Apoplasmic barrier in the extrafloral nectary of Citharexylum myrianthum (Verbenaceae)

Registro completo de metadados
MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.creatorMachado, Silvia Rodrigues-
Autor(es): dc.creatorRodrigues, Tatiane Maria-
Data de aceite: dc.date.accessioned2025-08-21T18:42:35Z-
Data de disponibilização: dc.date.available2025-08-21T18:42:35Z-
Data de envio: dc.date.issued2022-04-29-
Data de envio: dc.date.issued2022-04-29-
Data de envio: dc.date.issued2021-08-01-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1007/s00425-021-03663-8-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/229075-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/229075-
Descrição: dc.descriptionMain conclusion: The cytological changes underlying the formation of an apoplasmic barrier in the multi-layered extrafloral nectaries of Citharexylum myrianthum are compatible with the synthesis, transport and deposition of suberin. In terms of ontogenesis and function, the intermediate layers of these nectaries are homologous with the stalks of nectar-secreting trichomes. Abstract: Anticlinal cell wall impregnations are common in trichomatic nectaries and their functions as endodermis-like barriers have been discussed because of possible direct effects on the nectary physiology, mainly in the nectar secretion and resorption. However, the cytological events linked to nectary wall impregnations remain little explored. This study documents the ontogenesis and the fine structure of the EFN cells, and cytological events linked to the wall impregnations of multi-layered extrafloral nectaries (EFNs) in Citharexylum myrianthum Cham. (Verbenaceae). EFNs are patelliform, and differentiated into (a) a multicellular foot, which is compound in structure and vascularised with phloem strands, (b) a bi-layered intermediate region with thickened cell walls and (c) a single-layered secretory region with palisade-like cells. EFNs are protodermal in origin, starting with a single protodermal cell and ending with the complex, multi-layered structure. The cell wall impregnations first appear in the very young EFN and increase towards maturity. Lipid patches (assumed to be suberin) are deposited on the inner faces of the primary walls, first along the anticlinal walls and then extend to the periclinal walls. On both walls, plasmodesmata remain apparently intact during the maturation of the EFNs. In the peripheral cytoplasm there are abundant polymorphic plastids, well-developed Golgi bodies often close to rough endoplasmic reticulum profiles, mitochondria and polyribosomes. Cytological events linked to the wall impregnations are consistent with suberin synthesis, transport and deposition. Our findings offer new insights into the structure-properties of specialised nectary cell walls and so should contribute to our knowledge of the physiological and protective roles of this structure in nectar glands.-
Descrição: dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)-
Descrição: dc.descriptionCentre of Electron Microscopy (CME) Institute of Biosciences of Botucatu (IBB) São Paulo State University (UNESP)-
Descrição: dc.descriptionDepartment of Biostatistics Plant Biology Parasitology and Zoology Institute of Biosciences of Botucatu (IBB) São Paulo State University (UNESP)-
Descrição: dc.descriptionCentre of Electron Microscopy (CME) Institute of Biosciences of Botucatu (IBB) São Paulo State University (UNESP)-
Descrição: dc.descriptionDepartment of Biostatistics Plant Biology Parasitology and Zoology Institute of Biosciences of Botucatu (IBB) São Paulo State University (UNESP)-
Descrição: dc.descriptionCNPq: 303981/2018-0-
Descrição: dc.descriptionCNPq: 308982/2020-7-
Descrição: dc.descriptionCNPq: 401053/2016-4-
Idioma: dc.languageen-
Relação: dc.relationPlanta-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectCell wall impregnation-
Palavras-chave: dc.subjectLipid barrier-
Palavras-chave: dc.subjectNectar secretion-
Palavras-chave: dc.subjectPatelliform extrafloral nectary-
Palavras-chave: dc.subjectUltrastructure-
Título: dc.titleApoplasmic barrier in the extrafloral nectary of Citharexylum myrianthum (Verbenaceae)-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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