Consulta: subjectFacets:"Pericycle"
Registros recuperados: 3
Data/hora: 02/06/2024 04:31:02

Primary and secondary thickening in the stem of Cordyline fruticosa (Agavaceae)
Provedor de dados: Anais da Academia Brasileira de Ciências
Autores: Cattai,Marina B.; Menezes,Nanuza L. de.
The growth in thickness of monocotyledon stems can be either primary, or primary and secondary. Most of the authors consider this thickening as a result of the PTM (Primary Thickening Meristem) and the STM (Secondary Thickening Meristem) activity. There are differences in the interpretation of which meristem would be responsible for primary thickening. In Cordyline fruticosa the procambium forms two types of vascular bundles: collateral leaf traces (with proto and metaxylem and proto and metaphloem), and concentric cauline bundles (with metaxylem and metaphloem). The procambium also forms the pericycle, the outermost layer of the vascular cylinder consisting of smaller and less intensely colored cells that are divided irregularly to form new vascular...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pericycle; Collateral leaf traces; Concentric cauline bundles.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000300013

Developmental anatomy of Cyperus laxus (non-Nranz) and Fimbristylis dichotoma (Kranz) (Cyperaceae, Poales) and tissue continuity
Provedor de dados: Anais da Academia Brasileira de Ciências
Autores: MARTINS,SHIRLEY; SCATENA,VERA L.
The Cyperaceae species are present in different ecosystems and constitute the herbaceous extract. Of the approximately 5,500 species of the family; a third has Kranz anatomy, representing an important characteristic of the taxonomy and phylogeny of the group. In Cyperus laxus L. (non-Kranz) and Fimbristylis dichotoma Vahl (Kranz), development begins with germination that is marked by the emergence of the coleoptiles, followed by the primary root, which is ephemeral. The rhizome originates from the mesocotyl and it promotes the vascular connection between the roots, leaves and scapes. The continuity of the tissues is evidenced by the presence of an endodermis and pericycle in all vegetative organs. Leaves and scapes differ between the two species by the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pericycle; Endodermis; Casparian strips; Seedling.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200605

Meristematic activity of the Endodermis and the Pericycle in the primary thickening in monocotyledons: considerations on the "PTM"
Provedor de dados: Anais da Academia Brasileira de Ciências
Autores: Menezes,Nanuza L. de; Silva,Delmira C.; Arruda,Rosani C.O.; Melo-de-Pinna,Gladys F.; Cardoso,Vanessa A.; Castro,Neuza M.; Scatena,Vera L.; Scremin-Dias,Edna.
This paper proposes a new interpretation for primary thickening in monocotyledons. The anatomy of the vegetative organs of the following species was examined: Cephalostemon riedelianus (Rapataceae), Cyperus papyrus (Cyperaceae), Lagenocarpus rigidus, L. junciformis (Cyperaceae), Echinodorus paniculatus (Alismataceae) and Zingiber officinale (Zingiberaceae). The endodermis with meristematic activity was observed in the root of all the species, in the stem of Cyperus, Cephalostemum and Lagenocarpus rigidus, and in the leaf trace of Cyperus and leaf of Echinodorus. Considering the continuity of tissues through the root, stem and leaf, the authors conclude that in the stem the pericycle remains active throughout the life of the plant as the generator of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cephalostemon; Cyperus; Echinodorus; Lagenocarpus; Zingiber; Meristematic endodermis; Pericycle; Primary thickening.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000200006