Consulta: subjectFacets:"Bordered pit"
Registros recuperados: 2
Data/hora: 17/06/2024 01:13:55

The phylogenetic significance of vestured pits in Boraginaceae
Provedor de dados: 16
Autores: Rabaey, D.; Lens, F.; Smets, E.; Jansen, S.
The bordered pit structure in tracheary elements of 105 Boraginaceae species is studied using scanning electron microscopy to examine the systematic distribution of vestured pits. Forty-three species out of 16 genera show a uniform presence of this feature throughout their secondary xylem. Most vestures are small, unbranched and associated with the outer pit aperture of bordered intervessel pits. The feature is likely to have originated independently in the distantly related subfamilies Boraginoideae (tribe Lithospermeae) and Ehretioideae. The distribution of vestures in Ehretia agrees with recent molecular phylogenies: (1) species with vestured pits characterise the Ehretia I group (incl. Rotula), and (2) species with non-vestured pits belong to the...
Tipo: Article / Letter to the editor
Palavras-chave: Boraginaceae; Boraginoideae; Bordered pit; Ehretioideae; Scanning electron microscopy; Vestures; 42.56.
Ano: 2010
URL: http://www.repository.naturalis.nl/record/430079

A comparative ultrastructural study of pit membranes with plasmodesmata associated thickenings in four angiosperm species
Provedor de dados: 16
Autores: Rabaey, D.; Lens, F.; Huysmans, S.; Smets, E.; Jansen, S.
Recent micromorphological observations of angiosperm pit membranes have extended the number and range of taxa with pseudo-tori in tracheary elements. This study investigates at ultrastructural level (TEM) the development of pseudo-tori in the unrelated Malus yunnanensis, Ligustrum vulgare, Pittosporum tenuifolium, and Vaccinium myrtillus in order to determine whether these plasmodesmata associated thickenings have a similar developmental pattern across flowering plants. At early ontogenetic stages, the formation of a primary thickening was observed, resulting from swelling of the pit membrane in fibre-tracheids and vesselelements. Since plasmodesmata appear to be frequently, but not always, associated with these primary pit membrane thickenings, it remains...
Tipo: Article / Letter to the editor
Palavras-chave: Ontogeny; Pseudo-torus; Tracheary element; Pit membrane; Bordered pit; Wood ultrastructure; 42.56.
Ano: 2008
URL: http://www.repository.naturalis.nl/record/430078