Ontogeny and Evolution of the Hyperorgan of Delphinieae

Jabbour, Florian; Zalko, Julie; Morel, Antoine; Frachon, Samuel; Bouchart-Dufay, Isabelle

doi:10.1002/9781119476870.ch9

Cited by 2 publications

(5 citation statements)

References 23 publications

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“…At anthesis, the two lateral petals are flat, whereas the two dorsalmost petals are spurred (Figure 2) and nested within the hollow sepal. The nectariferous tissue is located all along the inner epidermis of the spur (Zalko et al, 2021). Floral buds of Staphisagria picta were collected at 10 successive developmental stages, from stage 01 (bud sampled after the resumption of development, the petal is flat) to stage 10 (mature petal).…”

Section: Plant Materialsmentioning

confidence: 99%

“…The copyright holder for this preprint (which this version posted July 22, 2023. ; https://doi.org/10.1101/2023.07.20.549858 doi: bioRxiv preprint are spurred and nectariferous. These petals are nested within the spurred sepal (Jabbour and Renner, 2012b), and their morphology (Figure 2) and development have been extensively studied (Jabbour et al, 2009;Chartier et al, 2016;Chen et al, 2018;Jabbour et al, 2021). It is a case of synorganization, that is to say the intimate structural connection of two or more neighbouring floral organs forming a functional system (i.e., a hyperorgan) (Specht and Bartlett, 2009;Jabbour et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

“…These petals are nested within the spurred sepal (Jabbour and Renner, 2012b), and their morphology (Figure 2) and development have been extensively studied (Jabbour et al, 2009;Chartier et al, 2016;Chen et al, 2018;Jabbour et al, 2021). It is a case of synorganization, that is to say the intimate structural connection of two or more neighbouring floral organs forming a functional system (i.e., a hyperorgan) (Specht and Bartlett, 2009;Jabbour et al, 2021). The length of the inner spurs determines the range of pollinators able to collect nectar.…”

Section: Introductionmentioning

confidence: 99%

“…The genus Staphisagria is sister to the remaining Delphinieae and includes two species, namely S. picta and S. macrosperma (Léotard, 2002;Jabbour and Renner, 2011). This genus was used to describe the development and structure of the nectariferous hyperorgan (Jabbour et al, 2021). A depression is initiated at the primordium stage, deepens, and eventually forms a curved spur (Zalko et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

“…This genus was used to describe the development and structure of the nectariferous hyperorgan (Jabbour et al, 2021). A depression is initiated at the primordium stage, deepens, and eventually forms a curved spur (Zalko et al, 2021). However, the cellular mechanisms involved -in terms of localization and duration of cell proliferation and expansion -remain undescribed.…”

Section: Introductionmentioning

confidence: 99%

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Three-dimensional study of spur morphogenesis in the flower ofStaphisagria picta(Ranunculaceae) – from cellular level to organ scale

Delpeuch

Nadot

Belcram

et al. 2023

Preprint

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Floral spurs are invaginations borne by perianth organs (petals and/or sepals) that have evolved repeatedly in various angiosperm clades. They typically store nectar and can limit the access of pollinators to this reward, resulting in pollination specialization that can lead to speciation in both pollinator and plant lineages. Despite the ecological and evolutionary importance of nectar spurs, the cellular mechanisms involved during spur development have only been described in detail in a handful of species, primarily with respect to epidermal cells. These studies show that the mechanisms involved are taxon-specific. Using confocal microscopy and automated 3D image analysis, we studied spur morphogenesis in Staphisagria picta (Ranunculaceae) and showed that the process is marked by an early phase of dominant cell proliferation, followed by a phase of anisotropic (directional) cell expansion. The comparison with Aquilegia, another taxon of Ranunculaceae with spurred petals, revealed that the convergence in form between the spurs of both taxa is obtained by partially similar developmental processes. The analytical pipeline designed here is an efficient method to visualize in 3D each cell of a developing organ, paving the way for future comparative studies of organ morphogenesis in multicellular eukaryotes.

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Section: Plant Materialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Three-dimensional study of spur morphogenesis in the flower ofStaphisagria picta(Ranunculaceae) – from cellular level to organ scale

Delpeuch

Nadot

Belcram

et al. 2023

Preprint

Self Cite

View full text Add to dashboard Cite

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Delphinium as a model for development and evolution of complex zygomorphic flowers

Sharma,

Pandher,

Alcaraz Echeveste

et al. 2024

Front. Plant Sci.

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The complex zygomorphic flowers of the early-diverging eudicot Delphinium provide an opportunity to explore intriguing evolutionary, developmental, and genetic questions. The dorsal perianth organs, consisting of a spurred sepal and the nectar-bearing spurred petal(s) in Delphinium, contribute to the dorso-ventralization and zygomorphic flower morphology. The seamless integration of the two or three dorsal petaloid spurred organs is considered a synorganization, and the resulting organ complex is referred to as a hyperorgan. The hyperorgan shows variability within the tribe due to variation in the number, size, and shape of the spurs. Research in recent decades within this tribe has enhanced our understanding of morphological evolution of flowers. More recently, functional studies using the RNAi approach of Virus-Induced Gene Silencing (VIGS) have unraveled interesting results highlighting the role of gene duplication in the functional diversification of organ identity and symmetry genes. Research in this early-diverging eudicot genus bridges the gaps in understanding the morphological innovations that are mostly studied in model grass and core eudicot clades. This first comprehensive review synthesizes eco-evo-devo research on Delphinium, developing a holistic understanding of recent advancements and establishing the genus as an exceptional model for addressing fundamental questions in developmental genetics, particularly in the evolution of complex flowers. This progress highlights Delphinium’s significant potential for future studies in this field.

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Ontogeny and Evolution of the Hyperorgan of Delphinieae

Cited by 2 publications

References 23 publications

Three-dimensional study of spur morphogenesis in the flower ofStaphisagria picta(Ranunculaceae) – from cellular level to organ scale

Three-dimensional study of spur morphogenesis in the flower ofStaphisagria picta(Ranunculaceae) – from cellular level to organ scale

Delphinium as a model for development and evolution of complex zygomorphic flowers

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