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| Rodrigues,Ana Claudia; Estelita,Maria Emília M.. |
| No Pantanal Cyperus giganteus ou "piri", constitui uma comunidade vegetal "Pirizal". É considerada espécie anfíbia ou mesófita, pois ocorre tanto em lagoas e/ou em solos secos. No ápice radicular são evidentes o caliptrogênio, que origina a coifa; o promeristema; a protoderme; o procâmbio e o meristema fundamental. A partir do promeristema identifica-se a célula que dá origem à protoderme e ao meristema fundamental. O córtex externo é constituído pela hipoderme; o córtex interno é formado a partir da camada precursora da endoderme, com formação do aerênquima esquizolisígeno. A endoderme apresenta estrias de Caspary, lamela de suberina, paredes espessadas e impregnada com compostos fenólicos. Observa-se no cilindro vascular a diferenciação precoce dos... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Anatomia; Cyperaceae; Cyperus giganteus; Raiz. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042004000400003 |
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| Rodrigues,Ana Claudia; Estelita,Maria Emília Maranhão. |
| Cyperus giganteus shows Kranz anatomy of the clorocyperoid type or with two sheaths, one internal, adjacent to the vascular system and known as Kranz sheath, with thin-walled cells and a large number of organelles, mainly chloroplasts; and an external sheath, the mestome sheath or endodermis, the cells of which present thickened walls, are without chloroplasts and possess a suberin lamella, together with the casparian strip which are detected in early stages of differentiation. The development of the vascular bundles shows the Kranz sheath originating from the procambial as well as the mestome sheath. The chloroplasts of the Kranz cells are relatively larger, with convoluted thylakoids and a prominent peripheral reticulum, while the chloroplasts of the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bracts; Clorocyperoid; Cyperaceae; Cyperus giganteus; Kranz. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042003000400003 |
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| RODRIGUES,ANA C.; ESTELITA,MARIA EMÍLIA M.. |
| In Cyperus giganteus, like in other Monocotyledoneae, the protoderm, procambium, fundamental meristem and primary thickening meristem (PTM) are differentiated from the rhizome promeristem. The PTM produces the inner cortical parenchyma, endodermis, pericycle and amphivasal vascular bundles, which are formed by the procambium too. After the primary body differentiates, cellular divisions continue only in the pericycle, and originate an irregular vascular system with vessel elements shorter and more branched than those found in the primary growth. This change of activity in the pericycle defines a secondary growth, where the secondary thickening meristem (STM) is the pericycle itself. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cyperus giganteus; Cyperaceae; Rhizome development; Secondary development. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042002000300001 |
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