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

Rodrigues, Ana Cláudia; Estelita, Maria Emília Maranhão

doi:10.1590/s0100-84042003000400003

Cited by 9 publications

(13 citation statements)

References 24 publications

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“…The number of external cortex cell layers in the roots and rhizomes of the studied species was higher than that of other amphibious species of Cyperaceae, such as Cyperus giganteus (Rodrigues and Estelita, 2003), and of Scrophulariaceae, such as Bacopa salzmanii and Bacopa monnierioides (Bona and Morretes, 2003) but in agreement with Pita and Menezes (2002), the exodermis is single and it is the limitary of external cortex, not having an exodermis plurisseriate. Hypoxia is responsible for the exodermis cell wall thickening (Enstone and Peterson, 2005), common in aquatic plants (Hose et al, 2001).…”

Section: Discussionsupporting

confidence: 89%

Structural variations among monocot emergent and amphibious species from lakes of the semi-arid region of Bahia, Brazil

2012

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Temporary lakes are common in the semi-arid region of the State of Bahia and form water mirrors in the rainy season. In this period, various vegetal species appear having different life forms adapted to the seasonality conditions of the rainfall regime. This work surveyed the adaptive anatomical structures of some emergent and amphibious monocot species occurring in these lakes. We studied the anatomy of roots, rhizomes, leaves and scapes of Cyperus odoratus, Oxycaryum cubense, Pycreus macrostachyos (Cyperaceae) -amphibious species; and of Echinodorus grandiflorus (Alismataceae), Eichhornia paniculata (Pontederiaceae) and Habenaria repens (Orchidaceae) -emergent species. The anatomical features of the dermal, fundamental and vascular systems confirming the tendency of the adaptive convergence of these plants to temporary lacustrine the environment include: single layered epidermal cells with a thin cuticle layer in the aerial organs; the presence of air canals in all the organs; few or no supporting tissues; and less numerous conducting elements and thinner cell walls in the xylem. The reduction of the supporting tissues, the number of stomata, which can even be absent, and the number of conducting elements and the degree of cell wall lignification in the xylem of the emergent species is more accentuated than that of the amphibious species. The pattern of distribution of aerenchyma in the roots of the studied species was considered important to distinguish between amphibious and emergent life forms.Keywords: anatomy, monocotyledons, vegetative organs, temporary lakes. Variação estrutural entre espécies anfíbias e emergentes de monocotiledôneas de lagoas do semiárido da Bahia, Brasil ResumoAs lagoas temporárias são comuns no semiárido baiano, apresentando espelhos de água no período chuvoso. Nesse período, surgem várias espécies vegetais com diferentes formas de vida, adaptadas às condições de sazonalidade do regime pluviométrico. Este trabalho objetivou levantar estruturas anatômicas adaptativas de algumas espécies de monocotiledôneas anfíbias e emergentes que ocorrem nessas lagoas. Para tanto, estudou-se anatomia de raiz, rizoma, folha e escapo de Cyperus odoratus, Oxycaryum cubense e Pycreus macrostachyos (Cyperaceae) -anfíbias, e de Echinodorus grandiflorus (Alismataceae), Eichhornia paniculata (Pontederiaceae) e Habenaria repens (Orchidaceae) -emergentes. Características anatômicas dos sistemas dérmico, fundamental e vascular -presença de uma camada de células epidérmicas, com cutícula fina nos órgãos aéreos; presença de lacunas de ar em todos os órgãos; baixa quantidade ou ausência de tecidos de sustentação; redução de elementos xilemáticos e do espessamento das paredes de suas células -confirmam uma tendência à convergência adaptativa dessas plantas ao ambiente lacustre temporário. As espécies emergentes, quando comparadas com as espécies anfíbias, apresentam essas características mais acentuadas, como redução no sistema de sustentação; redução na frequência e até ausência de estômatos, e redução d...

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Section: Discussionsupporting

confidence: 89%

Structural variations among monocot emergent and amphibious species from lakes of the semi-arid region of Bahia, Brazil

2012

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“…1). The occurrence of convoluted and contorted thylakoids has been related to the increase to the stromal area (Carolin et al 1977;Rodrigues & Estelita 2003).…”

Section: Discussionmentioning

confidence: 99%

“…However, in Cyperaceae it is difficult to establish patterns related to the chloroplast structure because of the small number of studied species, mainly in species C 4 of Rhynchospora and Eleocharis. The ultrastructural studies with C 4 Cyperaceae conducted in species from the four Kranz types have mainly examined species of tribe Cypereae (chlorocyperoid) and tribe Abildgaardieae (fimbristyloid) (Carolin et al 1977;Ueno et al 1988;Estelita 1992;Bruhl & Perry 1995;Rodrigues & Estelita 2003;Martins et al 2008). To Rhynchospora, presenting rhynchosporoid and chlorocyperoid Kranz types, some works described the ultrastructural features to Rhynchospora rubra (Lour.)…”

Section: Introductionmentioning

confidence: 99%

An Overview About Ultrastructure of Kranz Anatomy in Cyperaceae (Poales)

2015

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An overview about ultrastructure of Kranz anatomy in Cyperaceae (Poales) -The ultrastructure of the Kranz tissues in Cyperaceae species with the four types of Kranz anatomy (chlorocyperoid, eleocharoid, fimbristyloid and rhynchosporoid) was studied and compared with species already described in the literature, with the goal verifying the occurrence of patterns for the Kranz types. In addition, chloroplasts and mitochondria were quantified for the first time for all Kranz types. The chloroplast's structure is similar in the mesophyll cells (PCA) in the four Kranz types, but differs in some features in the bundle sheath cells (PCR). In the chlorocyperoid and rhynchosporoid types the bundle sheath cells (PCR) present centrifugal or scattered chloroplasts with convoluted or parallel thylakoids. In the eleocharoid types, the chloroplasts are scattered with parallel thylakoids. The fimbristyloid type presents centrifugal chloroplasts with convoluted and parallel thylakoids. To eleocharoid and fimbristyloid types and to Cyperus and Pycreus (chlorocyperoid) was observed pattern in the chloroplasts position. In most of the studied species the number of mitochondria in the bundle sheath cells (PCR) is significantly higher than in the mesophyll cells (PCA) and this result diverges from the results found in previous studies.

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

Cited by 9 publications

References 24 publications

Structural variations among monocot emergent and amphibious species from lakes of the semi-arid region of Bahia, Brazil

Structural variations among monocot emergent and amphibious species from lakes of the semi-arid region of Bahia, Brazil

An Overview About Ultrastructure of Kranz Anatomy in Cyperaceae (Poales)

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

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