Contributions to the floral anatomy of Juncaceae (Poales – Monocotyledons)

Oriani, Aline; Stützel, Thomas; Scatena, Vera Lúcia

doi:10.1016/j.flora.2012.03.001

Cited by 19 publications

(6 citation statements)

References 38 publications

(63 reference statements)

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“…In Juncaceae, the obturator corresponds to trichomes that originate from the placenta (Oriani et al 2012), while in Cyperaceae the obturator is a papillose outgrowth with funicular origin (Goetghebeur 1998;Coan et al 2008). The occurrence of an obturator in Mayacaceae is first reported here and corresponds to a modification of the pollen tube transmitting tissue, which protrudes into the locule in the apex of the ovary and exhibits secretory activity.…”

Section: Discussionmentioning

confidence: 77%

“…The presence of papillose epidermal cells on the petals is probably another floral attribute that serves as an attractant to pollinators. The total reduction of the inner whorl of stamens also occurs in representatives of Juncaceae (Oriani et al 2012) and Cyperaceae (Goetghebeur 1998;Vrijdaghs et al 2005), linking Mayacaceae to the cyperids. The phylogenetic proximity between the Mayacaceae, Juncaceae, and Cyperaceae that is suggested in this study corroborates the findings of phylogenetic analyses of Poales in which Mayacaceae appears as a sister group to the cyperid clade (Chase et al 2000;Christin et al 2008).…”

Section: Discussionmentioning

confidence: 98%

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Floral Anatomy of Xyrids (Poales): Contributions to Their Reproductive Biology, Taxonomy, and Phylogeny

Oriani

Scatena

2012

International Journal of Plant Sciences

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JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.. Xyridaceae, Eriocaulaceae, and Mayacaceae form the xyrid clade, which is weakly supported in Poales. The floral anatomy of xyrid species was studied, to contribute to the understanding of the relationships within the group. Both Eriocaulaceae and Xyridaceae have petals with elongated epidermal cells with straight walls, epipetalous stamens, staminodes, anthers with longitudinal dehiscence, an endothecium with band-like thickenings, and a style vascularized by the dorsal carpellary bundles; these characteristics thus corroborate the close relationship of these groups indicated by phylogenetic analyses. Mayacaceae is distinguished by the presence of papillose epidermal cells in the petals, a reduced inner whorl of stamens, poricidal anthers, an endothecium lacking thickenings, a style and stigma vascularized by the dorsal and ventral carpellary bundles, and the presence of an obturator in the ovary wall. A reduction in the inner whorl of fertile stamens also occurs in Juncaceae and Cyperaceae, linking Mayacaceae to the cyperids. The stylar appendages of Orectanthe (Xyridaceae) have been shown to be nectariferous and anatomically similar to those of Abolboda, differentiating these two genera from Xyris (Xyridoideae) and confirming their placement in Abolbodoideae. Stylar appendages also occur in Eriocaulaceae, with the same function, position, and vascularization, and are therefore homologous structures, reinforcing the phylogenetic proximity between Eriocaulaceae and Xyridaceae.

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Section: Discussionmentioning

confidence: 77%

Section: Discussionmentioning

confidence: 98%

Floral Anatomy of Xyrids (Poales): Contributions to Their Reproductive Biology, Taxonomy, and Phylogeny

Oriani

Scatena

2012

International Journal of Plant Sciences

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“…The obturator in Nyctaginaceae serves as a bridge between the stylar transmitting tissue and micropyle; it is putatively involved either in nutrition or in driving pollen‐tube growth (physically and/or chemically), as reported in other distantly related taxa (Maheshwari, 1950; Tilton and Horner, 1980; Herrero, 2000; Oriani et al, 2012). For example, the obturator in soybean controls the direction of pollen‐tube growth by secreting chemostatic exudates (Tilton et al, 1984).…”

Section: Discussionmentioning

confidence: 99%

Contrasting models of the female reproductive tract in four o'clocks (Nyctaginaceae)

Nores

López

Antón

et al. 2015

American J of Botany

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We propose two models of female reproductive tract, (A) one in which an obturator is absent and the transmitting tissue is compact and branched and (B) one in which an obturator is present and the transmitting tissue is diffuse. On the basis of character optimization, we hypothesize that model B represents the ancestral (plesiomorphic) condition in the family and model A originated once during evolution, within the tribe Nyctagineae.

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“…Among Poales other than Eriocaulaceae, a gynophore occurs in flowers of Juncaceae and some Cyperaceae [60][61][62][63]. Elaborated gynophores forming a lobed cup below the gynoecium are known in Cyperaceae [60].…”

Section: Discussionmentioning

confidence: 99%

Stability Despite Reduction: Flower Structure, Patterns of Receptacle Elongation and Organ Fusion in Eriocaulon (Eriocaulaceae: Poales)

Sokoloff

Yadav

Chandore³

et al. 2020

Plants

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Eriocaulaceae (Poales) differ from potentially related Xyridaceae in pattern of floral organ arrangement relative to subtending bract (with median sepal adaxial). Some Eriocaulaceae possess reduced and non-trimerous perianth, but developmental data are insufficient. We conducted a SEM investigation of flower development in three species of Eriocaulon to understand whether organ number and arrangement are stable in E. redactum, a species with a highly reduced calyx and reportedly missing corolla. Early flower development is similar in all three species. Male and female flowers are indistinguishable at early stages. Despite earlier reports, both floral types uniformly possess three congenitally united sepals and three petals in E. redactum. Petals and inner stamens develop from common primordia. We assume that scanning electron microscopy should be used in taxonomic accounts of Eriocaulon to assess organ number and arrangement. Two types of corolla reduction are found in Eriocaulaceae: suppression and complete loss of petals. Common petal–stamen primordia in Eriocaulon do not co-occur with delayed receptacle expansion as in other monocots but are associated with retarded petal growth. The ‘reverse’ flower orientation of Eriocaulon is probably due to strictly transversal lateral sepals. Gynoecium development indicates similarities of Eriocaulaceae with restiids and graminids rather than with Xyridaceae.

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Contributions to the floral anatomy of Juncaceae (Poales – Monocotyledons)

Cited by 19 publications

References 38 publications

Floral Anatomy of Xyrids (Poales): Contributions to Their Reproductive Biology, Taxonomy, and Phylogeny

Floral Anatomy of Xyrids (Poales): Contributions to Their Reproductive Biology, Taxonomy, and Phylogeny

Contrasting models of the female reproductive tract in four o'clocks (Nyctaginaceae)

Stability Despite Reduction: Flower Structure, Patterns of Receptacle Elongation and Organ Fusion in Eriocaulon (Eriocaulaceae: Poales)

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