The short but useful life of Prepusa montana Mart. (Gentianaceae Juss.) leaf colleters—anatomical, micromorphological, and ultrastructural aspects

Gonçalves, Jailma Rodrigues; Rocha, Diego Ismael; Santos, Luana Silva; Dalvi, Valdnéa Casagrande

doi:10.1007/s00709-021-01651-z

Cited by 4 publications

(2 citation statements)

References 76 publications

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“…However, Tabernaemontana has cells with poorly developed vacuoles, and the periclinal cell walls are thicker than the anticlinal ones [5]. This differential thickness may be related to the mode of secretion release [21,22], as discussed below.…”

Section: Discussionmentioning

confidence: 97%

“…The lack of ultrastructural studies likely led most authors to misinterpret these hydrophilic pathways as cuticular "microchannels" [37]. Miguel et al [21] and Gonçalves et al [22] observed that the structural organization of the outer periclinal wall of colleters in Bathysa and Prepusa changes during passage of the secretion, forming a space where the secretion is accumulated. However, this space initially formed in the pectin layer of cell wall, reaches the cuticular layer at maturity [21] and corresponds to the subcuticular space, as observed in Allamanda and Blepharodon.…”

Section: Secretion Releasementioning

confidence: 99%

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Secretory Patterns in Colleters of Apocynaceae

Ribeiro

Tölke

Demarco

2021

Plants

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Colleters of Apocynaceae are glands related to different types of protection of vegetative and floral meristems through the production of mucilage or a mixture of many different compounds. Although several anatomical papers have shown histological and histochemical aspects of colleters of the family, almost nothing is known about their secretory process. In this study, we analyzed two types of colleters in Apocynaceae: one produces mucilage and lipophilic compounds, while the other produces an exclusively mucilaginous secretion. The secretory epidermis of the colleters of Allamanda schottii and Blepharodon bicuspidatum has a dense cytoplasm with organelles responsible for the production of mucilage and lipids. This heterogeneous secretion is released through granulocrine and eccrine mechanisms and is temporarily stored in a subcuticular space before crossing the cuticle. Conversely, colleters of Mandevilla splendens and Peplonia axillaris produce only mucilage and have a very different secretory apparatus. The mechanism of secretion is granulocrine, and the exudate is firstly accumulated in a large periplasmic space and later in an intramural space before crossing the cuticle. Notably, the structure of the cuticle varies according to the secretion composition. Although the colleters of the family are histologically similar, this study demonstrates a metabolic and subcellular variability previously unknown for Apocynaceae.

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Section: Discussionmentioning

confidence: 97%

Section: Secretion Releasementioning

confidence: 99%

Secretory Patterns in Colleters of Apocynaceae

Ribeiro

Tölke

Demarco

2021

Plants

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Structural similarity versus secretion composition in colleters of congeneric species of Prepusa (Gentianaceae)

Dourado

Rocha

Kuster

et al. 2022

Flora

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An overview of secretion in floral bracts of Tillandsioideae (Bromeliaceae), with emphasis on the secretory scales

Ballego-Campos,

Forzza,

Paiva

2023

AoB PLANTS

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Bromeliaceae display many water-use strategies, from leaf impounding tanks to CAM photosynthesis and absorbing trichomes. Recent studies show that trichomes in inflorescences of bromeliads can exude viscous secretions, protecting against various stresses, including excessive water loss. In light of this, and considering the knowledge gap regarding inflorescence trichomes in bromeliads, we aimed to investigate the presence, source, and chemical nature of inflorescence secretions in species of the Tillandsioideae (Bromeliaceae) and to describe the anatomy of their floral bracts focusing on trichome structure and position.We conducted a prospection of secretory activity and anatomy in floral bracts in 52 species of Tillandsioideae and one early-divergent Bromeliaceae species. We used histochemical tests to investigate the presence and nature of secretion combined with standard light microscopy methods. Secretion appears in all studied species of tribe Vrieseeae, in Guzmania species, Wallisia cyanea, Tillandsia streptopylla (Tillandsieae), and Catopsis morreniana (Catopsideae). It is absent in Vriesea guttata (Vrieseeae), Racinaea crispa, and various Tillandsia species (Tillandsieae). Secretion is produced by peltate trichomes on the adaxial surface of young bracts and comprises hydrophilic and lipophilic substances. Bract anatomy revealed an internal mucilage-secreting tissue with wide distribution within subtribe Vrieseinae. Our results point to a broad occurrence of secretion associated with bracteal scales in inflorescences of Tillandsioideae. Secretory function is strongly related to trichomes of the adaxial surface, whereas the indumentum of the abaxial side is lacking or likely associated with water absorption; the latter case is especially related to small, xeric plants. Exudates might engage in colleter-like roles, protecting against desiccation, high-radiation, and herbivores. Directions for future research are presented.

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The short but useful life of Prepusa montana Mart. (Gentianaceae Juss.) leaf colleters—anatomical, micromorphological, and ultrastructural aspects

Cited by 4 publications

References 76 publications

Secretory Patterns in Colleters of Apocynaceae

Secretory Patterns in Colleters of Apocynaceae

Structural similarity versus secretion composition in colleters of congeneric species of Prepusa (Gentianaceae)

An overview of secretion in floral bracts of Tillandsioideae (Bromeliaceae), with emphasis on the secretory scales

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