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dc.contributor.author
Morbelli, Marta Alicia
dc.contributor.author
Rowley, John R.
dc.date.available
2024-08-27T11:28:42Z
dc.date.issued
2010-09
dc.identifier.citation
Morbelli, Marta Alicia; Rowley, John R.; Structure of wall layers in Selaginella kraussiana microspores (Lycophyta); Taylor & Francis As; Grana; 49; 3; 9-2010; 194-203
dc.identifier.issn
0017-3134
dc.identifier.uri
http://hdl.handle.net/11336/243169
dc.description.abstract
A similarity was found in both construction and ultrastructure between the two exospore layers in microspores of Selaginella kraussiana. The exospore is made up of two different kinds of rods. One of the kinds of rods are large, 100–150 nm in width, while the other are tubular rods 10–15 nm in diameter. The large rods are wider at the base of the spines than in the upper part, possibly due to flattening or compression. Both the outer and the inner exospores have a stranded surface that is very pronounced in the microspores of this species. Fibrous strands persisting the scanning electron microscope and transmission electron microscope (TEM) fixations were observed on the spore surface proximally and through perforations (exospore channel openings). This net of fibres penetrates and fills the space of the cavities within large channels through the outer and inner exospore and within the gap. According to our interpretation, these strands would be produced by the tapetum and are probably related to the nourishment of the developing microspores. Contrast varies in TEM sections after cytochemical stains, but this appears to be due to transitory substances, e.g. carbohydrates, rather than to be a substantial difference in basic composition between inner and outer exospore layers.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Taylor & Francis As
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Selaginella
dc.subject
microspore,
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exospore,
dc.subject
structure
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gap,
dc.subject
rods
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channels
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fibres
dc.subject.classification
Ciencias de las Plantas, Botánica
dc.subject.classification
Ciencias Biológicas
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Structure of wall layers in Selaginella kraussiana microspores (Lycophyta)
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2024-08-21T13:00:06Z
dc.journal.volume
49
dc.journal.number
3
dc.journal.pagination
194-203
dc.journal.pais
Reino Unido
dc.journal.ciudad
Londres
dc.description.fil
Fil: Morbelli, Marta Alicia. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina
dc.description.fil
Fil: Rowley, John R.. Stockholm University Of The Arts (uniarts);
dc.journal.title
Grana
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.tandfonline.com/doi/full/10.1080/00173134.2010.484231
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1080/00173134.2010.484231
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