A Comparative Approach to Floral Ontogeny in Melastomataceae

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

doi:10.1007/978-3-030-99742-7_22

Cited by 2 publications

(2 citation statements)

References 76 publications

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“…We emphasize that this landmark placement represents a relaxed interpretation of homology and focuses on recognizable geometric structures that are repeated across flowers. Melastomataceae flowers are whorled, with all organs of one whorl (e.g., all petals, outer stamens, inner stamens) forming at more or less the same time during ontogenesis and genetically having the same floral organ identity (Basso‐Alves and Teixeira, 2022). While petals and stamens are thus generally homologous, we cannot determine exactly which petal is petal number one across flowers.…”

Section: Methodsmentioning

confidence: 99%

“…Finally, corresponding to the hypothesis of strong selection mediated through male fitness, macroevolutionary analyses of Melastomataceae flowers have identified the androecium as most disparate floral organ (Dellinger et al, 2019a;Melo et al, 2022), which may evolve relatively independently from the rest of the flower in response to pollinator-mediated selection (high modularity; Dellinger et al, 2019c). Functional assessments of this androecial diversity are still scarce, but indicate that differentiation in stamen structural properties has strong effects on pollen release dynamics (Bochorny et al, 2021). It is thus likely that (micro-) morphological adaptations in stamens, in addition to overall floral shape, contribute to fitness and specialization in these large, buzz-pollinated flowers.…”

Section: Evolution Of Complex Buzz-flower Morphologiesmentioning

confidence: 99%

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Using geometric morphometrics to determine the “fittest” floral shape: A case study in large‐flowered, buzz‐pollinated Meriania hernandoi

Dellinger,

Hanusch,

Oswald

et al. 2023

American J of Botany

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Premise: Floral shape (relative arrangement and position of floral organs) is critical in mediating fit with pollinators and maximizing conspecific pollen transfer particularly in functionally specialized systems. To date, however, few studies have attempted to quantify flowers as the inherently three-dimensional (3D) structures they are and determine the effect of intraspecific shape variation on pollen transfer. We here addressed this research gap using a functionally specialized system, buzz pollination, in which bees extract pollen through vibrations, as a model. Our study species, Meriania hernandoi (Melastomataceae), undergoes a floral shape change from pseudocampanulate corollas with more actinomorphically arranged stamens (first day) to open corollas with a more zygomorphic androecium (second day) over anthesis, providing a natural experiment to test how variation in floral shape affects pollination performance. Methods: In one population of M. hernandoi, we bagged 51 pre-anthetic flowers and exposed half of them to bee pollinators when they were in either stage of their shape transition. We then collected flowers, obtained 3D flower models through x-ray computed tomography for 3D geometric morphometric analyses, and counted the pollen grains remaining per stamen (male pollination performance) and stigmatic pollen loads (female pollination performance). Results: Male pollination performance was significantly higher in open flowers with zygomorphic androecia than in pseudo-campanulate flowers. Female pollination performance did not differ among floral shapes. Conclusions: These results suggest that there is an "optimal" shape for male pollination performance, while the movement of bees around the flower when buzzing the spread-out stamens results in sufficient pollen deposition regardless of floral shape.

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Section: Methodsmentioning

confidence: 99%

Section: Evolution Of Complex Buzz-flower Morphologiesmentioning

confidence: 99%

Using geometric morphometrics to determine the “fittest” floral shape: A case study in large‐flowered, buzz‐pollinated Meriania hernandoi

Dellinger,

Hanusch,

Oswald

et al. 2023

American J of Botany

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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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A Comparative Approach to Floral Ontogeny in Melastomataceae

Cited by 2 publications

References 76 publications

Using geometric morphometrics to determine the “fittest” floral shape: A case study in large‐flowered, buzz‐pollinated Meriania hernandoi

Using geometric morphometrics to determine the “fittest” floral shape: A case study in large‐flowered, buzz‐pollinated Meriania hernandoi

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

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