Anatomia de raízes de Actinocephalus (Koern.) Sano (Eriocaulaceae)

Scatena, Vera Lúcia; Oriani, Aline; Sano, Paulo Takeo

doi:10.1590/s0102-33062005000400019

Cited by 9 publications

(5 citation statements)

References 13 publications

(26 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Com espécies brasileiras foram realizados trabalhos como o de Scatena & Menezes (1996) que descreveram a anatomia de espécies de Syngonanthus, Alquini & Morretes (1996) que analisaram as raízes de Musa rosaceae, Vianna et al (2001) que descreveram as raízes escoras de Philodendron bipinnatifidum (Araceae) e Pita & Menezes (2002) Govindarajalu (1974) e Sharma & Mehra (1972). As raízes adventícias das monocotiledôneas originam-se na sua maioria de um meristema periférico ao cilindro vascular denominado "meristema de espessamento primário" ou MEP (Rudall 1991, DeMason 1979.…”

Section: Introductionunclassified

Anatomia da raiz de Cyperus giganteus Vahl (Cyperaceae) em desenvolvimento

Rodrigues¹,

Estelita²

2004

Rev. bras. Bot.

View full text Add to dashboard Cite

-(Developmental root anatomy of Cyperus giganteus Vahl (Cyperaceae). Cyperus giganteus or "piri", constitutes a vegetable community denominated "Pirizal", in the Pantanal. It is considered an amphibious or mesophyte species, because it grows in ponds or dry soils. In the tip root there is the calyptrogen, from which the root cap originates; the promeristem, the protoderm, the procambium and the fundamental meristem are also evident in this part. During the differentiation of the protoderm and of the fundamental meristem from promeristem, the initial cell of both tissues can be observed. The external cortex is constituted by the hypodermis and the inner cortex is formed from the precursory layer of the endodermis. The endodermis presents Casparian strip, suberin lamella, thickened walls and phenolic compounds. In successive phases the inner cortex presents schizo-lysigenous aerenchyma. Precocious metaxylem elements are observed in the vascular cylinder followed by the protoxylem elements differentiation. During the development of the rhizome, the roots arise from the pericycle, that constitutes the innermost layer of the primary thickening meristem (PTM). The disposition of the aerenchyma, the multiple hypodermis and idioblasts with phenolic componds are the most representative characters in the root organization for the family Cyperaceae.Key words -Cyperaceae, Cyperus giganteus, root anatomy RESUMO -(Anatomia da raiz de Cyperus giganteus Vahl (Cyperaceae) em desenvolvimento). 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 elementos do metaxilema, seguida pela diferenciação dos elementos do floema. No rizoma, as raízes se originam do periciclo, o qual constitui a camada mais interna do meristema de espessamento primário (MEP). A raiz tem como caracteres representativos da família Cyperaceae a disposição do aerênquima, a hipoderme plurisseriada e idioblastos com compostos fenólicos.

show abstract

Section: Introductionunclassified

Anatomia da raiz de Cyperus giganteus Vahl (Cyperaceae) em desenvolvimento

Rodrigues¹,

Estelita²

2004

Rev. bras. Bot.

View full text Add to dashboard Cite

show abstract

“…Scale bars: 100 lm (13, 19, 21), 50 lm (14, 17, 18, 20, 22), 30 lm (14, 15, 23). E epidermis, H hypodermis, IS inner sheath, OS outer sheath, Arrows stomata; Arrow heads trichomes occur in the middle cortex, as it was observed in species of other genera such as Syngonanthus, Comanthera, Paepalanthus and Leiothrix (Stützel 1988;Scatena and Menezes 1996b;Coan et al 2002). In Eriocaulon and Paepalanthus macropodus, these arm cells are grouped forming diaphragms that transversally cross the air lacunae with the role of maintaining the integrity of the physical space in which the air is stored, facilitating gas exchange (Stützel 1988;Scatena and Moraes 1996;Scatena et al 1999b).…”

Section: Discussionmentioning

confidence: 72%

Anatomical characterization of vegetative organs and scapes of Rondonanthus (Eriocaulaceae, Poales)

Oliveira

Oriani

2016

Braz. J. Bot

Self Cite

View full text Add to dashboard Cite

Eriocaulaceae is a pantropical family and comprises ten genera. Rondonanthus is endemic to the north region of South America and comprises six species. The anatomy of roots, stem, leaves, and scapes were studied in four species to characterize the genus and to identify characteristics with taxonomic value. The following characteristics are diagnostic of Rondonanthus: roots-heterogeneous cortex with an aerenchyma supported by arm cells and vascular cylinder with a central metaxylem vessel element; stems-idioblasts with druses in the cortex and in the pith; leaves-Malpighian hairs, hypodermis in the adaxial surface, chlorenchyma with arm cells, druse idioblasts in the mesophyll, and vascular bundle sheath extensions with rounded cells; scapes-Malpighian hairs and chlorenchyma with arm cells. Rondonanthus capillaceus differed from the remaining studied species by presenting roots with a homogeneous cortex with thinwalled cells; filiform leaves without stomata and trichomes but with a chlorophyllous epidermis and a parenchymatous mesophyll and only one central vascular bundle without sheath extension. Such differences may be related to the habitat, since this species grows on river margins and requires hydrodynamic organs. The number of vascular bundles in the leaves is a useful characteristic to differentiate among species.

show abstract

“…At the roots, initially in meristematic regions, the endoderm can be recognized by having meristematic activity. At posterior stages, the endoderm consists of radially elongated cells, morphologically distinguished from the other layers, such as in Actinocephalus species studied by Scatena et al (2005). On A. trigynum rhizome, the endoderm can be recognized by having cell features that distinguish from the other cortical cells, such as cell shape and parietal thickening, such as observed in other Cyperaceae species (Eiten 1969;Estelita 1993;Chabbi et al 2000;Neves 2005 andPrata et al 2007).…”

Section: Discussionmentioning

confidence: 90%

Morphoanatomy of the underground system of Androtrichum trigynum (Cyperaceae)

Pereira

Rodrigues

2012

Rodriguésia

View full text Add to dashboard Cite

Androtrichum has only one species, A. trigynum (Spr.) Pfeiffer, occurring in coastal regions of the southwestern Atlantic coast. It presents an underground system consisting of rhizomes and adventitious roots. The rhizome is thickened, plagiotropic, sympodial, and floral scapes and roots arise from it. From the stem promeristem, the protoderm, procambium and ground meristem are differentiated. At the apex region, the intercalary meristem and primary thickening meristem (PTM) are observed. The adventitious roots originate from the PTM, and present root apex with closed organization. The young epidermis has papillose cells, and meristematic endoderm activity is observed. In a mature root, the outer cortex, or hypodermis, and the internal cortex can be identified. The endoderm presents radially elongated cells with thin walls and the pericycle is biseriate. The anatomical features observed in the present study are found in other species of Cyperaceae and some xeromorphic characters can be identified. Key-words: xeromorphic features, adventitious roots, rhizomes. ResumoAndrotrichum apresenta uma única espécie, A. trigynum (Spr.) Pfeiffer, ocorrendo em regiões litorâneas da costa sudoeste atlântica. Apresenta o sistema subterrâneo constituído por rizomas e raízes adventícias. O rizoma é espessado, plagiotrópico e simpodial, do qual partem os escapos florais e as raízes. A partir do promeristema caulinar diferenciam-se a protoderme, o procâmbio e o meristema fundamental. Na região apical observam--se os meristemas intercalar e de espessamento primário (MEP). As raízes adventícias se originam do MEP e apresentam o ápice radicular do tipo fechado. A epiderme jovem apresenta células papilosas. Observa-se também a endoderme meristemática em atividade. Na maturidade, identifica-se o córtex externo ou hipoderme e córtex interno diferenciado em aerênquima. A endoderme tem células alongadas no sentido radial com paredes finas e o periciclo é bisseriado. As características anatômicas observadas no presente estudo condizem com outras espécies de Cyperaceae, e caracteres xeromorfos podem ser identificados. Palavras-chave: caracteres xeromorfos, raízes adventícias, rizoma. Morphoanatomy of the underground system of Androtrichum trigynum (Cyperaceae)Morfoanatomia do sistema subterrâneo de Androtrichum trigynum (Cyperaceae)

show abstract

Anatomia de raízes de Actinocephalus (Koern.) Sano (Eriocaulaceae)

Cited by 9 publications

References 13 publications

Anatomia da raiz de Cyperus giganteus Vahl (Cyperaceae) em desenvolvimento

Anatomia da raiz de Cyperus giganteus Vahl (Cyperaceae) em desenvolvimento

Anatomical characterization of vegetative organs and scapes of Rondonanthus (Eriocaulaceae, Poales)

Morphoanatomy of the underground system of Androtrichum trigynum (Cyperaceae)

Contact Info

Product

Resources

About