Floral morphology and anatomy of Dalechampia alata Klotzsch ex Baill. (Euphorbiaceae), with emphasis on secretory structures

Martins, Fabiano Machado; Neto, Israel L. Cunha; Pereira, Thaís Mara Souza

doi:10.1590/1519-6984.19514

Cited by 13 publications

(2 citation statements)

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“…Colleters have been described in at least 60 families of angiosperms (Thomas, 1991), including Apocynaceae (Appezzato-da-Glória and Estelita, 2000; Martins et al, 2013; Ribeiro et al, 2017), Bromeliaceae (Ballego-Campos and Paiva, 2018a,b), Euphorbiaceae (Vitarelli et al, 2015, 2016; Feio et al, 2016; Martins et al, 2016), Fabaceae (Paiva and Machado, 2006; Oliveira and Isaias, 2010), and Rubiaceae (Judkevich et al, 2017; Paiva-Pinheiro et al, 2019). These secretory structures are located in the vegetative and floral buds, and remain in these plant organs throughout their life.…”

Section: Discussionmentioning

confidence: 99%

Deep in the Jelly: Histochemical and Functional Aspects of Mucilage-Secreting Floral Colleters in the Orchids Elleanthus brasiliensis and E. crinipes

et al. 2019

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Colleters are trichomes or emergencies that produce a sticky exudate consisting of a mixture of mucilage, lipids, terpenes, and phenolic compounds. Colleters occur in at least 60 families of angiosperms; however, reports of them are scarce for the Orchidaceae. Elleanthus brasiliensis is distinguished by the presence of an abundant gelatinous secretion that covers almost all of its inflorescences. We aimed to describe the histology of colleters in inflorescences of E. brasiliensis and Elleanthus crinipes , and to analyze the chemical composition of their secretion to better understand the functions of these secretory structures. Due to the low frequency of colleters and lack of visible secretion in E. crinipes , histochemical tests and chemical analyses were not performed for this species. Colleters are of a brush type and their secretion has, at the same time, hydrophilic and lipophilic components. Histochemical tests further revealed the presence of pectin, mucilage, lipids, terpenes, phenolic compounds, and proteins. The GC-MS analysis confirmed the presence of γ-sitosterol and palmitic, linoleic, and stearic acids in the secretion of E. brasiliensis . Infrared analysis indicated the possible presence of polysaccharides in the secretion. The occurrence of colleters in both species studied and in other orchids described in the literature suggests that these structures are common in the inflorescences of tropical orchids. In these environments, the hydrated polysaccharides in the secretion form a dense matrix that can act as a physical barrier, and terpenes may help to protect against herbivores and pathogenic microorganisms. This information broadens our knowledge of the morphological and chemical diversity of the secretions produced by orchid colleters.

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Section: Discussionmentioning

confidence: 99%

Deep in the Jelly: Histochemical and Functional Aspects of Mucilage-Secreting Floral Colleters in the Orchids Elleanthus brasiliensis and E. crinipes

et al. 2019

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“…A maioria das espécies de Dalechampia atrai polinizadores secretando resinas de um complexo modificado de bractéolas situado acima das flores estaminadas da inflorescência (Martins et al 2016). Devido às flores masculinas e femininas estarem reunidas na inflorescência, quando as fêmeas de Euglossini (polinizador de maior eficiência do gênero) pousam sobre as flores para a retirada de resina, tocam as estruturas reprodutivas com a região ventral e pernas, efetuando a polinização (Armbruster & Herzig 1984).…”

Section: Resina Floralunclassified