Abstract
Secretory trichomes and colleters are two of the secretory structures whose exudates may cover the body of the plant. Such secretions comprise resins or mucilages which are associated with an array of ecological roles. In Rosaceae, secretory trichomes have been reported for the leaves while colleters associated with leaf teeth. Our study aimed to identify the secretory structures of Rosa lucieae and understand the ecological role played by these glands as interpreted by morphoanatomical and histochemical studies. Samples from developing and fully mature leaves were collected, fixed, and processed according to usual techniques for light and scanning electron microscopy. In R. lucieae, colleters are restricted to the leaf and stipular margins and are associated with the teeth. They present a parenchymatous axis surrounded by a secretory palisade epidermis and usually fall off after the secretory activity is finished. Different from colleters, secretory trichomes are persistent. They present a multicellular secretory head and stalk. They are found at the base of the leaflet, petiolule, rachis, and petiole and occasionally on the stipular and leaf margins. The colleters predominantly secrete mucilages while the secretory trichomes secrete lipids and terpenes, both via cuticle rupture. The secretory activity of colleters is predominant in the leaf primordia, holding leaflets together and protecting meristems and leaves from desiccation, while the secretory trichomes maintain their secretory activity at different stages of leaf development, protecting different regions of the leaf against pathogens and herbivores.
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This study was supported by the Ministério da Ciência e Tecnologia/Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq; Brasília, Brazil; Grant 406824/2016–9 to Valdnéa Casagrande Dalvi).
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The research project was designed by Valdnéa Casagrande Dalvi. The samples were collected by Valdnéa Casagrande Dalvi and Maycon de Sousa Silva; light microscopy and histochemical analyses were performed by Maycon de Sousa Silva; scanning microscopy was performed by Valdnéa Casagrande Dalvi. The manuscript was written by Valdnéa Casagrande Dalvi, Maycon de Sousa Silva, Alex Batista Moreira Rios, and Ítalo Antônio Cotta Coutinho.
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Dalvi, V.C., de Sousa Silva, M., Rios, A.B.M. et al. Leaf secretory structures in Rosa lucieae (Rosaceae): two times of secretion—two ecological functions?. Protoplasma 261, 245–256 (2024). https://doi.org/10.1007/s00709-023-01892-0
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DOI: https://doi.org/10.1007/s00709-023-01892-0