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Complex sporoderm structure in bryophyte spores: a palynological study of Erpodiaceae Broth. Acta Botanica
Luizi-Ponzo,Andrea Pereira; Silva-e-Costa,Juliana da Costa.
ABSTRACT Palynological studies of bryophytes are critical for evaluating the taxonomic relevance of their spores. They also provide important support to paleoecological investigations that, usually, treat bryophytes as a whole, which does not permit the evaluation of specific functional traits of a special taxonomic unit. The present study investigated the morphology and ultrastructure of spores of five species of Erpodiaceae (Bryophyta), and assessed the implications for taxonomy and the recognition of spores of past records. Erpodiaceae includes corticolous and saxicolous plants that are widely distributed throughout tropical and temperate regions. The spores were found to be isomorphic and apolar with a subcircular amb, granulate, inaperturate. The...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bryophytes; Mosses; Palynology; Spore; Sporoderm; Ultrastructure.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062019000100141
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Distribution of pectins in the pollen apertures of Oenothera hookeri.velans ster/+ster: Biocell
Noher de Halac,I.; Cismondi,I.A.; Rodriguez-Garcia,M.I.; Famá,G..
Cell wall pectins are some of the most complex biopolymers known, and yet their functions remain largely mysterious. The aim of this paper was to deepen the study of the spatial pattern of pectin distribution in the aperture of Oenothera hookeri.velans ster/+ster fertile pollen. We used "in situ" immunocytochemical techniques at electron microscopy, involving monoclonal antibodies JIM5 and JIM7 directed against pectin epitopes in fertile pollen grains of Oenothera hookeri.velans ster/+ster. The same region was also analyzed by classical cytochemistry for polysaccharide detection. Immunogold labelling at the JIM7 epitope showed only in mature pollen labelling mainly located at the intine endo-aperture region. Cytoplasmic structures near the plasma membrane...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Pectins; Monoclonal antibodies; JIM5; JIM7; Immunogold; Pollen; Sporoderm; Oenothera; Cytochemistry.
Ano: 2003 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452003000100002
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Palynological analysis of Dennstaedtiaceae taxa from the Paranaense Phytogeografic Province that produce monolete spores and its systematic implications (I): Blotiella lindeniana , Histiopteris incisa and Paesia glandulosa Anais da ABC (AABC)
YAÑEZ,AGUSTINA; MARQUEZ,GONZALO J.; MORBELLI,MARTA A..
ABSTRACT The genera of Dennstaedtiaceae have sporophytes with very different morphological characteristics between each other, and this feature has made difficult the systematic circumscription of the family. This reason makes necessary the study of new characters that allow a better understanding of the relations within the group. The spore morphology and wall structure of Blotiella lindeniana, Histiopteris incisa and Paesia glandulosa from the Paranaense Phytogeographic Province were studied using light microscope, and scanning and transmission electron microscope. The exospore has two layers and, according to the species, the exospore surface bears pila, echinae, verrucae, bacula and tubercles. The perispore has two or three layers and its surface is...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ferns; Morphology; South America; Sporoderm; Ultrastructure.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000602731
Registros recuperados: 3
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