Data/hora: 25/06/2024 13:58:17

Biblioteca(s): | Embrapa Mandioca e Fruticultura.
Data corrente: | 09/12/1999
Data da última atualização: | 17/04/2023
Autoria: | DUCKETT, J. G.; LIGRONE, R.
Afiliação: | School of Biological Sciences, Queen Mary and Westfield College, Mile End Road, London, E1 4NS, UK.
Título: | Plastid-dividing rings in ferns.
Ano de publicação: | 1993
Fonte/Imprenta: | Annals of Botany Company, n.72, p.619=627, 1993.
Idioma: | Inglês
Conteúdo: | Plastid-dividing rings (PDs) are described for the first time in the forns ophioglossum, Gleichenia, Hymenophyllum, Trichomanes. Athyritam, Dryopteris. ceratopteris and pteridium. They are found in the constricted isthmuses of undifferentiated plastids, amyloplasts and chloroplasts in gametopytes and in a range of sporophytic tissues including apices, differentiating leaf mesophyll and vascular parenchyma from roots,stems and leaves.Fern PDS comprise two concentric structures;a dense granular ring 60-100 nm wide adhering to the stromal face of the constriction and a smaller cytoplasmic annulus only 20-40 nm wide. The diameters of the PD-containing constrictions, particularly those in vascular parenchyma, where the outer component is usually lacking, are extremely uniform (means of 177-188nm in different species and tissues) and closely in line with those in angiosperms.
Palavras-Chave: | Chloroplast division; Division cycle; Ferns; Plastid-dividing rings; Pteridophytes.
Thesaurus Nal: | transmission electron microscopy.
Categoria do assunto: | --
Registro original: | Embrapa Mandioca e Fruticultura (CNPMF)
Exemplares: | CNPMF - (17492-1) - ADD - AP - DD - Publicação digital -  -  - DIS