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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/74186
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dc.contributor.authorDe-Paula, Orlando Cavalari-
dc.contributor.authorMarzinek, Juliana-
dc.contributor.authorOliveira, Denise Maria Trombert-
dc.contributor.authorMachado, Silvia Rodrigues-
dc.date.accessioned2014-05-27T11:27:29Z-
dc.date.accessioned2016-10-25T18:40:58Z-
dc.date.available2014-05-27T11:27:29Z-
dc.date.available2016-10-25T18:40:58Z-
dc.date.issued2013-01-01-
dc.identifierhttp://dx.doi.org/10.1016/j.micron.2012.08.003-
dc.identifier.citationMicron, v. 44, n. 1, p. 312-316, 2013.-
dc.identifier.issn0968-4328-
dc.identifier.urihttp://hdl.handle.net/11449/74186-
dc.identifier.urihttp://acervodigital.unesp.br/handle/11449/74186-
dc.description.abstractMelanins are dark, insoluble pigments that are resistant to concentrated acids and bleaching by oxidising agents. Phytomelanin (or phytomelan) is present in the seed coat of some Asparagales and in the fruits of some Compositae. In Compositae fruits, melanin is deposited in the schizogenous spaces between the hypodermis and underlying fibrous layer. Phytomelanin in Compositae is poorly understood, and there are only speculations regarding the cells that produce the pigment and the cellular processes involved in the secretion and polymerisation of phytomelanin. This report describes the cellular processes involved in the secretion of phytomelanin in the pericarp of Praxelis diffusa, a species with a structure typical of the family. The ovaries and fruits at different stages were fixed and processed according to the standard methods of studies of light microscopy and transmission electron microscopy. Hypodermal cells have abundant rough endoplasmic reticulum and mitochondria, and the nuclei have chromatin that is less dense than other cells. These characteristics are typical of cells that synthesise protein/amino acids and suggest no carbohydrate secretion. The fibres, however, have a dense cytoplasm rich in the Golgi bodies that are associated with vesicles and smooth endoplasmic reticulum, common characteristics of carbohydrate secretory cells. Our results indicate that the hypodermal cells are not responsible for the secretion of phytomelanin, as previously described in the literature; in contrast, this function is assigned to the adjacent fibres, which have an organisation typical of cells that secrete carbohydrates. © 2012 Elsevier Ltd.en
dc.format.extent312-316-
dc.language.isoeng-
dc.sourceScopus-
dc.subjectAsteraceae-
dc.subjectCypsela-
dc.subjectFruit-
dc.subjectPhytomelan-
dc.subjectPhytomelanin-
dc.subjectSecretory structure-
dc.subjectCellular process-
dc.subjectCompositae-
dc.subjectEndoplasmic reticulum-
dc.subjectGolgi bodies-
dc.subjectHypodermal cells-
dc.subjectRough endoplasmic reticulums-
dc.subjectSecretory cells-
dc.subjectSeed coats-
dc.subjectStandard method-
dc.subjectCarbohydrates-
dc.subjectCell membranes-
dc.subjectFruits-
dc.subjectPhysiology-
dc.subjectTransmission electron microscopy-
dc.subjectCytology-
dc.subjectmelanin-
dc.subjectbiosynthesis-
dc.subjectcytoplasm-
dc.subjectendoplasmic reticulum-
dc.subjectflower-
dc.subjectGolgi complex-
dc.subjectmetabolism-
dc.subjectmitochondrion-
dc.subjectsecretion (process)-
dc.subjectsubcutaneous tissue-
dc.subjecttransmission electron microscopy-
dc.subjectCytoplasm-
dc.subjectEndoplasmic Reticulum-
dc.subjectFlowers-
dc.subjectGolgi Apparatus-
dc.subjectMelanins-
dc.subjectMicroscopy, Electron, Transmission-
dc.subjectMitochondria-
dc.subjectSubcutaneous Tissue-
dc.subjectAsparagales-
dc.subjectPraxelis diffusa-
dc.titleThe role of fibres and the hypodermis in Compositae melanin secretionen
dc.typeoutro-
dc.contributor.institutionUniversidade Federal do Paraná (UFPR)-
dc.contributor.institutionUniversidade Federal de Uberlândia (UFU)-
dc.contributor.institutionUniversidade Federal de Minas Gerais (UFMG)-
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)-
dc.description.affiliationDepartamento de Botânica Setor de Ciências Biológicas Universidade Federal do Paraná, Curitiba, PR-
dc.description.affiliationInstituto de Biologia Universidade Federal de Uberlândia, Uberlândia, MG-
dc.description.affiliationDepartamento de Botânica Instituto de Ciências Biológicas Universidade Federal de Minas Gerais, Belo Horizonte, MG-
dc.description.affiliationDepartamento de Botânica Instituto de Biociências UNESP-Universidade Estadual Paulista, Botucatu, SP-
dc.description.affiliationUnespDepartamento de Botânica Instituto de Biociências UNESP-Universidade Estadual Paulista, Botucatu, SP-
dc.identifier.doi10.1016/j.micron.2012.08.003-
dc.identifier.wosWOS:000312925300034-
dc.rights.accessRightsAcesso restrito-
dc.relation.ispartofMicron-
dc.identifier.scopus2-s2.0-84870724009-
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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