Primary and secondary development of Cyperus giganteus Vahl rhizome (Cyperaceae)

Rodrigues, Ana Cláudia; Estelita, Maria Emília Maranhão

doi:10.1590/s0100-84042002000300001

Cited by 17 publications

(59 citation statements)

References 28 publications

(37 reference statements)

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“…O sistema subterrâneo é constituído por um rizoma plagiotrópico com entrenós contraídos, cujas gemas laterais dão origem a novas unidades simpodiais; ainda, estão presentes raízes adventícias relativamente delgadas e tenras (Rodrigues & Estelita 2002). …”

Section: Introductionunclassified

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

Rodrigues¹,

Estelita²

2004

Rev. bras. Bot.

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-(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.

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Section: Introductionunclassified

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

Rodrigues¹,

Estelita²

2004

Rev. bras. Bot.

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“…The plant possesses relatively thin, delicate, roots, borne on plagiotropic rhizomes (Rodrigues & Estelita 2002); the leaves are absent and, as a result, the scape is the principal photosynthetic organ. In the Pantanal region of Mato Grosso do Sul, western Brazil, C. giganteus is popularly known as "piri", and forms part of the family of plants known as "pirizal" (Allem & Valls 1987).…”

Section: Introductionmentioning

confidence: 99%

Origin and structure of the Kranz tissue in bracts of Cyperus giganteus Vahl (Cyperaceae)

Rodrigues¹,

Estelita²

2003

Rev. bras. Bot.

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-(Origin and structure of the Kranz tissue in bracts of Cyperus giganteus Vahl (Cyperaceae)). 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 mesophyll cells are relatively smaller, with thylakoids forming grana and a sparse peripheral reticulum. These ultrastructural characteristics show similarities to those of other species of the genus Cyperus.Key words -bracts, clorocyperoid, Cyperaceae, Cyperus giganteus, Kranz RESUMO -(Origem e estrutura do tecido Kranz em brácteas de Cyperus giganteus Vahl (Cyperaceae)). Cyperus giganteus apresenta estrutura Kranz do tipo clorociperoide, ou seja, com duas bainhas: uma interna, adjacente ao sistema vascular ou bainha Kranz, que contém muitas organelas, principalmente cloroplastos; e uma bainha externa, a bainha mestoma ou endoderme com células de paredes espessadas, lamela de suberina, e que apresenta estrias de Caspary perceptíveis em estágios jovens de diferenciação. As bainhas Kranz e mestoma originam-se do cordão procâmbial. Os cloroplastos das células Kranz são relativamente maiores, com tilacóides convolutos e retículo periférico conspícuo; os cloroplastos das células do mesofilo são relativamente menores, com tilacóides formando granos e retículo periférico inconspícuo. Estas características corroboram àquelas de outras espécies do gênero Cyperus.

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“…Casparian strips in the endodermis cells of young rhizomes of Cyperus laxus and Fimbristylis dichotoma were also observed, as well Fimbristylis dichotoma were also observed, as well Fimbristylis dichotoma as, in other Cyperaceae and monocotyledons (Eiten 1969, Bendixen 1973, Govindarajalu 1974, Wills et al 1980, Rodrigues and Estelita 2002, Alonso and Moraes-Dallaqua 2004, Menezes et al 2005, Lima and Menezes 2009. Some authors consider the occurrence of endodermis in rhizomes as the innermost layer of the cortex, even without fi nding the Casparian strips (Will et al 1980, Simão and Scatena 2001, Menezes et al 2005.…”

Section: Discussionmentioning

confidence: 93%

“…In general, studies on anatomical development are restricted to a description of only one organ, such as the roots in Cyperus giganteus (Rodrigues and Estelita 2004); rhizomes in Cyperus esculentus (Bendixen 1973), Cyperus giganteus (Rodrigues and Estelita 2002) and Scleria (Lima and Menezes 2009); and leaves in Cyperus eragrostis (Soros and Dengler 1996) and Cyperus giganteus (Rodrigues and Estelita 2003).…”

Section: Cyperus Laxus L (Non-kranz) and Fimbristylis Dichotomamentioning

confidence: 99%

Developmental anatomy of Cyperus laxus (non-Nranz) and Fimbristylis dichotoma (Kranz) (Cyperaceae, Poales) and tissue continuity

Martins

Scatena

2013

An. Acad. Bras. Ciênc.

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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 arrangement of mesophyll cells, which is regular in Cyperus laxus (non-Kranz) and arranged radially in Fimbristylis dichotoma (Kranz). Also differ in the number of bundles sheaths: two in Cyperus laxus (non-Kranz) and three in Fimbristylis dichotoma (Kranz). The outer bundle sheath in both species constitutes the endodermis, and the inner sheath in Cyperus laxus and the middle and inner sheaths in Fimbristylis dichotoma constitute the pericycle.

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Primary and secondary development of Cyperus giganteus Vahl rhizome (Cyperaceae)

Cited by 17 publications

References 28 publications

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

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

Origin and structure of the Kranz tissue in bracts of Cyperus giganteus Vahl (Cyperaceae)

Developmental anatomy of Cyperus laxus (non-Nranz) and Fimbristylis dichotoma (Kranz) (Cyperaceae, Poales) and tissue continuity

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