Resupination in Flowers of Two Dendrobium (Orchidaceae) Hybrids: Effects of Nodal Position and Removal of Floral Segments

Nyman, L. P.; Soediono, Noes; Arditti, Joseph

doi:10.1086/337513

Cited by 9 publications

(4 citation statements)

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“…Fruit growth and elongation are stimulated by auxin (Devoghalaere et al, 2012 ); thus, we predict that genes involved in fruit resupination might include ones involved in auxin biosynthesis. Auxin was previously shown to pass basipetally through the gynostemium to the ovaries of orchid flowers, where it jointly regulates resupination alongside other substances produced by the gynostemium or pollinia (Goh et al, 1982 ; Strauss and Arditti, 1982 ; Nyman et al, 1985 ). In Dendrobium Sw., auxin was associated with post‐pollination events such as fruit formation (Netlak et al, 2022 ).…”

Section: Discussionmentioning

confidence: 99%

“…The orientation of resupinated flowers is 180°, but in some orchid species the flowers can undergo double resupination (360°). In Dendrobium lineale Rolfe, young floral buds often reorient themselves during resupination (Indraloka and Purnobasuki, 2019 ), with the bud making a 180° turn so the labellum faces downwards (Nyman et al, 1984 , 1985 ; Indraloka and Purnobasuki, 2019 ; Netlak et al, 2022 ). By contrast, Angraecum eburneum Bory and Malaxis paludosa flowers experience double resupination as they twist over 360° during development (Ames, 1938 ; Hill, 1939 ; Yam et al, 2009 ).…”

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confidence: 99%

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Orchid fruit and root movement analyzed using 2D photographs and a bioinformatics pipeline for processing sequential 3D scans

Pramanik,

Vaskimo,

Batenburg

et al. 2024

Appl Plant Sci

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PremiseMost studies of the movement of orchid fruits and roots during plant development have focused on morphological observations; however, further genetic analysis is required to understand the molecular mechanisms underlying this phenomenon. A precise tool is required to observe these movements and harvest tissue at the correct position and time for transcriptomics research.MethodsWe utilized three‐dimensional (3D) micro–computed tomography (CT) scans to capture the movement of fast‐growing Erycina pusilla roots, and built an integrated bioinformatics pipeline to process 3D images into 3D time‐lapse videos. To record the movement of slowly developing E. pusilla and Phalaenopsis equestris fruits, two‐dimensional (2D) photographs were used.ResultsThe E. pusilla roots twisted and resupinated multiple times from early development. The first period occurred in the early developmental stage (77–84 days after germination [DAG]) and the subsequent period occurred later in development (140–154 DAG). While E. pusilla fruits twisted 45° from 56–63 days after pollination (DAP), the fruits of P. equestris only began to resupinate a week before dehiscence (133 DAP) and ended a week after dehiscence (161 DAP).DiscussionOur methods revealed that each orchid root and fruit had an independent direction and degree of torsion from the initial to the final position. Our innovative approaches produced detailed spatial and temporal information on the resupination of roots and fruits during orchid development.

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Section: Discussionmentioning

confidence: 99%

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confidence: 99%

Orchid fruit and root movement analyzed using 2D photographs and a bioinformatics pipeline for processing sequential 3D scans

Pramanik,

Vaskimo,

Batenburg

et al. 2024

Appl Plant Sci

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“…corroborated this by crossing wild/resupinate and cultivar/non-resupinate types of Habenaria radiata (Orchidoideae: Habenariinae) and found that intraspecific hybrids had resupinate flowers. At early ontogenetic phases of orchids, the labellum (a modified petal) is adaxial, and becomes lowermost in the perianth prior to anthesis phase or soon after it Nyman et al 1984;Nyman et al 1985;).…”

Section: Introductionmentioning

confidence: 99%

“…The changes in cell reconfiguration are physiologically driven by auxins (Nair & Arditti 1991;. Nyman et al 1985 experimentally demonstrated that the removal of the entire gynostemium from buds, its tips (stigma and pollinia) or even pollinia solely prevents resupination of Dendrobium (Epidendroideae: Dendrobiinae) hybrids. Since the pollinia produces large amounts of indoleacetic acid, this suggested that the mechanism was related to auxins.…”

Section: Introductionmentioning

confidence: 99%

Aspectos reprodutivos de orquídeas em ambientes de Vereda do Cerrado

Cardoso¹

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The Veredas wetlands are unique environments in the Cerrado biome, harboring high diversity and providing important ecosystem services. These environments are particularly diverse in Orchidaceae. In this thesis, we study the reproductive biology of endangered orchids that occur in Veredas wetlands to demonstrate the diversity of processes and the potential for generating knowledge that these environments provide.Cyrtopodium hatschbachii is a species primarily pollinated by bees, but with low fruit set rates, which may even be null in some years. However, we demonstrate in the first chapter how herbivory and rainfall, two factors that are detrimental when considered separately, can together facilitate autogamy and promote reproductive assurance in this species.Phragmipedium vittatum is a lady's slippery orchid that traps pollinators in order to reproduce. In the second chapter, we demonstrate the various strategies that these flowers adopt to enable successful pollination, from pollinator capture, through the intrafloral movements they are forced to make, until pollen transfer during their exit from the flower.To do so, P. vittatum uses an aphid mimicry system that deceives gravid females of Syrphidae dipterans during flower entry and exit, as they are looking for oviposition sites where their aphidophagous larvae will feed on. Using also P. vittatum as model, we found that it is a unique species in the world as it presents intrapopulation variation in floral resupination. This process refers to the twist of approximately 180º that occurs in some flowers before or during anthesis, which makes them upside down. In the third chapter, we show that approximately 10% of the flowers in the population do not resupinate. We experimentally tested the role of resupination in the process of reproduction and found that only flowers with the lip facing downward have male and female reproductive success, when compared to flowers with the lip positioned upward and sideward. These results are important because they corroborate that the evolution of resupination is related 4 to pollination success, with the lip acting as a landing platform or trap and the column facing downward promoting precise pollen deposition. Finally, in the fourth chapter, we demonstrate that the probability of flowers failing to resupinate is negatively related to their weight. This is the first time that flower resupination has been demonstrated as being a weight dependent process. In short, these results show the diversity of life histories that these organisms threatened by extinction can tell us, as well as their potential for generating detailed knowledge. Thus, the conservation of these species and their respective environments is extremely important for the maintenance of such processes and interactions, which are certainly associated with an equilibrated environment that provides several ecosystem services.

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A new species and a new subspecies of Salvia (Lamiaceae) from Jalisco and Michoacán, Mexico

Iltis¹,

González-Gallegos

Cochrane³

et al. 2012

Brittonia

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Resupination in Flowers of Two Dendrobium (Orchidaceae) Hybrids: Effects of Nodal Position and Removal of Floral Segments

Cited by 9 publications

References 4 publications

Orchid fruit and root movement analyzed using 2D photographs and a bioinformatics pipeline for processing sequential 3D scans

Orchid fruit and root movement analyzed using 2D photographs and a bioinformatics pipeline for processing sequential 3D scans

Aspectos reprodutivos de orquídeas em ambientes de Vereda do Cerrado

A new species and a new subspecies of Salvia (Lamiaceae) from Jalisco and Michoacán, Mexico

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