Structure and function of secretory glochids and nectar composition in two opuntioideae (Cactaceae) species

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MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniversidade Estadual Paulista (Unesp)-
Autor(es): dc.contributorUniversity of Siena-
Autor(es): dc.creatorSilva, Stefany Cristina de Melo [UNESP]-
Autor(es): dc.creatorMachado, Silvia Rodrigues [UNESP]-
Autor(es): dc.creatorNepi, Massimo-
Autor(es): dc.creatorRodrigues, Tatiane Maria [UNESP]-
Data de aceite: dc.date.accessioned2022-02-22T00:35:05Z-
Data de disponibilização: dc.date.available2022-02-22T00:35:05Z-
Data de envio: dc.date.issued2020-12-11-
Data de envio: dc.date.issued2020-12-11-
Data de envio: dc.date.issued2019-12-31-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1139/cjb-2020-0004-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/201990-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/201990-
Descrição: dc.descriptionCactaceae exhibit highly modified spines that are considered to be extrafloral nectaries (EFNs). Despite their ecological and taxonomical relevance in this family, little is known on their structure and function. We have described the anatomy, ontogenesis, and ultrastructure of the secretory glochids in two Opuntioideae species. Young cladodes of Brasiliopuntia brasiliensis (Willd.) A. Berger and Nopalea cochenillifera (L.) Salm-Dyck were processed for light and electron microscopy studies. The composition of the secretions was analyzed by high performance liquid chromatography. The secretory glochids were soft, massive, and barbed, as well as translucent. Hyaline droplets on the secretory glochid apex were collected by aggressive ants. The secretory glochids originated from the areolar meristem, beginning as small protuberances formed by protoderm and ground meristem. Mature secretory glochids consisted of a central multiseriate axis of ground cells covered by uniseriate epidermis with a continuous cuticle, and exhibited three regions: (i) dilated vascularized base with parenchyma cells exhibiting features associated to nectar secretion; (ii) elongated median region with juxtaposed fusiform non-lignified parenchyma cells; and (iii) tapered apical portion with immature fibers loosely arranged cells. The exudate was sucrose-dominant with a similar amino acid profile in both species. Our results shed light on the secretory activity of glochids in Cactaceae and their role in cactus–ant interactions.-
Descrição: dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)-
Descrição: dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)-
Descrição: dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)-
Descrição: dc.descriptionUNESP – São Paulo State University Institute of Biosciences Department of Botany-
Descrição: dc.descriptionUniversity of Siena Department of Life Sciences-
Descrição: dc.descriptionUNESP – São Paulo State University Institute of Biosciences Department of Botany-
Descrição: dc.descriptionCAPES: 001-
Descrição: dc.descriptionFAPESP: 2017 / 14891-5-
Descrição: dc.descriptionCNPq: 303981/ 2018-0-
Descrição: dc.descriptionCNPq: 304396/2015-0-
Formato: dc.format425-437-
Idioma: dc.languageen-
Relação: dc.relationBotany-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectAnatomy-
Palavras-chave: dc.subjectBrasiliopuntia brasiliensis-
Palavras-chave: dc.subjectCactus-
Palavras-chave: dc.subjectNectar-
Palavras-chave: dc.subjectNopalea cochenillifera-
Palavras-chave: dc.subjectSecretory spines-
Palavras-chave: dc.subjectUltrastructure-
Título: dc.titleStructure and function of secretory glochids and nectar composition in two opuntioideae (Cactaceae) species-
Tipo de arquivo: dc.typelivro digital-
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