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Karen S. Renzaglia – One of the best experts on this subject based on the ideXlab platform.

  • Structure and development of Nostoc strands in Leiosporoceros dussii (Anthocerotophyta): a novel symbiosis in land plants
    American Journal of Botany, 2006
    Co-Authors: A Juan Carlos Villarreal, Karen S. Renzaglia

    Abstract:

    The presence of Nostoc in longitudinally oriented schizogenous canals is a feature that separates Leiosporoceros from all other hornworts and represents a novel symbiotic arrangement in land plants. In surface view, Nostoc canals are visible as elongated, dichotomously branched blue-green strands. All other hornworts develop numerous discrete globose colonies through continuous production of mucilage clefts as avenues for multiple invasions within a single thallus. To elucidate the anatomy and development of the unusual Nostoc strands in Leiosporoceros, we examined sporeling development in culture and the structure of strands in field-collected plants using light and electron microscopy. Rosette-like sporelings have mucilage clefts scattered along swollen apices. All field specimens were strap-shaped, contained Nostoc, and lacked mucilage clefts. Nostoc strands are located in the center of the thallus and develop behind the apical cell by separation of the middle lamella between apical derivatives. Strands elongate and branch in synchrony with apical growth, and thus only a single invasion is required for strand production. Two distinct ultrastructural morphotypes in the collections suggest nonspecificity of Nostoc. We speculate that Nostoc enters the thallus in the sporeling stage through mucilage clefts, and once colonies are established, cleft production ceases.

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  • LEIOSPOROCEROS DUSSII (Anthocerotophyta): A NOVEL SYMBIOSIS IN LAND PLANTS 1
    , 2006
    Co-Authors: A Juan Carlos Villarreal, Karen S. Renzaglia

    Abstract:

    The presence of Nostoc in longitudinally oriented schizogenous canals is a feature that separates Leiosporoceros from all other hornworts and represents a novel symbiotic arrangement in land plants. In surface view, Nostoc canals are visible as elongated, dichotomously branched blue-green strands. All other hornworts develop numerous discrete globose colonies through continuous production of mucilage clefts as avenues for multiple invasions within a single thallus. To elucidate the anatomy and development of the unusual Nostoc strands in Leiosporoceros, we examined sporeling development in culture and the structure of strands in field-collected plants using light and electron microscopy. Rosette-like sporelings have mucilage clefts scattered along swollen apices. All field specimens were strap-shaped, contained Nostoc, and lacked mucilage clefts. Nostoc strands are located in the center of the thallus and develop behind the apical cell by separation of the middle lamella between apical derivatives. Strands elongate and branch in synchrony with apical growth, and thus only a single invasion is required for strand production. Two distinct ultrastructural morphotypes in the collections suggest nonspecificity of Nostoc. We speculate that Nostoc enters the thallus in the sporeling stage through mucilage clefts, and once colonies are established, cleft production ceases.

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  • the sporophyte gametophyte junction in the hornwort dendroceros tubercularis hatt Anthocerotophyta
    New Phytologist, 1990
    Co-Authors: R. Ligrone, Karen S. Renzaglia

    Abstract:

    SUMMARY The placenta of the anthocerote, Dendroceros tubercularis Hatt., consists of long and branched haustorial cells, that arise from the foot and gametophyte transfer cells. Both cell types contain electron-dense vacuolar deposits that were digested by pronase and therefore are assumed to be protein. These deposits were negative to the PATAg test for carbohydrates. Protein bodies were also found in the parenchyma cells of the foot and younger meristematic cells at the base of the capsule. Vacuolar deposits of osmiophilic material in the gametophyte cells external to the placenta were stained non-specifically with PATAg method and were not affected by pronase. The haustorial cells have pleomorphic plastids lacking starch and a thylakoid system, whereas the transfer cells have well developed chloroplasts. No pronase-sensitive material was detected in the apoplastic space separating gametophyte and sporophyte cells. These results suggest that protein is synthesized in the haustorial cells, perhaps from precursors provided by transfer cells, and is then transferred, via plasmodesmata, to the parenchyma cells of the foot and eventually to the cells of the growing capsule.

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R. Ligrone – One of the best experts on this subject based on the ideXlab platform.

  • the sporophyte gametophyte junction in the hornwort dendroceros tubercularis hatt Anthocerotophyta
    New Phytologist, 1990
    Co-Authors: R. Ligrone, Karen S. Renzaglia

    Abstract:

    SUMMARY The placenta of the anthocerote, Dendroceros tubercularis Hatt., consists of long and branched haustorial cells, that arise from the foot and gametophyte transfer cells. Both cell types contain electron-dense vacuolar deposits that were digested by pronase and therefore are assumed to be protein. These deposits were negative to the PATAg test for carbohydrates. Protein bodies were also found in the parenchyma cells of the foot and younger meristematic cells at the base of the capsule. Vacuolar deposits of osmiophilic material in the gametophyte cells external to the placenta were stained non-specifically with PATAg method and were not affected by pronase. The haustorial cells have pleomorphic plastids lacking starch and a thylakoid system, whereas the transfer cells have well developed chloroplasts. No pronase-sensitive material was detected in the apoplastic space separating gametophyte and sporophyte cells. These results suggest that protein is synthesized in the haustorial cells, perhaps from precursors provided by transfer cells, and is then transferred, via plasmodesmata, to the parenchyma cells of the foot and eventually to the cells of the growing capsule.

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  • The sporophyte–gametophyte junction in the hornwort, Dendroceros tubercularis Hatt (Anthocerotophyta)
    New Phytologist, 1990
    Co-Authors: R. Ligrone, Karen S. Renzaglia

    Abstract:

    SUMMARY The placenta of the anthocerote, Dendroceros tubercularis Hatt., consists of long and branched haustorial cells, that arise from the foot and gametophyte transfer cells. Both cell types contain electron-dense vacuolar deposits that were digested by pronase and therefore are assumed to be protein. These deposits were negative to the PATAg test for carbohydrates. Protein bodies were also found in the parenchyma cells of the foot and younger meristematic cells at the base of the capsule. Vacuolar deposits of osmiophilic material in the gametophyte cells external to the placenta were stained non-specifically with PATAg method and were not affected by pronase. The haustorial cells have pleomorphic plastids lacking starch and a thylakoid system, whereas the transfer cells have well developed chloroplasts. No pronase-sensitive material was detected in the apoplastic space separating gametophyte and sporophyte cells. These results suggest that protein is synthesized in the haustorial cells, perhaps from precursors provided by transfer cells, and is then transferred, via plasmodesmata, to the parenchyma cells of the foot and eventually to the cells of the growing capsule.

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Christine Cargill – One of the best experts on this subject based on the ideXlab platform.

  • Notes on Early Land Plants Today. 70. Nomenclatural notes in hornworts (Anthocerotophyta)
    Phytotaxa, 2015
    Co-Authors: Juan Carlos Villarreal, Christine Cargill, Lars Söderström, Anders Hagborg, Matt Von Konrat

    Abstract:

    Prior to the publication of the world checklist of hornworts and liverworts (Soderstrom et al ., in press) some taxa still need to be validated, transferred or synonymized. We are here dealing with the remaining nomenclatural issues among the Anthocerotophyta. Several taxa have not been typified properly and we are here suggesting several new lectotypes to stabilize the nomenclature.

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  • nuevos registros de antocerotes Anthocerotophyta rothm ex stotler crand stotler en cuba
    Ciencia en su PC, 2011
    Co-Authors: Yoira Riveraqueralta, Christine Cargill

    Abstract:

    Resumen es: Los antocerotes (Anthocerotophyta) son un grupo poco estudiado en Cuba, si se compara con el nivel de conocimiento que se tiene de los musgos y las hepat…

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  • nuevos registros de antocerotes Anthocerotophyta rothm
    , 2011
    Co-Authors: Yoira Riveraqueralta, Christine Cargill, Ex Stotler, Investigaciones Botanicas

    Abstract:

    The hornworts (Anthocerotophyta) are poorly studied in Cuba, compared to mosses and liverworts (Bryophyta and Marchantophyta). This study is based on the revision of herbarium material; literature consultation and the use of the optic and electronic microscopy of Scanning (JEOL LSM 6400 SEMs). After this study, the species: Anthoceros hispidus Steph. (Anthocerotaceae) and Phaeoceros oreganos (Aust.) Steph. (Notothyladaceae) were recognized and recorded for the first time in Cuba. Also, this study offered a characterization of them, photos and

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