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Morbelli, Marta Alicia - One of the best experts on this subject based on the ideXlab platform.

  • Morfología y ultraestructura de las esporas de las Equisetaceae (Equisetopsida) del Noroeste de Argentina
    2020
    Co-Authors: Piñeiro, Maria Raquel, Morbelli, Marta Alicia
    Abstract:

    La familia Equisetaceae se haya representada en el Noroeste de Argentina por el género Equisetum Michx. ex DC con dos especies, E. bogotense Kunth y E. giganteum L. El estudio se realizó en base a material de herbario y fresco. Las observaciones se realizaron con microscopios óptico y electrónicos de barrido y transmisión. Las esporas son esferoidales, miden 35-64 µm de diámetro ecuatorial, su citoplasma posee clorofila. En ambas especies, las esporas presentan una estructura abertural circular y a ambos lados de la misma poseen un par de eláteres acintados de extremos espatulados, no resistentes al tratamiento de acetólisis. La esporodermis consta de dos paredes, perisporio, delgado, ornamentado, con dos estratos, de 930 nm-1,2 µm de espesor, y exosporio, de 1,4- 3,1 µm de espesor, compacto, con dos estratos y superficie levemente ondulada o plegada. Entre ambas paredes se ha observado una capa intermedia de naturaleza laxa, y diferente espesor en esporas con distintos estadios de maduración. Las esporas son similares, en ambas especies, en cuanto a la forma y ultraestructura de la esporodermis; se observan diferencias en el tamaño de las mismas.Spore morphology and wall ultrastructure in Equisetaceae spores (Equisetopsida) from north-western Argentina. The family Equisetaceae is represented in the study area by the genus Equisetum with two species, E. bogotense and E. giganteum. The study was based on herbarium and fresh specimens and the spores were studied under light microscope, scanning and transmission electron microscopes. The spores are spheroid, 35-64 µm in equatorial diameter, the cytoplasm has chlorophyll. In both species studied, the spores have a circular and small unique type of aperture which at both sides of the aperture, in the outer side have two thread-like elaters, spathulate. These structures are non-resistant to the acetolysis treatment. The sporoderm is composed of two walls, perispore, 930 nm-1,2 µm thick, ornamented, with two layers in section. The exospore is two layered, compact, 1,4-3,1 µm thick, slightly wave-like. Between both walls was observed an intermediate layer composed of a laxe structure, in spores in different stages of maturation. In both species, the spores are similar in the shape and sporoderm ultrastructure while differences were found in spore sizes.Facultad de Ciencias Naturales y Muse

  • Morfología y ultraestructura de las esporas de las Equisetaceae (Equisetopsida) del Noroeste de Argentina
    Sociedad Argentina de Botánica, 2014
    Co-Authors: Piñeiro, Maria Raquel, Morbelli, Marta Alicia
    Abstract:

    La familia Equisetaceae se haya representada en el Noroeste de Argentina por el género Equisetum Michx. ex DC con dos especies, E. bogotense Kunth y E. giganteum L. El estudio se realizó en base a material de herbario y fresco. Las observaciones se realizaron con microscopios óptico y electrónicos de barrido y transmisión. Las esporas son esferoidales, miden 35-64 µm de diámetro ecuatorial, su citoplasma posee clorofila. En ambas especies, las esporas presentan una estructura abertural circular y a ambos lados de la misma poseen un par de eláteres acintados de extremos espatulados, no resistentes al tratamiento de acetólisis. La esporodermis consta de dos paredes, perisporio, delgado, ornamentado, con dos estratos, de 930 nm-1,2 µm de espesor, y exosporio, de 1,4- 3,1 µm de espesor, compacto, con dos estratos y superficie levemente ondulada o plegada. Entre ambas paredes se ha observado una capa intermedia de naturaleza laxa, y diferente espesor en esporas con distintos estadios de maduración. Las esporas son similares, en ambas especies, en cuanto a la forma y ultraestructura de la esporodermis; se observan diferencias en el tamaño de las mismas.Spore morphology and wall ultrastructure in Equisetaceae spores (Equisetopsida) from north-western Argentina. The family Equisetaceae is represented in the study area by the genus Equisetum with two species, E. bogotense and E. giganteum. The study was based on herbarium and fresh specimens and the spores were studied under light microscope, scanning and transmission electron microscopes. The spores are spheroid, 35-64 µm in equatorial diameter, the cytoplasm has chlorophyll. In both species studied, the spores have a circular and small unique type of aperture which at both sides of the aperture, in the outer side have two thread-like elaters, spathulate. These structures are non-resistant to the acetolysis treatment. The sporoderm is composed of two walls, perispore, 930 nm-1,2 µm thick, ornamented, with two layers in section. The exospore is two layered, compact, 1,4-3,1 µm thick, slightly wave-like. Between both walls was observed an intermediate layer composed of a laxe structure, in spores in different stages of maturation. In both species, the spores are similar in the shape and sporoderm ultrastructure while differences were found in spore sizes.Fil: Piñeiro, Maria Raquel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Cátedra de Palinología; ArgentinaFil: Morbelli, Marta Alicia. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Cátedra de Palinología; Argentin

Chiharu Nakashima - One of the best experts on this subject based on the ideXlab platform.

  • Cercosporoid fungi (Mycosphaerellaceae) 3. Species on monocots (Poaceae, true grasses)
    IMA Fungus, 2015
    Co-Authors: Uwe Braun, Pedro W. Crous, Chiharu Nakashima
    Abstract:

    The third part of a series of monographic treatments of cercosporoid fungi (formerly Cercospora s. lat., Mycosphaerellaceae, Ascomycota) continues with a treatment of taxa on monocots (Liliopsida; Equisetopsida, Magnoliidae, Lilianae) , covering asexual and holomorph species with mycosphaerella-like sexual morphs on true grasses (Poaceae) , which were excluded from the second part. The species concerned are keyed out, alphabetically listed, described, illustrated and supplemented by references to previously published descriptions, illustrations, and exsiccatae. A key to the recognised genera and a discussion of taxonomically relevant characters was published in the first part of this series. Several species are lecto- or neotypified. The following taxonomic novelties are introduced: Cercospora barretoana comb, nov., C. cymbopogonicola nom. nov, Cladosporium elymi comb, nov., Passalora agrostidicola sp. nov., P. brachyelytri comb. nov., and P. dichanthii-annulati comb. nov.

  • Cercosporoid fungi (Mycosphaerellaceae) 2. Species on monocots (Acoraceae to Xyridaceae, excluding Poaceae)
    IMA Fungus, 2014
    Co-Authors: Uwe Braun, Pedro W. Crous, Chiharu Nakashima
    Abstract:

    Cercosporoid fungi (formerly Cercospora s. lat .) represent one of the largest groups of hyphomycetes belonging to the Mycosphaerellaceae (Ascomycota) . They include asexual morphs, asexual holomorphs, or species with mycosphaerella-like sexual morphs. Most of them are leaf-spotting plant pathogens with special phytopathological relevance. In the first part of a new monographic work, cercosporoid hyphomycetes occurring on other fungi (fungicolous species), on ferns (pteridophytes) and gymnosperms were treated. This second part deals with cercosporoid fungi on monocots (Liliopsida; Equisetopsida, Magnoliidae, Lilianae) , which covers species occurring on host plants belonging to families arranged in alphabetical order from Acoraceae to Xyridaceae , excluding Poaceae (cereals and grasses) which requires a separate treatment. The species are described and illustrated in alphabetical order under the particular cercosporoid genera, supplemented by keys to the species concerned. A detailed introduction, a survey of currently recognised cercosporoid genera, a key to the genera concerned, and a discussion of taxonomically relevant characters were published in the first part of this series. Neopseudocercospora , an additional recently introduced cercosporoid genus, is briefly discussed. The following taxonomic novelties are introduced: Cercospora alpiniigena sp. nov., C. neomaricae sp. nov, Corynespora palmicola comb. nov, Exosporium miyakei comb. nov, E. petersii comb. nov., Neopseudocercospora zambiensis comb. nov., Passalora caladiicola comb. nov, P. streptopi comb. nov., P. togashiana comb. nov., P. tranzschelii var. chinensis var. nov, Pseudocercospora beaucarneae comb. nov, P. constrictoflexuosa comb. et stat. nov, P. curcumicola sp. nov, P. dispori comb. nov., P. smilacicola sp. nov, P. urariigena nom. nov, Zasmidium agavicola comb. nov, Z. cercestidis-afzelii comb. nov, Z. citri-griseum comb. nov., Z. cyrtopodii comb. nov, Z gahnae comb. nov, Z. indicum comb. nov., Z liriopes comb. nov., Z mycovellosielloides sp. nov, Z. scleriae comb. nov, Z. smilacicola comb. nov, and Z. thaliae comb. nov.

Piñeiro, Maria Raquel - One of the best experts on this subject based on the ideXlab platform.

  • Morfología y ultraestructura de las esporas de las Equisetaceae (Equisetopsida) del Noroeste de Argentina
    2020
    Co-Authors: Piñeiro, Maria Raquel, Morbelli, Marta Alicia
    Abstract:

    La familia Equisetaceae se haya representada en el Noroeste de Argentina por el género Equisetum Michx. ex DC con dos especies, E. bogotense Kunth y E. giganteum L. El estudio se realizó en base a material de herbario y fresco. Las observaciones se realizaron con microscopios óptico y electrónicos de barrido y transmisión. Las esporas son esferoidales, miden 35-64 µm de diámetro ecuatorial, su citoplasma posee clorofila. En ambas especies, las esporas presentan una estructura abertural circular y a ambos lados de la misma poseen un par de eláteres acintados de extremos espatulados, no resistentes al tratamiento de acetólisis. La esporodermis consta de dos paredes, perisporio, delgado, ornamentado, con dos estratos, de 930 nm-1,2 µm de espesor, y exosporio, de 1,4- 3,1 µm de espesor, compacto, con dos estratos y superficie levemente ondulada o plegada. Entre ambas paredes se ha observado una capa intermedia de naturaleza laxa, y diferente espesor en esporas con distintos estadios de maduración. Las esporas son similares, en ambas especies, en cuanto a la forma y ultraestructura de la esporodermis; se observan diferencias en el tamaño de las mismas.Spore morphology and wall ultrastructure in Equisetaceae spores (Equisetopsida) from north-western Argentina. The family Equisetaceae is represented in the study area by the genus Equisetum with two species, E. bogotense and E. giganteum. The study was based on herbarium and fresh specimens and the spores were studied under light microscope, scanning and transmission electron microscopes. The spores are spheroid, 35-64 µm in equatorial diameter, the cytoplasm has chlorophyll. In both species studied, the spores have a circular and small unique type of aperture which at both sides of the aperture, in the outer side have two thread-like elaters, spathulate. These structures are non-resistant to the acetolysis treatment. The sporoderm is composed of two walls, perispore, 930 nm-1,2 µm thick, ornamented, with two layers in section. The exospore is two layered, compact, 1,4-3,1 µm thick, slightly wave-like. Between both walls was observed an intermediate layer composed of a laxe structure, in spores in different stages of maturation. In both species, the spores are similar in the shape and sporoderm ultrastructure while differences were found in spore sizes.Facultad de Ciencias Naturales y Muse

  • Morfología y ultraestructura de las esporas de las Equisetaceae (Equisetopsida) del Noroeste de Argentina
    Sociedad Argentina de Botánica, 2014
    Co-Authors: Piñeiro, Maria Raquel, Morbelli, Marta Alicia
    Abstract:

    La familia Equisetaceae se haya representada en el Noroeste de Argentina por el género Equisetum Michx. ex DC con dos especies, E. bogotense Kunth y E. giganteum L. El estudio se realizó en base a material de herbario y fresco. Las observaciones se realizaron con microscopios óptico y electrónicos de barrido y transmisión. Las esporas son esferoidales, miden 35-64 µm de diámetro ecuatorial, su citoplasma posee clorofila. En ambas especies, las esporas presentan una estructura abertural circular y a ambos lados de la misma poseen un par de eláteres acintados de extremos espatulados, no resistentes al tratamiento de acetólisis. La esporodermis consta de dos paredes, perisporio, delgado, ornamentado, con dos estratos, de 930 nm-1,2 µm de espesor, y exosporio, de 1,4- 3,1 µm de espesor, compacto, con dos estratos y superficie levemente ondulada o plegada. Entre ambas paredes se ha observado una capa intermedia de naturaleza laxa, y diferente espesor en esporas con distintos estadios de maduración. Las esporas son similares, en ambas especies, en cuanto a la forma y ultraestructura de la esporodermis; se observan diferencias en el tamaño de las mismas.Spore morphology and wall ultrastructure in Equisetaceae spores (Equisetopsida) from north-western Argentina. The family Equisetaceae is represented in the study area by the genus Equisetum with two species, E. bogotense and E. giganteum. The study was based on herbarium and fresh specimens and the spores were studied under light microscope, scanning and transmission electron microscopes. The spores are spheroid, 35-64 µm in equatorial diameter, the cytoplasm has chlorophyll. In both species studied, the spores have a circular and small unique type of aperture which at both sides of the aperture, in the outer side have two thread-like elaters, spathulate. These structures are non-resistant to the acetolysis treatment. The sporoderm is composed of two walls, perispore, 930 nm-1,2 µm thick, ornamented, with two layers in section. The exospore is two layered, compact, 1,4-3,1 µm thick, slightly wave-like. Between both walls was observed an intermediate layer composed of a laxe structure, in spores in different stages of maturation. In both species, the spores are similar in the shape and sporoderm ultrastructure while differences were found in spore sizes.Fil: Piñeiro, Maria Raquel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Cátedra de Palinología; ArgentinaFil: Morbelli, Marta Alicia. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Cátedra de Palinología; Argentin

Uwe Braun - One of the best experts on this subject based on the ideXlab platform.

  • Cercosporoid fungi (Mycosphaerellaceae) 3. Species on monocots (Poaceae, true grasses)
    IMA Fungus, 2015
    Co-Authors: Uwe Braun, Pedro W. Crous, Chiharu Nakashima
    Abstract:

    The third part of a series of monographic treatments of cercosporoid fungi (formerly Cercospora s. lat., Mycosphaerellaceae, Ascomycota) continues with a treatment of taxa on monocots (Liliopsida; Equisetopsida, Magnoliidae, Lilianae) , covering asexual and holomorph species with mycosphaerella-like sexual morphs on true grasses (Poaceae) , which were excluded from the second part. The species concerned are keyed out, alphabetically listed, described, illustrated and supplemented by references to previously published descriptions, illustrations, and exsiccatae. A key to the recognised genera and a discussion of taxonomically relevant characters was published in the first part of this series. Several species are lecto- or neotypified. The following taxonomic novelties are introduced: Cercospora barretoana comb, nov., C. cymbopogonicola nom. nov, Cladosporium elymi comb, nov., Passalora agrostidicola sp. nov., P. brachyelytri comb. nov., and P. dichanthii-annulati comb. nov.

  • Cercosporoid fungi (Mycosphaerellaceae) 2. Species on monocots (Acoraceae to Xyridaceae, excluding Poaceae)
    IMA Fungus, 2014
    Co-Authors: Uwe Braun, Pedro W. Crous, Chiharu Nakashima
    Abstract:

    Cercosporoid fungi (formerly Cercospora s. lat .) represent one of the largest groups of hyphomycetes belonging to the Mycosphaerellaceae (Ascomycota) . They include asexual morphs, asexual holomorphs, or species with mycosphaerella-like sexual morphs. Most of them are leaf-spotting plant pathogens with special phytopathological relevance. In the first part of a new monographic work, cercosporoid hyphomycetes occurring on other fungi (fungicolous species), on ferns (pteridophytes) and gymnosperms were treated. This second part deals with cercosporoid fungi on monocots (Liliopsida; Equisetopsida, Magnoliidae, Lilianae) , which covers species occurring on host plants belonging to families arranged in alphabetical order from Acoraceae to Xyridaceae , excluding Poaceae (cereals and grasses) which requires a separate treatment. The species are described and illustrated in alphabetical order under the particular cercosporoid genera, supplemented by keys to the species concerned. A detailed introduction, a survey of currently recognised cercosporoid genera, a key to the genera concerned, and a discussion of taxonomically relevant characters were published in the first part of this series. Neopseudocercospora , an additional recently introduced cercosporoid genus, is briefly discussed. The following taxonomic novelties are introduced: Cercospora alpiniigena sp. nov., C. neomaricae sp. nov, Corynespora palmicola comb. nov, Exosporium miyakei comb. nov, E. petersii comb. nov., Neopseudocercospora zambiensis comb. nov., Passalora caladiicola comb. nov, P. streptopi comb. nov., P. togashiana comb. nov., P. tranzschelii var. chinensis var. nov, Pseudocercospora beaucarneae comb. nov, P. constrictoflexuosa comb. et stat. nov, P. curcumicola sp. nov, P. dispori comb. nov., P. smilacicola sp. nov, P. urariigena nom. nov, Zasmidium agavicola comb. nov, Z. cercestidis-afzelii comb. nov, Z. citri-griseum comb. nov., Z. cyrtopodii comb. nov, Z gahnae comb. nov, Z. indicum comb. nov., Z liriopes comb. nov., Z mycovellosielloides sp. nov, Z. scleriae comb. nov, Z. smilacicola comb. nov, and Z. thaliae comb. nov.

Shaojun Dai - One of the best experts on this subject based on the ideXlab platform.

  • cytological and proteomic analyses of horsetail equisetum arvense l spore germination
    Frontiers in Plant Science, 2015
    Co-Authors: Qi Zhao, Jing Gao, Jinwei Suo, Sixue Chen, Tai Wang, Shaojun Dai
    Abstract:

    Spermatophyte pollen tubes and root hairs have been used as single-cell-type model systems to understand the molecular processes underlying polar growth of plant cells. Horsetail (Equisetum arvense L.) is a perennial herb species in Equisetopsida, which creates separately growing spring and summer stems in its life cycle. The mature chlorophyllous spores produced from spring stems can germinate without dormancy. Here we report the cellular features and protein expression patterns in five stages of horsetail spore germination (mature spores, rehydrated spores, double-celled spores, germinated spores, and spores with protonemal cells). Using 2-DE combined with mass spectrometry, 80 proteins were found to be abundance changed upon spore germination. Among them, proteins involved in photosynthesis, protein turnover, and energy supply were over-represented. Thirteen proteins appeared as proteoforms on the gels, indicating the potential importance of post-translational modification. In addition, the dynamic changes of ascorbate peroxidase, peroxiredoxin, and dehydroascorbate reductase implied that reactive oxygen species homeostasis is critical in regulating cell division and tip-growth. The time course of germination and diverse expression patterns of proteins in photosynthesis, energy supply, lipid and amino acid metabolism indicated that heterotrophic and autotrophic metabolism were necessary in light-dependent germination of the spores. Twenty-six proteins were involved in protein synthesis, folding, and degradation, indicating that protein turnover is vital to spore germination and rhizoid tip-growth. Furthermore, the altered abundance of 14-3-3 protein, small G protein Ran, actin, and caffeoyl-CoA O-methyltransferase revealed that signaling transduction, vesicle trafficking, cytoskeleton dynamics, and cell wall modulation were critical to cell division and polar growth. These findings lay a foundation toward understanding the molecular mechanisms underlying fern spore asymmetric division and rhizoid polar growth.