Leaf secretory structures in Rosa lucieae (Rosaceae): two times of secretion—two ecological functions?

Dalvi, Valdnéa Casagrande; de Sousa Silva, Maycon; Rios, Alex Batista Moreira; Coutinho, Ítalo Antônio Cotta

doi:10.1007/s00709-023-01892-0

Cited by 1 publication

(2 citation statements)

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“…The location of leaf glands at the apex of leaf teeth in G. polygama coincides with that of Prunus species [45], Mespilus germanica [46], and Rosa lucieae [47]. According to the authors, the presence of sticky exudate and the loss of the secretory head of the glands after exudate release in these species indicate that they are colleters.…”

Section: The Foliar Glands Of Gouania Polygama and Those Of Rosaceae ...mentioning

confidence: 79%

“…These trichomes must still be submitted to histochemical and ultrastructural analyses to check if they secrete nectar, and thus, characterized as nectariferous. The internal glands can be defined as oil-resin secreting ducts and cavities (Rhamnidium elaeocarpum, present study) and lysogenic mucilage reservoirs (many species [46,47,50]). This diversity is also seen in the flowers of the species of the family [29,30], indicating that this group is a promising model for studies of the morphology and evolution of secretory structures.…”

Section: Discussionmentioning

confidence: 98%

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Diversity of Leaf Glands and Their Putative Functions in Rhamnaceae Species

Iwamoto,

Vicentini,

Ramos

et al. 2023

Plants

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Leaf glands are found in many Rhamnaceae species, the buckthorn family, and are frequently used in taxonomic studies of the group, especially because they are easily visible to the naked eye. Despite the many records and extensive use in the taxonomy of the family, few studies deal with the classification of these glands and their roles for the plant. Thus, this study aimed to unravel the type, functioning, and putative functions of the leaf glands of three Brazilian forest species: Colubrina glandulosa Perkins, Gouania polygama (Jacq.) Urb., and Rhamnidium elaeocarpum Reissek. Leaves were collected and processed for surface, anatomical, histochemical, and ultrastructural analyses. In addition, the presence of visitor animals was registered in the field. The leaf glands of C. glandulosa and G. polygama are defined as extrafloral structured nectaries due to their anatomical structure, interaction with ants, and the presence of reduced sugars and of a set of organelles in the secretory cells. The unusual mechanism of nectar release and exposure in an apical pore stands out in G. polygama. The glands of R. elaeocarpum are ducts or cavities that secrete phenolic oil resin. Their presence is an atypical condition in the family, although they are often confused with mucilage reservoirs, much more common in Rhamnaceae. The extrafloral nectary, secretory cavity, and duct are associated with plant protection against phytophages, either by attracting patrol ants or by making the organs deterrent. Our data, combined with other previously obtained data, attest to the great diversity of gland types found in Rhamnaceae species.

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Section: The Foliar Glands Of Gouania Polygama and Those Of Rosaceae ...mentioning

confidence: 79%