Megagametophyte development and female sterility in Maytenus obtusifolia Mart. (Celastraceae)

Registro completo de metadados
MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniversidade Federal do Rio de Janeiro (UFRJ)-
Autor(es): dc.contributorUniversidade Estadual Paulista (Unesp)-
Autor(es): dc.creatorNader Haddad, Isabella Verissimo-
Autor(es): dc.creatorSa-Haiad, Barbara de-
Autor(es): dc.creatorRibeiro de Santiago-Fernandes, Lygia Dolores-
Autor(es): dc.creatorMachado, Silvia Rodrigues [UNESP]-
Data de aceite: dc.date.accessioned2022-02-22T00:09:15Z-
Data de disponibilização: dc.date.available2022-02-22T00:09:15Z-
Data de envio: dc.date.issued2020-12-09-
Data de envio: dc.date.issued2020-12-09-
Data de envio: dc.date.issued2019-10-31-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1007/s00709-019-01413-y-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/196370-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/196370-
Descrição: dc.descriptionReproduction in flowering plants is closely related to the megagametophyte, since the megagametophyte is involved in pollen tube reception and contains the two female gametes-egg cell and central cell. Previous conventional light microscopy methods have shown that female sterility in perfect flowers of Maytenus obtusifolia is associated with the occurrence of sterile ovules whose megagametophytes have hypertrophied synergids. Here, using transmission electron microscopy and cytochemical methods, we compare the megagametophytes in fertile and sterile ovules from perfect and pistillate flowers, and investigate the cellular events that result in the degradation of the megagametophyte cells from sterile ovules. In fertile ovules of perfect and pistillate flowers, mature megagametophytes have two synergids, egg cell and central cell. In fertile ovules, the synergids present an extensive rough endoplasmic reticulum (RER) profile, large populations of mitochondria, when compared to egg cells, vesicles, Golgi bodies, plastids and a nucleus with heterochromatin. Besides that, the egg cell has a small population of organelles and the central cell exhibits cytoplasm with free ribosomes, RER, vesicles originating from the RER, Golgi bodies and oil inclusions. In mature megagametophytes from sterile ovules of perfect and pistillate flowers, massive autophagy occurs by tonoplast rupture promoting hydrolase release, leading to protoplast and cell wall degradation-typical evidence of programmed cell death (PCD). Therefore, female sterility in the majority of M. obtusifolia sterile ovules is the result of PCD by massive autophagy in the megagametophyte cells. In a few other sterile ovules, sterility is due to the delayed or the absence of megagametophyte development.-
Descrição: dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)-
Descrição: dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)-
Descrição: dc.descriptionFundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ)-
Descrição: dc.descriptionUniv Fed Rio de Janeiro, Museu Nacl, Dept Bot, BR-22940040 Rio De Janeiro, RJ, Brazil-
Descrição: dc.descriptionUniv Estadual Paulista, Inst Biociencias, Dept Bot, BR-18618000 Sao Paulo, SP, Brazil-
Descrição: dc.descriptionUniv Estadual Paulista, Inst Biociencias, Dept Bot, BR-18618000 Sao Paulo, SP, Brazil-
Descrição: dc.descriptionCNPq: 304396/20150-
Descrição: dc.descriptionFAPERJ: E-26/111.207/2014-
Descrição: dc.descriptionCNPq: 447624/2014-8-
Formato: dc.format1667-1680-
Idioma: dc.languageen-
Publicador: dc.publisherSpringer-
Relação: dc.relationProtoplasma-
???dc.source???: dc.sourceWeb of Science-
Palavras-chave: dc.subjectAutophagy-
Palavras-chave: dc.subjectCytochemistry-
Palavras-chave: dc.subjectProgrammed cell death (PCD)-
Palavras-chave: dc.subjectUltrastructure-
Palavras-chave: dc.subjectVacuolar cell death-
Título: dc.titleMegagametophyte development and female sterility in Maytenus obtusifolia Mart. (Celastraceae)-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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