The ontogenetic bases for variation in ovary position in Melastomataceae

Basso-Alves, João Paulo; Goldenberg, Renato; Teixeira, Simone de Pádua

doi:10.3732/ajb.1700114

Cited by 14 publications

(9 citation statements)

References 78 publications

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“…However, this correlation does not seem to be valid for several cases, such as Melastomataceae Juss. [ 39 ] or Rosaceae [ 40 ]. In Rhamnaceae, more flattened floral apices may form semi-inferior ovaries (e.g., Colubrina glandulosa , Paliurus spina-christi Mill.…”

Section: Discussionmentioning

confidence: 99%

“…Thus, plasticity in the development of the gynoecial hypanthium must be an inherent feature of Rhamnaceae. Ovary position tends to be a stable characteristic within angiosperm families, but several groups show similar disparity, such as Melastomataceae [ 39 ] and Saxifragaceae [ 41 ]. However, in rhamnoids, several genera have a superior ovary [ 5 ], and there are few cases of an inferior ovary (e.g., Fenghwaia [ 22 ]).…”

Section: Discussionmentioning

confidence: 99%

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Floral Development of Rhamnaceae and Origin of Its Unique Floral Features

Basso-Alves¹,

Ribeiro²,

Teixeira³

2023

Plants

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Rhamnaceae flowers have a peculiar morphology, including keeled sepals, one stamen whorl closely related to the petals, and a broad perigynous hypanthium that supports a voluminous nectary. In the present investigation, we detailed the flower development of five Rhamnaceae species to understand the origin of such specific floral characteristics. Floral buds and flowers were processed for surface and histological analyses. The sepals emerge in sequential order and the other organs in simultaneous order. The development of the perigynous hypanthium renders the floral apex broad and concave. The sepals undergo abaxial thickening early on, forming a keel and strongly influencing the floral merosity. Petals and stamens appear close to each other on the same radius in a very short plastochron. The carpels unite soon after their emergence, forming a syncarpous ovary and free style branches. Differences in intercalary carpel growth promote the formation of inferior (Gouania virgata) and semi-inferior ovaries (Colubrina glandulosa, Hovenia dulcis, and Sarcomphalus joazeiro). Rhamnidium elaeocarpum does not undergo such growth, and the resulting ovary is superior. The keeled sepals promote the isolation of the petal–stamen pair inside the flower bud. The possibility of a common primordium that the originates petal and stamen is refuted. Comparisons with other Rosales families provide insights into the floral origin and diversification of Rhamnaceae.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Floral Development of Rhamnaceae and Origin of Its Unique Floral Features

Basso-Alves¹,

Ribeiro²,

Teixeira³

2023

Plants

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“…Studies on the variation in the position of the ovary in some species of Melastomataceae showed that some functional implications may occur, but still are poorly understood (BASSO-ALVES et al, 2017). According to these authors, these implications could be related to the protection of the ovules (greater for the lower ovaries), protection against pollinators that can damage the flowers (hummingbirds, for example) and the type of fruit.…”

Section: Hypanthium and Perianthmentioning

confidence: 99%

Some remarks on the taxonomic significance of the floral structure in several Miconia (Melastomataceae) species

Gonçales,

Martarelli,

Dos Santos

et al. 2023

Cuad. Ed. Desar.

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The structural features of vegetative organs have been used in the identification of species de Miconia, Melastomataceae, but the data available are inconsistent because they are commonly subject to environmental variations. In the present work we have attempted to point out floral characters that can be employed in the taxonomy of the genus. Floral buds and flowers were obtained from herbarium vouchers, and plants that occur in natural environments of Brazilian state parks, embedded in historesin, and analyzed in light microscope. Flowers consist of perianth with homogeneous parenchymatous mesophyll, the inferior or semi-inferior ovary with collenchyma and/or parenchyma, anatropous or hemi-anatropous ovules, a single strand of transmitting tissue in the style, hypanthium with collenchyma and parenchyma, and poricidal anthers. Associated floral characters have value at the specific level, viz. perigynous hypanthium structure, filament structure, anther type, ovary position and number of carpels/locules, placentation, wall of the inferior ovary, vascular supply of the ovary, ovule type, and style structure. These structural characteristics of the flower can be useful at the specific and generic level.

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“…ex Roth (Lammers, 2007). e inferior ovary is considered a derived character state; however, there were revealed certain cases of reversals from an inferior state to a semi-inferior or superior state (Basso-Alves et al, 2017;Rudall, 2002;Soltis & Hufford, 2002). In this connection, the semi-inferior ovary insertion in Campanuloideae still needs to be properly evaluated as ancestral or derived condition.…”

Section: Morphological Structure Of Fruit and Adaptations To Dehiscencementioning

confidence: 99%

Morpho-Anatomy of the Gynoecium and Fruit in Three Ornamental Members of Campanuloideae (Campanulaceae)

Andreychuk

Odintsova

2021

Acta Agrobot

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Gynoecium and fruit micromorphology and anatomy were studied using light microscopy in three species of Campanuloideae belonging to the tribes Cyanantheae ( Platycodon grandiflorus ), Wahlenbergieae ( Jasione montana ), and Campanuleae ( Adenophora liliifolia ) of the native and cultivated flora of Ukraine, to elucidate structural adaptations for fruit dehiscence. The studied species differed in flower/fruit orientation, carpel number, ovary insertion, and capsule-opening position, and the information provided a background for the discovery of common anatomical features influencing fruit dehiscence. In the studied species, the synascidiate and symplicate zones in the ovary and prominent placentae were found to be located near the mid-region of the ovary. The distinct innervation of the ovary wall and ovules was described. In P. grandiflorus , the septa and fruit wall contained a lignified parenchyma in a subepidermal position, while in J. montana and A. liliifolia , lignification was observed only in proximal portions of the septa, above the placenta ( J. montana ), or was noted as a narrow strand from the ovary base to the mid-region, called “axicorn” ( A. liliifolia ). In all the studied species, unlignified endocarpium was detected. The semi-inferior capsule of P. grandiflorus has been defined as a capsule of the Forsythia -type, with a sclerenchymatous layer in the inner zone of the mesocarpium. In J. montana and A. liliifolia , a new histogenetic type of capsule is described as Campanula -type, without lignified layers in the fruit wall and with lignified tissue in the septa, which enabled dehiscence. Our study proposed for the first time the classification of the capsules found in the studied species based on the development of openings in the superior or inferior regions of the fruits. The upright fruits of P. grandiflorus and J. montana reveal incomplete dorsiventral dehiscence in the superior region of the fruit, while dehiscence of pendent fruits of A. liliifolia is hippocrepiform-septifragal interlocular and occurs in the inferior region of the fruit at its base, as revealed previously in Campanula latifolia fruit.

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The ontogenetic bases for variation in ovary position in Melastomataceae

Cited by 14 publications

References 78 publications

Floral Development of Rhamnaceae and Origin of Its Unique Floral Features

Floral Development of Rhamnaceae and Origin of Its Unique Floral Features

Some remarks on the taxonomic significance of the floral structure in several Miconia (Melastomataceae) species

Morpho-Anatomy of the Gynoecium and Fruit in Three Ornamental Members of Campanuloideae (Campanulaceae)

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