New evidence of floral elaiophores and characterization of the oil flowers in the subtribe Oncidiinae (Orchidaceae)

Gomiz, Natalia E.; Torretta, Juan Pablo; Aliscioni, Sandra S.

doi:10.1007/s00606-016-1382-7

Cited by 8 publications

(4 citation statements)

References 27 publications

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“…In all cases, the labellum is ornamented, bearing complex, callus‐like epithelial elaiophores (oil‐secreting glands). In agreement with preceding literature (Chiron et al, 2009; Gomiz et al, 2013, 2017; Stpiczyńska et al, 2013), all labellar, callus‐like structures in the studied species stained with Sudan IV and are thus referred to as elaiophores. The labellum is considerably longer and broader than the other perianth parts in G. flexuosa and G. ranifera .…”

Section: Resultssupporting

confidence: 91%

“…(Clade 2 in this work) (Reis et al, 2000) and most (if not all) species formerly placed in the genera Coppensia Dumort., Hardingia Docha Neto & Baptista, and Menezesiella Chiron & V.P. Castro (Clade 1 in this work) (Chiron et al, 2009; Gomiz et al, 2013, 2017; Reis et al, 2000; Singer et al, 2006; Stpiczyńska et al, 2013; Stpiczyńska & Davies, 2008). Yet, floral oils may be either absent or present, yet held between the cuticle and the cell wall in Gomesa species formerly placed in the genera Alatiglossum D.H.Baptista, Brasilidium Campacci, Gomesa s.s., Ornithophora Barb.…”

Section: Discussionmentioning

confidence: 56%

“…Flower features (shape, size, column and perianth features, etc.) were studied in fresh flowers produced by the Elaiophores (oil-secreting glands) and their secretions were already reported and detailed in the literature for G. flexuosa (Gomiz et al, 2013), G. ranifera (Stpiczy nska et al, 2013), G. cornigera (Chiron et al, 2009;Gomiz et al, 2017;Singer, 2009), and G. riograndensis (Chiron et al, 2009;Gomiz et al, 2013). All these elaiophores are epithelial and spread through the entire callus surface.…”

Section: Floral Features and Pollinarium Reconfigurationmentioning

confidence: 99%

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Pollination biology and reproductive success in four Brazilian species of Gomesa (Orchidaceae: Oncidiinae): Specific pollinators, but high pollen loss and low fruit set

Castro

Perdomo

Singer

2021

Plant Species Biology

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Four species of Gomesa (Gomesa flexuosa, Gomesa ranifera, Gomesa cornigera, and Gomesa riograndensis), a horticulturally important, albeit scarcely studied orchid genus, were investigated. Pollination biology was studied through fieldwork in Rio Grande do Sul in Southern Brazil during two flowering seasons.Breeding systems were studied through controlled pollinations in cultivated plants. All studied species secrete floral oils through elaiophores and are exclusively pollinated by native, oil-collecting bees of the Centridini or Tapinotaspidini tribes. Pollinarium reconfiguration after withdrawal, a feature likely promoting cross-pollination, was recorded in G. cornigera and G. riograndensis. All studied species are pollinator-dependent and either predominantly or fully self-incompatible, that is, unable to set fruit following self-pollination. The used indexes of pollination efficiency consistently scored values below 1, indicating that in all studied species less than one flower is pollinated per pollinarium removed. Accordingly, pollen loss was high, ranging from 40% to 75%. Furthermore, inflorescences in natural populations displayed low fruit sets (below 13%). Gomesa flexuosa presented the highest values of pollinarium removal (36.24%) and deposition (15.34%).Significantly, this is the only studied species bearing a tabula infraestigmatica, a column swelling that bees hold to stabilize themselves while gathering the floral oils. Since pollinators were observed in all studied species spending considerable time (up to 3 min 46 s) and visiting several (up to 19) flowers, we propose that the observed low fruit set is the result of a combination of self-incompatibility, pollinator-mediated self-pollination, and pollen loss.

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Section: Resultssupporting

confidence: 91%

Section: Discussionmentioning

confidence: 56%

Section: Floral Features and Pollinarium Reconfigurationmentioning

confidence: 99%

See 1 more Smart Citation

Pollination biology and reproductive success in four Brazilian species of Gomesa (Orchidaceae: Oncidiinae): Specific pollinators, but high pollen loss and low fruit set

Castro

Perdomo

Singer

2021

Plant Species Biology

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“…2016; Gomiz et al . 2017). Studies of small‐flowered Oncidiinae have been conducted on only a few species, and this subtribe is still little explored.…”

Section: Introductionmentioning

confidence: 99%

So small and so rich: diversity of floral resources in miniature Oncidiinae (Orchidaceae) and their relation to pollinators

Pansarin

Alves‐dos‐Santos

et al. 2020

Plant Biol J

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Oncidiinae is one of the most important subtribes among the Neotropical orchids, with an enormous diversity of floral morphology and secretory structures. This subtribe attracts a diverse array of pollinators which explore a variety of floral resources of its flowers. In this paper we provide a detailed investigation of the floral anatomy of 32 species of micro Oncidiinae. We applied histochemical tests in order to determine the diversity of the glands and rewards. The diversity of secretory flower structures and rewards was related to the group of pollinators known for this subtribe. We verified that half of the species (16 species, 50%) secrete oil as a resource, being pollinated by female of solitary bees. Species of some distinct nectar‐secreting genera (four species, 12.5%) are pollinated by a range of nectar‐searching animals. Species of the genus Notylia (four species, 12.5%) release floral perfumes that reward male Euglossini bees. Most of the investigated species (six species, 18.75%) possess osmophores that are involved in pollinator attraction. Two species of Capanemia (6.25%) do not offer any floral reward, suggesting that pollination by food deception is involved. There are strong variations in the anatomy of reward‐producing structures and resources in Oncidiinae. The diversity of floral rewards affects the range of pollinators, which are related to the diversification of this subtribe throughout the Neotropics. The understanding of relationships between Oncidiinae species and their pollinators is crucial to our knowledge of the evolution of pollination systems in this huge plant family represented by the orchids.

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Müllerian mimicry between oil-producing orchids and Malpighiaceae? An old hypothesis finally tested

Castro

Machado

Singer

2021

Sci Nat

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New evidence of floral elaiophores and characterization of the oil flowers in the subtribe Oncidiinae (Orchidaceae)

Cited by 8 publications

References 27 publications

Pollination biology and reproductive success in four Brazilian species of Gomesa (Orchidaceae: Oncidiinae): Specific pollinators, but high pollen loss and low fruit set

Pollination biology and reproductive success in four Brazilian species of Gomesa (Orchidaceae: Oncidiinae): Specific pollinators, but high pollen loss and low fruit set

So small and so rich: diversity of floral resources in miniature Oncidiinae (Orchidaceae) and their relation to pollinators

Müllerian mimicry between oil-producing orchids and Malpighiaceae? An old hypothesis finally tested

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