Spore Wall Formation and Chloroplast Development During Sporogenesis in the Moss Fissidens limbatus

Mueller, Dale M. J.

doi:10.2307/2442023

Cited by 14 publications

(14 citation statements)

References 16 publications

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“…McClymont and Larson (1964) observed a separating layer in spore walls of each of the mosses they examined and they determined that this layer is not an artifact of the fixation process. A similar separating layer also has been identified recently in the spore wall of the moss Fissidens limbatus (Mueller, 1974). Whether or not this part of the wall represents the inner region of the exine as proposed by McClymont and Larson (1964) or the outer region of the intine as Mueller (1974) suggested is still unknown.…”

supporting

confidence: 59%

Ultrastructural Characteristics of Spore Germination in the Moss Dawsonia Superba

Stetler

DeMaggio

1976

American J of Botany

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The spore wall of Dawsonia superba has characteristics that, in many respects, are similar to those of other mosses except for the exine, which is layered in Dawsonia. Imbibed spores have a well-developed endoplasmic reticulum with dilated cisternae that are associated with vesicles at the periphery of the cell. Ribosomes on the surface of the vesicles suggest that many vesicles originate from the endoplasmic reticulum. Two types of protein storage bodies are observed: membrane bound protein bodies with a homogeneous matrix which gradually becomes vesicular, and densely stained and non-membrane bound bodies consisting of crystalline arrays of fibrils. As in spores of higher plants, the protein reserves disappear during germination and may be converted to starch and other materials needed for development of the gametophyte.

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supporting

confidence: 59%

Ultrastructural Characteristics of Spore Germination in the Moss Dawsonia Superba

Stetler

DeMaggio

1976

American J of Botany

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“…O esporoderma apresentou os três estratos mais freqüentes em musgos: perina, exina e intina e esta última camada foi perdida durante o processo de acetólise. Estes resultados comprovam as descrições de outros autores como Mueller (1974), Olensen & Mogensen (1978), Mogensen (1978Mogensen ( , 1981, Neidhart (1979), Brown & Lemmon (1984a, 1984b que analisaram a esporogênese de diferentes espécies de musgos e concluíram a presença dos três estratos acima citados na parede dos esporos.…”

Section: Discussionunclassified

Morfologia dos esporos de Sematophyllaceae Broth. ocorrentes em três fragmentos de Mata Atlântica, no Rio de Janeiro, Brasil

Caldeira

Esteves

Luizi-Ponzo³

2009

Rev. bras. Bot.

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-(Spores morphology from Sematophyllaceae Broth. from three fragments of Mata Atlântica, in Rio de Janeiro, Brazil). In the present work the spores of seven species of the family Sematophyllaceae Broth. (Bryophyta) from three areas of Mata Atlântica were analyzed. For the spores' external morphology analysis, the direct method in glycerined gelatin was used and for the measurements the method of acetolysis was used. The largest and smaller diameters (in polar view) and the thickness of the wall were measured. The analysis was carried under optical microscope and scanning electronic microscope. The spores are isomorphic, from small to medium size, heteropolars, of subcircular amb, with proximal apertural region and granulated surface. The apertural region is irregular. The variations found between the spores of the different species are related to the size of the spores and the distribution of the trimming elements.Key words -Bryophyta, Mata Atlântica, Sematophyllaceae, spores RESUMO -(Morfologia dos esporos de Sematophyllaceae Broth. ocorrentes em três fragmentos de Mata Atlântica, no Rio de Janeiro, Brasil). No presente trabalho foram analisados os esporos de sete espécies da família Sematophyllaceae Broth. (Bryophyta) ocorrentes em três áreas de Mata Atlântica. Para análise da morfologia externa dos esporos, utilizou-se o método direto em gelatina glicerinada e para as medidas foi utilizado o método de acetólise. Foram medidos os diâmetros maior e menor (em vista polar) e a espessura da parede. As análises foram realizadas sob microscópio de luz e microscópio eletrônico de varredura. Após a realização das medidas, realizou-se a análise estatística e estas foram apresentadas em tabelas. Os esporos são isomórficos, de tamanho pequeno a médio, heteropolares, de amb subcircular, com região apertural proximal e superfície granulada. A região apertural é irregular. As variações encontradas entre os esporos das diferentes espécies estão relacionadas ao tamanho dos esporos e à distribuição dos elementos de ornamentação.Palavras-chave -Bryophyta, esporos, Mata Atlântica, Sematophyllaceae

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“…Uehara & Kurita (1991), señalan que en Lycopodium los esporocitos se encuentran densamente empaquetados en el tejido esporógeno de la cavidad esporangial y se comunican entre sí por medio de la cubierta mencionada; a medida que maduran, la cubierta se disuelve permitiendo la liberación de los esporocitos premeióticos en el fluido de la cavidad esporangial. Esta condición también se observó en H. brevifolia y ha sido registrada para algunos briófitos (Mueller 1974). En Lycopodiella, en cambio, la cubierta original de los esporocitos persiste durante todo el proceso de esporogénesis, lo que podría sugerir que no es tan importante para el transporte de materiales precursores que formarán la pared de las esporas, y que existirían otros mecanismos de transporte entre el tapete y aquellas (Rincón Barón et al, en prep.).…”

Section: Discussionunclassified

“…En Lycopodiella, en cambio, la cubierta original de los esporocitos persiste durante todo el proceso de esporogénesis, lo que podría sugerir que no es tan importante para el transporte de materiales precursores que formarán la pared de las esporas, y que existirían otros mecanismos de transporte entre el tapete y aquellas (Rincón Barón et al, en prep.). Mueller (1974), observó que la degradación de la cubierta de los esporocitos en Fissidens limbatus Sullivant los prepara para la meiosis posterior y facilita el proceso de transporte entre el tapete y las esporas. Según Uehara & Kurita (1991) esto se cumple para L. clavatum.…”

Section: Discussionunclassified

Ontogenia del esporangio y esporogénesis del licopodio Huperzia brevifolia (Lycopodiaceae) de las altas montañas de Colombia

Barón

Landazábal

Ballesteros

et al. 2009

RBT

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Sporangia ontogeny and sporogenesis of the lycopodium Huperzia brevifolia (Lycopodiaceae) from the high mountains of Colombia. Huperzia brevifolia is one of the dominant species of the genus Huperzia living in paramos and superparamos from the Colombian Andes. A detailed study of the sporangium's ontogeny and sporogenesis was carried out using specimens collected at 4200m above sea level, in Parque Natural Nacional El Cocuy, Colombia. Small pieces of caulinar axis bearing sporangia were fixed, dehydrated, paraffin embedded, sectioned in a rotatory microtome, and stained using the common Safranin O-Fast Green technique; handmade cross sections were also made, stained with aqueous Toluidine Blue (TBO). The sporangia develops basipetally, a condition that allows observation of all the developmental stages taking place throughout the caulinar axis of adult plants. Each sporangium originates from a group of epidermal cells, axilar to the microphylls. These cells undergo active mitosis, and produce new external and internal cellular groups. The sporangium wall and the tapetum originate from the external group of cells, while the internal cellular group leads to the sporogenous tissue. Meiosis occur in the sporocytes and produce simultaneous types tetrads, each one giving rise four trilete spores, with foveolate ornamentation. During the sporangium ripening, the outermost layer of the wall develops anticlinally, and inner periclinal thickenings and the innermost one perform as a secretory tapetum, which persists until the spores are completely mature. All other cellular layers colapse. Rev. Biol. Trop. 57 (4): 1141-1152. Epub 2009 December 01.

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Spore Wall Formation and Chloroplast Development During Sporogenesis in the Moss Fissidens limbatus

Cited by 14 publications

References 16 publications

Ultrastructural Characteristics of Spore Germination in the Moss Dawsonia Superba

Ultrastructural Characteristics of Spore Germination in the Moss Dawsonia Superba

Morfologia dos esporos de Sematophyllaceae Broth. ocorrentes em três fragmentos de Mata Atlântica, no Rio de Janeiro, Brasil

Ontogenia del esporangio y esporogénesis del licopodio Huperzia brevifolia (Lycopodiaceae) de las altas montañas de Colombia

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