Epidermal Silica Cells in the Cyperaceae

Mehra, P. N.; Sharma, O. P.

doi:10.1086/336295

Cited by 36 publications

(19 citation statements)

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“…Th e vast majority of works, including the comprehensive article by Metcalfe (1971), cite only "silica cells", oft en without conducting any specifi c test, such as that of Mehra & Sharma (1965) that analyzed "silica cells", in thirteen genera of Cyperaceae in India, and Kukkonen (1967). Th ese authors used the number of cells with conical projections, and other characters, to separate Uncinia species.…”

Section: Resultsmentioning

confidence: 99%

Silicon location through backscattered electron imaging and X-ray microanalysis in leaves of Cyperus ligularis L. and Rhynchospora aberrans C. B. Clarke (Cyperaceae)

Estelita

Rodrigues

2012

Acta Bot. Bras.

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Silicon location through backscattered electron imaging and X-ray microanalysis in leaves of Cyperus ligularis L. and Rhynchospora aberrans C. B. Clarke (Cyperaceae) RESUMO (Localização de sílica por elétrons retroespalhados em folhas de Cyperus ligularis L. and Rhynchospora aberrans C. B. Clarke (Cyperaceae)). As Cyperaceae têm a capacidade de incorporação do ácido silícico mediante depósito de sílica coloidal, que é registrada pela ocorrência de projeções sob a forma de cones, nas paredes tangenciais internas de determinadas células epidérmicas ou "células de sílica". Folhas de C. ligularis e R. aberrans foram analisadas pela técnica de elétrons retroespalhados. C. ligularis além de acumular sílica nas "células de sílica", acumula também em alguns estômatos, nos tricomas e nas paredes das células que contornam as cavidades do aerênquima. Este último apresenta formas diversas, entretanto, as células que se localizam junto aos feixes vasculares mostram projeções cô-nicas, semelhantes àquelas da epiderme. R. aberrans contém "células de silica" cujas projeções cônicas têm "satélites". A sílica também ocorre em estômatos específi cos e em células epidérmicas contíguas aos mesmos. Constata-se que a deposição de sílica ocorre tanto em combinação com a parede (sem modifi cações estruturais aparentes), como em estruturas de secreção da mesma, ou seja, projeções da parede. Essas variações de ocorrência estrutural e de localização nas espécies devem estar relacionadas com a funcionalidade, fatores ambientais, com destaque ao solo, além da relação com grupos taxonômicos. Palavras-chave: estômatos, células epidérmicas, tricomas, parede celularMaria Emília Maranhão Estelita 1,3 and Ana Claudia Rodrigues 2 ABSTRACT (Silicon location through backscattered electron imaging and X-ray microanalysis in leaves of Cyperus ligularis L. and Rhynchospora aberrans C. B. Clarke (Cyperaceae)). Th e Cyperaceae show the ability to incorporate silicon by depositing colloidal silica, which is recorded by the occurrence of projections in the form of cones, in inner tangential walls of some epidermal cells or "silica cells". Leaves of C. ligularis and R. aberrans were analyzed through the technique of electron backscatter. Cyperus ligularis accumulates silica, in addition to "silica cells", in some stomata, trichomes and the cell walls that surround the cavities of the aerenchyma. Th e silica in the latter occurs in various forms; however, the cells located near the vascular bundles have conical projections, similar to those of the epidermis. Rhynchospora aberrans presents "silica cells" whose projections have tapered "satellites". In this species, silica also occurs in stomata and certain epidermal cells adjacent to them. It appears that the silicon deposition occurs in combination with the wall (with no apparent structural changes), and structures of secretion, or projections of the wall. Th ese structural changes in the species, and location, are probably related to functional and environmental factors, especially the soil, in addition to r...

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Section: Resultsmentioning

confidence: 99%

Silicon location through backscattered electron imaging and X-ray microanalysis in leaves of Cyperus ligularis L. and Rhynchospora aberrans C. B. Clarke (Cyperaceae)

Estelita

Rodrigues

2012

Acta Bot. Bras.

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“…wheat, sugarcane) and a few dicotyledons with 1-3%, and (3) most dicotyledons, especially legumes, with !0.5%. Although silica occurs in many plants, some tree species (Sharma and Rao, 1970;Ter Welle, 1976;Bozarth, 1992) and herbaceous plants such as those of the Poaceae and Cyperaceae are generally considered the most prolific producers of phytoliths (Brown, 1984;Krishnan et al, 2000;Mehra and Sharma, 1965;Mulholland and Rapp, 1992;Parr et al, 2001a;Piperno and Pearsall, 1998;Twiss et al, 1969;Whang et al, 1998). It is also these herbaceous types that generally produce most of the cell wall deposits of silica that contain occluded carbon.…”

Section: Introductionmentioning

confidence: 99%

Soil carbon sequestration in phytoliths

Parr

Sullivan

2005

Soil Biology and Biochemistry

286

243

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“…El engrosamiento y lignificación de las fibras de los cordones esclerenquimáticos subepidérmicos está correlacionada con la presencia de cuerpos de sílice en las células epidérmicas (Mehra & Sharma 1965. Estas células epidérmicas lindantes con los cordones de esclerénquima son siempre de menor profundidad que el resto de las células de la epidermis (Govindarajalu 1974, Esau 1976.…”

Section: Discussionunclassified

Anatomía del sistema caulinar subterráneo de Cyperus corymbosus var: subnodosus (Cyperaceae)

et al. 2010

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RESUMENSe estudia la anatomía del sistema de ramificación subterráneo en Cyperus corymbosus Rottb. var. subnodosus (Nees et Meyen) Kük. Se describe la anatomía del rizoma y del tubérculo en este taxón. Se realiza un análisis comparativo de las variaciones observadas en diferentes estadios de desarrollo. Las características anatómicas de rizoma y tubérculos están asociadas al típico sistema caulinar subterráneo, a la forma de crecimiento de la especie y a su modo de propagación vegetativa.Palabras clave: Histología, rizoma, tubérculo, Cyperus corymbosus, Cyperaceae. ABSTRACTThe anatomy of the underground branching systems in Cyperus corymbosus Rottb. var. subnodosus (Nees et Meyen) Kük. was examined. The anatomy of the rhizome and tuber of this taxon. A comparative analysis of the variations observed in different development stages was also performed. The anatomical characteristics of the rhizome and tubers are associated with the typically underground shoot system, the growth form of the species and its mode of vegetative propagation.

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Epidermal Silica Cells in the Cyperaceae

Cited by 36 publications

References 10 publications

Silicon location through backscattered electron imaging and X-ray microanalysis in leaves of Cyperus ligularis L. and Rhynchospora aberrans C. B. Clarke (Cyperaceae)

Silicon location through backscattered electron imaging and X-ray microanalysis in leaves of Cyperus ligularis L. and Rhynchospora aberrans C. B. Clarke (Cyperaceae)

Soil carbon sequestration in phytoliths

Anatomía del sistema caulinar subterráneo de Cyperus corymbosus var: subnodosus (Cyperaceae)

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