Peltate trichomes in the dormant shoot apex of Metrodorea nigra, a Rutaceae species with rhythmic growth

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Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.contributorFederal University of Rio de Janeiro-
Autor(es): dc.creatorMachado, S. R.-
Autor(es): dc.creatorde Deus Bento, K. B.-
Autor(es): dc.creatorCanaveze, Y.-
Autor(es): dc.creatorRodrigues, T. M.-
Data de aceite: dc.date.accessioned2025-08-21T17:40:42Z-
Data de disponibilização: dc.date.available2025-08-21T17:40:42Z-
Data de envio: dc.date.issued2023-07-29-
Data de envio: dc.date.issued2023-07-29-
Data de envio: dc.date.issued2022-12-31-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1111/plb.13480-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/247920-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/247920-
Descrição: dc.descriptionIn Metrodorea nigra, a Rutaceae species with rhythmic growth, the shoot apex in the dormant stage is enclosed by modified stipules. The young organs are fully covered with peltate secretory trichomes, and these structures remain immersed in a hyaline exudate within a hood-shaped structure. Our study focused on the morpho-functional characterization of the peltate trichomes and cytological events associated with secretion. Shoot apices were collected during both dormant and active stages and processed for anatomical, cytochemical and ultrastructural studies. Trichomes initiate secretion early on, remain active throughout leaf development, but collapse as the leaves expand; at which time secretory cavities start differentiation in the mesophyll and secretion increases as the leaf reaches full expansion. The subcellular apparatus of the trichome head cells is consistent with hydrophilic and lipophilic secretion. Secretion involves two vesicle types: the smaller vesicles are PATAg-positive (periodic acid/thiocarbohydrazide/silver proteinate) for carbohydrates and the larger ones are PATAg-negative. In the first phase of secretory activity, the vesicles containing polysaccharides discharge their contents through exocytosis with the secretion accumulating beneath the cuticle, which detaches from the cell wall. Later, a massive discharge of lipophilic substances (lipids and terpenes/phenols) results in their accumulation between the wall and cuticle. Release of the secretions occurs throughout the cuticular microchannels. Continued protection of the leaves throughout shoot development is ensured by replacement of the collapsed secretory trichomes by oil-secreting cavities. Our findings provide new perspectives for understanding secretion regulation in shoot apices of woody species with rhythmic growth.-
Descrição: dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)-
Descrição: dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)-
Descrição: dc.descriptionCenter of Electron Microscopy (CME) Institute of Biosciences of Botucatu (IBB) São Paulo State University (UNESP), SP-
Descrição: dc.descriptionPostgraduate Program in Plant Biology Interunits Paulo State University (UNESP), SP-
Descrição: dc.descriptionDepartment of Botany Institute of Biology Federal University of Rio de Janeiro, RJ-
Descrição: dc.descriptionDepartment of Biostatistics Plant Biology Parasitology and Zoology Institute of Biosciences – IBB São Paulo State University – UNESP, SP-
Descrição: dc.descriptionCenter of Electron Microscopy (CME) Institute of Biosciences of Botucatu (IBB) São Paulo State University (UNESP), SP-
Descrição: dc.descriptionPostgraduate Program in Plant Biology Interunits Paulo State University (UNESP), SP-
Descrição: dc.descriptionDepartment of Biostatistics Plant Biology Parasitology and Zoology Institute of Biosciences – IBB São Paulo State University – UNESP, SP-
Descrição: dc.descriptionCAPES: 001-
Descrição: dc.descriptionCNPq: 308982/2020-7-
Descrição: dc.descriptionCNPq: 312900/2021-0-
Descrição: dc.descriptionCNPq: 401053/2016-4-
Formato: dc.format161-175-
Idioma: dc.languageen-
Relação: dc.relationPlant Biology-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectCytochemistry-
Palavras-chave: dc.subjectcytology-
Palavras-chave: dc.subjectpeltate secretory trichomes-
Palavras-chave: dc.subjectRutaceae-
Palavras-chave: dc.subjectultrastructure-
Título: dc.titlePeltate trichomes in the dormant shoot apex of Metrodorea nigra, a Rutaceae species with rhythmic growth-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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