Changes in cell structure during the formation of root aerenchyma in<i>SAGITTARIA LANCIFOLIA</i> (Alismataceae)

Schussler, Elisabeth E.; Longstreth, David J.

doi:10.2307/2656680

Cited by 70 publications

(45 citation statements)

References 21 publications

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“…This seems similar to a report on PCD in roots. Schussler and Longstreth (2000) showed EM photographs of PCD in Sagittaria alismatifolia roots, indicating that the nucleus was breaking apart into fragments that were each surrounded by a double membrane. However, the fragments were not shown to become completely separated.…”

Section: Discussionmentioning

confidence: 99%

Nuclear fragmentation and DNA degradation during programmed cell death in petals of morning glory (Ipomoea nil)

Yamada

Takatsu²,

Kasumi³

et al. 2006

Planta

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We studied DNA degradation and nuclear fragmentation during programmed cell death (PCD) in petals of Ipomoea nil (L.) Roth Xowers. The DNA degradation, as observed on agarose gels, showed a large increase. Using DAPI, which stains DNA, and Xow cytometry for DAPI Xuorescence, we found that the number of DNA masses per petal at least doubled. This indicated chromatin fragmentation, either inside or outside the nucleus. Staining with the cationic lipophilic Xuoroprobe DiOC 6 indicated that each DNA mass had an external membrane. Fluorescence microscopy of the nuclei and DNA masses revealed an initial decrease in diameter together with chromatin condensation. The diameters of these condensed nuclei were about 70% of original. Two populations of nuclear diameter, one with an average diameter about half of the other, were observed at initial stages of nuclear fragmentation. The diameter of the DNA masses then gradually decreased further. The smallest observed DNA masses had a diameter less than 10% of that of the original nucleus. Cycloheximide treatment arrested the cytometrically determined changes in DNA Xuorescence, indicating protein synthesis requirement. Ethylene inhibitors (AVG and 1-MCP) had no eVect on the cytometrically determined DNA changes, suggesting that these processes are not controlled by endogenous ethylene.

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Section: Discussionmentioning

confidence: 99%

Nuclear fragmentation and DNA degradation during programmed cell death in petals of morning glory (Ipomoea nil)

Yamada

Takatsu²,

Kasumi³

et al. 2006

Planta

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“…Schussler & Longstreth (2000), estudando a formação de aerênquima nas raízes de Sagittaria lancifolia (Alismataceae), relacionaram a lise das células corticais a um tipo de morte celular programada (PCD -programmed cell death). Esses autores também observaram essa característica em estágios avançados do desenvolvimento de Zea mays e Oriza sativa.…”

Section: Discussionunclassified

Anatomia de algumas espécies aquáticas de Eriocaulaceae brasileiras

2002

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RESUMO -(Anatomia de algumas espécies aquáticas de Eriocaulaceae brasileiras). Estudou-se a anatomia de raízes, caules, folhas e escapos de Eriocaulon elichrysoides, Leiothrix fluitans, Paepalanthus obtusifolius, Philodice hoffmannseggii, Syngonanthus caulescens e Tonina fluviatilis, espécies aquáticas de Eriocaulaceae que ocorrem em diferentes ecossistemas brasileiros, visando a caracterização anatômica das mesmas e também a interpretação das adaptações ao ambiente. Essas plantas caracterizam-se por apresentarem raízes com aspecto esponjoso e esbranquiçado; acúmulo de ar no córtex; epiderme unisseriada, de paredes finas; córtex externo, mediano e interno; endoderme unisseriada e periciclo unisseriado ou multisseriado. Em L. fluitans, P. obtusifolius e T. fluviatilis foram observadas raízes absorventes com aerênquima e raízes fixadoras sem aerênquima. Caules aéreos ou rizomatosos, com ou sem espessamentos causados pelo periciclo. Folhas e escapos com células epidérmicas de paredes finas, estômatos somente na face abaxial, parênquima clorofiliano frouxo, tecido de sustentação pouco desenvolvido e feixes vasculares colaterais. Essas estruturas anatômicas são típicas de plantas de ambientes úmidos ou aquáticos, e ocorrem de forma convergente em diferentes gêneros de Eriocaulaceae. Palavras-chave -Anatomia, Eriocaulaceae brasileiras, hidrofitismo, órgãos vegetativosABSTRACT -(Anatomy of some aquatic species of the Brazilian Eriocaulaceae). The anatomy of roots, stems, leaves, and scapes of Eriocaulon elichrysoides, Leiothrix fluitans, Paepalanthus obtusifolius, Philodice hoffmannseggii, Syngonanthus caulescens, and Tonina fluviatilis were studied. All species are aquatic Eriocaulaceae that occur in Brazilian ecosystems. This paper aims to describe the anatomical characterization as well as the interpretation of the adaptations related to the environment. These species present roots with spongy and whitish aspect; air storage in the cortex; thin-walled uniseriate epidermal cells; differentiated cortex; uniseriate endodermis, and uniseriate or multiseriate pericycle. L. fluitans, P. obtusifolius, and T. fluviatilis present roots that store and roots that do not store air in the cortex. The stems are aerial or rhizomatous, with or without thickening resulted from the activity of the pericycle. Leaves and scapes present thin-walled epidermal cells, stomata on the abaxial surface, loosely aggregated chlorenchyma, reduced collenchyma, and collateral vascular bundles. The anatomical features observed are those typical of plants of aquatic or wet habitats. They are convergent and occur in different genera of Eriocaulaceae.

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“…Ultrastructural changes during PCD such as vacuolization, concentric circle of membranes, chromatin condensation and nucleus invaginations observed in the fi lament cells of L. undulatus were reported in aerenchyma formation of Sagittaria lancifolia (SCHUSSLER and LONGSTRETH 2000), endosperm of Oryza sativa (WEI et al 2002), nucellus of Ginkgo biloba (LI et al 2003), tapetal cells of L. undulatus (VARDAR and ÜNAL 2012) and trichome (PAPINI et al 2010) and nucellus of Tillandsia (BRIGHIGNA et al 2006).…”

Section: Discussionmentioning

confidence: 99%

Development and Programmed Cell Death in the Filament Cells of Lathyrus undulatus Boiss.

Vardar

Ünal

2011

Caryologia

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-The androecium in Lathyrus undulatus Boiss. consisted of 10 stamens. The anther was joined to the fi lament on the outward facing surface (dorsifi xed). After dehiscence anther and fi lament separate from connecting edge and anther falls off. In the present study development and programmed cell death process in the fi lament cells of Lathyrus undulatus Boiss. (Fabaceae) were analyzed by light, fl uorescence and electron microcopy, during pollen development. The observations indicated that fi lament cells most fully developed at tetrad stage. The cytochemical identifi cations of proteins, insoluble polysaccharides and lipids within and around the vascular bundle suggest that fi lament cells are involved in the transport of the organic materials. Moreover, fi lament cells subject to programmed cell death confi rmed with TUNEL from young to mature pollen stage including structural alterations such as nucleus and chromatin condensation, vacuolization, concentric circle of membranes and disintegrated plastids. Granular materials and electron lucent areas in the cytoplasm were common at mature pollen stage. The attained data suggests that degenerated anther separate from fi lament by programmed cell death of the connecting edge.

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Changes in cell structure during the formation of root aerenchyma inSAGITTARIA LANCIFOLIA (Alismataceae)

Cited by 70 publications

References 21 publications

Nuclear fragmentation and DNA degradation during programmed cell death in petals of morning glory (Ipomoea nil)

Nuclear fragmentation and DNA degradation during programmed cell death in petals of morning glory (Ipomoea nil)

Anatomia de algumas espécies aquáticas de Eriocaulaceae brasileiras

Development and Programmed Cell Death in the Filament Cells of Lathyrus undulatus Boiss.

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