair to suppress substitution rates within repeats. Lycophyte plastomes include the most archaic examples among vascular plants and the most reconfigured among land plants. These evolutionary trends correlate with the mitochondrial genome, suggesting shared underlying mechanisms. Copy-dependent repair for DR-localized genes indicates that recombination and gene conversion are not inhibited by the DR orientation. Gene relocation in lycophyte plastomes occurs via overlapping inversions rather than transposase/recombinase-mediated processes.
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Additional file 2: Figure S1. of Reverse U-to-C editing exceeds C-to-U RNA editing in some ferns â a monilophyte-wide comparison of chloroplast and mitochondrial RNA editing suggests independent evolution of the two processes in both organelles
2016Co-Authors: Nils Knie, Felix Grewe, Simon Fischer, Volker KnoopAbstract:Comparison of mitochondrial RNA editing sites between monilophytes and lycophytes. The experimentally confirmed editing sites in the genes atp1 and nad5 of the monilophyte species Polypodium cambricum, Dicksonia antarctica and Azolla filiculoides are compared with the respective editing sites deposited in NCBI from the lycophytes Isoetes engelmannii and Selaginella moellendorffii. Only 16 edits are shared between all five taxa. Most of the edits from the two lycophytes are unique to either one species or are shared between the two lycophytes and are therefore most likely independent gains. For the basal lycophyte Phlegmariurus squarrosus only 14 edits (all of the C-to-U type) are found in our cDNA analysis. Three of these edits are shared between all three lycophytes and six between Phlegmariurus and Isoetes. (DOCX 127 kb
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A unique transcriptome: 1782 positions of RNA
2010Co-Authors: Felix Grewe, Bernd Weisshaar, Stefan Herres, Prisca Viehöver, Monika Polsakiewicz, Volker KnoopAbstract:editing alter 1406 codon identities in mitochondrial mRNAs of the lycophyte Isoetes engelmanni
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a trans splicing group i intron and trna hyperediting in the mitochondrial genome of the lycophyte Isoetes engelmannii
Nucleic Acids Research, 2009Co-Authors: Felix Grewe, Prisca Viehoever, Bernd Weisshaar, Volker KnoopAbstract:Plant mitochondrial genomes show much more evolutionary plasticity than those of animals. We analysed the first mitochondrial DNA (mtDNA) of a lycophyte, the quillwort Isoetes engelmannii, which is separated from seed plants by more than 350 million years of evolution. The Isoetes mtDNA is particularly rich in recombination events, and chloroplast as well as nuclear DNA inserts document the incorporation of foreign sequences already in this most ancestral vascular plant lineage. On the other hand, particularly small group II introns and short intergenic regions reveal a tendency of evolution towards a compact mitochondrial genome. RNA editing reaches extreme levels exceeding 100 pyrimidine exchanges in individual mRNAs and, hitherto unobserved in such frequency, also in tRNAs with 18C-to-U conversions in the tRNA for proline. In total, some 1500 sites of RNA editing can be expected for the Isoetes mitochondrial transcriptome. As a unique molecular novelty, the Isoetes cox1 gene requires trans-splicing via a discontinuous group I intron demonstrating disrupted, but functional, RNAs for yet another class of natural ribozymes.
Bray, Rebecca D. - One of the best experts on this subject based on the ideXlab platform.
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Figure 3 from: Schafran PW, Leonard SW, Bray RD, Taylor WC, Musselman LJ (2016) Isoetes mississippiensis: A new quillwort from Mississippi, USA. PhytoKeys 74: 97-106. https://doi.org/10.3897/phytokeys.74.10380
2016Co-Authors: Schafran, Peter W., Bray, Rebecca D., Leonard, Steven W., Taylor W. Carl, Musselman, Lytton J.Abstract:Figure 3 - Light microscope image of megaspores of Isoetes mississippiensis from Schafran MS-07 (left) and MS-08 (right). Magnification 63×. Scale bar = 0.3 mm
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Figure 4 from: Schafran PW, Leonard SW, Bray RD, Taylor WC, Musselman LJ (2016) Isoetes mississippiensis: A new quillwort from Mississippi, USA. PhytoKeys 74: 97-106. https://doi.org/10.3897/phytokeys.74.10380
2016Co-Authors: Schafran, Peter W., Bray, Rebecca D., Leonard, Steven W., Taylor W. Carl, Musselman, Lytton J.Abstract:Figure 4 - Map showing two localities of Isoetes mississippiensis. Inset: Map of Mississippi with detail area highlighted. Map created using ArcGIS software (Esri)
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Figure 1 from: Schafran PW, Leonard SW, Bray RD, Taylor WC, Musselman LJ (2016) Isoetes mississippiensis: A new quillwort from Mississippi, USA. PhytoKeys 74: 97-106. https://doi.org/10.3897/phytokeys.74.10380
2016Co-Authors: Schafran, Peter W., Bray, Rebecca D., Leonard, Steven W., Taylor W. Carl, Musselman, Lytton J.Abstract:Figure 1 - SEMs of megaspores (a, b, c) and microspores (d, e, f) of Isoetes mississippiensis displaying distal (a, d), equatorial (b, e), and proximal (c, f) views. Megaspores from Schafran MS-08, microspores from Taylor 6798. Megaspore magnification 200×; microspore magnification 2000×
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Isoetes Mississippiensis: A New Quillwort from Mississippi, USA
ODU Digital Commons, 2016Co-Authors: Schafran, Peter W., Bray, Rebecca D., Leonard, Steven W., Taylor W. Carl, Musselman, Lytton JohnAbstract:Isoetes mississippiensis S.W. Leonard, W.C. Taylor, L.J. Musselman and R.D. Bray (Isoetaceae, Lycopodiophyta) is a new species known from two sites along tributaries of the Pearl River in southern Mississippi. This species is distinguished from other species in the southeastern United States by a combination of character states including a basic diploid (2n=22) chromosome count, laevigate megaspores, and a narrow velum covering less than one-third of the adaxial sporangium wall
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A New Species of Diploid Quillwort (Isoetes, Isoetaceae, Lycophyta) from Lebanon
ODU Digital Commons, 2011Co-Authors: Bolin, Jay F., Bray, Rebecca D., Musselman, Lytton JohnAbstract:A new species, Isoetes libanotica Musselman, Bolin & B. D. Bray (Isoetaceae, Lycophyta), is described from Akkar District of northern Lebanon. It is a seasonal terrestrial species of basaltic soils, diploid (2n = 22), with complete velum coverage. Megaspore diameter ranges from 338 to 477 mu m with remote, low tuberculate ornamentation and a low to obsolete equatorial girdle; microspore length ranges from 25 to 30 mu m, with echinate ornamentation. At the type locality of I. libanotica, two other Isoetes L. species occur sympatrically. These superficially similar Isoetes species can be differentiated from I. libanotica using megaspore characters; I. duriei Bory has larger alveolate megaspores and I. olympica A. Braun has a prominent equatorial girdle
