Complex exudates in inflorescences of Vriesea species reveal evidence of lipophilic secretions by scales of bromeliads

Ballego-Campos, Igor; Forzza, Rafaela Campostrini; Paiva, Élder Antônio Sousa

doi:10.1016/j.flora.2023.152228

Cited by 3 publications

(7 citation statements)

References 46 publications

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“…The distinct aspect of the trichome wing cells in several of the studied species, mainly the relatively denser protoplast and distinctive pectic walls, suggest that this region constitutes a separate functional portion of the trichome, which is especially involved in secretion production and release, as suggested previously in W. cyanea and A. blanchetiana ( Ballego-Campos and Paiva 2018 ; Ballego-Campos et al 2020 ). However, secretory activity in the central portion of the trichomes cannot be excluded without an in-depth analysis since the protoplast density and cell wall structure might be difficult to distinguish in some cases.…”

Section: Discussionsupporting

confidence: 74%

“…The remarkable distinctions observed between trichomes of young and mature bracts (e.g. shield cells with dense protoplast and conspicuous nuclei vs. empty lumens and collapsed cell walls at maturity) indicate that the secretory activity is limited to young trichomes in bracts not fully expanded (see Ballego-Campos and Paiva 2018 ; Ballego-Campos et al 2020 ). In the studied species of Tillandsia and V. poenulata , the absence of young developing trichomes is explained by a particularly early and rapid development.…”

Section: Discussionmentioning

confidence: 99%

“…Such exudates behave more like resins or gums, assuming a solid, vitreous aspect when exposed; in contrast, polysaccharide-rich secretions appear as gelatinous exudates that decrease dramatically in volume upon exposure, often reducing to thin films of colourless material. While swelling, gelification and hardening are among general characteristics of plant resins and mucilages ( Langenheim 2003 ; Western 2012 ; Ballego-Campos and Paiva 2018 ), secretions in inflorescences of the studied species are extremely variable and do not allow for characterizations based on aspect. The wide variety of forms in which the secretion can be perceived might be explained based on the secretion composition and its exposure to environmental conditions, such as high/low humidity and precipitation.…”

Section: Discussionmentioning

confidence: 99%

“…Likewise, exposure to the environment might alter the aspect of plant secretions ( Cunningham et al . 1977 ; Langenheim 2003 ; Paiva 2009 ; Ballego-Campos and Paiva 2018 ). In mature bracts, mucilage could also be washed off or even reduced in volume during periods of drought.…”

Section: Discussionmentioning

confidence: 99%

“… Carvalho et al (2017) showed extreme polymorphism in floral peltate trichomes of three Dyckia species and found this character valuable for species delimitation. Recent findings showed that the mucilage covering the young inflorescences of Aechmea blanchetiana and Wallisia cyanea is produced and exuded by the peltate trichomes, and is possibly involved in mechanisms to cope with water-related stresses ( Ballego-Campos and Paiva 2018 ; Ballego-Campos et al 2020 ).…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Discussionsupporting

confidence: 74%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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Two pathways to fleshiness: fruit ontogeny in Bromelioideae species (Bromeliaceae Juss.)

Schürer,

de Carvalho,

Kuhn

2024

Flora

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Can flowers help to disentangle the Vriesea oligantha complex (Bromeliaceae: Tillandsioideae)? Taxonomic implications and contributions to the floral anatomy and biology of Stigmatodon

Silva

Oriani

Versieux

et al. 2023

Botanical Journal of the Linnean Society

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The Vriesea oligantha complex comprises Vriesea lancifolia, Vriesea oligantha, and Vriesea pseudoligantha, which were recently transferred to Stigmatodon. Such species exhibit strong morphological convergence to live in rocky fields, which makes difficult their identification in the wild or in herbarium specimens. In a previous work, leaf characters helped in the species delimitation and evidenced a new taxon. Considering that morphology, anatomy, and aspects of floral biology can contribute to better define species limits and to indicate potential pollinators, individuals from nine populations of V. oligantha complex were comparatively studied. The typical V. oligantha is mainly distinguished by tubular flowers, with simple petal appendages and diurnal anthesis. The remaining individuals studied from different populations exhibit campanulate corollas, with denticulate petal appendages and nocturnal anthesis, not allowing for the separation of V. lancifolia, V. pseudoligantha, and a fourth taxon. Floral anatomy is less variable than the external morphology, with little contribution to the species delimitation; however, it is helpful in the circumscription of Stigmatodon. The infralocular septal nectaries and the floral features provide evidence that the main pollinators of campanulate and tubular flowers are bats and hummingbirds, respectively. Specific pollinator guilds in combination with fragmented populations may explain the limited gene flow amongst populations.

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Complex exudates in inflorescences of Vriesea species reveal evidence of lipophilic secretions by scales of bromeliads

Cited by 3 publications

References 46 publications

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

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

Two pathways to fleshiness: fruit ontogeny in Bromelioideae species (Bromeliaceae Juss.)

Can flowers help to disentangle the Vriesea oligantha complex (Bromeliaceae: Tillandsioideae)? Taxonomic implications and contributions to the floral anatomy and biology of Stigmatodon

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