Stamen Diversity in Melastomataceae: Morphology, Color, and Function

Melo, Lílian Rodrigues Ferreira de; Vasconcelos, Thaís; Caetano, Ana Paula Souza; Brito, Vinícius Lourenço Garcia de

doi:10.1007/978-3-030-99742-7_27

Cited by 6 publications

(6 citation statements)

References 90 publications

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“…Goldenberg y Shepherd (1998) al estudiar la morfología floral de Miconia y Leandra, muestran que en Miconia con frecuencia ocurren flores pequeñas que no superan los 5 mm, al igual que Manrique et al (2022), autores que señalan que las flores de M. elaeoides en promedio tienen una longitud total de 10.97 mm (incluye estambres) y en M. cataractae de 9.61 mm, además, los pétalos de M. elaeoides presentan longitudes alrededor de los 3 mm, similares a las registradas en este estudio. Los resultados obtenidos corroboran que las especies estudiadas tienen anteras cortas con poros grandes, propias de la sección Cremanium, las cuales han sido relacionadas con polinización generalizada, ya que, poros grandes facilitan la extracción de polen a insectos no vibratorios en zonas altas donde las abejas no son muy abundantes (Manrique et al, 2022;Melo et al, 2022).…”

Section: Discussionunclassified

Feno-morfología de dos especies de páramo de Miconia (Melastomataceae): optimización de la floración y fructificación para mejorar la dispersión

et al. 2022

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Introducción: El Páramo es de los ecosistemas más afectados por actividades humanas, lo que aumenta la necesidad de estudios fenológicos como base para el manejo y la conservación. Objetivo: Describir la feno-morfología de Miconia ligustrina y Miconia elaeoides. Métodos: De septiembre 2019 a febrero 2020, y de abril 2021 hasta agosto del mismo año, se monitoreó la fenología de 12 individuos de cada especie. Adicionalmente, se vincularon datos fenológicos de ejemplares de herbario, para corroborar los resultados obtenidos. En los dos conjuntos de datos, se describió su distribución usando estadística circular, además, se obtuvieron registros de precipitación y temperatura del área. Adicionalmente, se describió la morfometría de cada especie. Resultados: El pico de floración de M. lingustrina es en abril, y la fructificación se concentra entre junio y julio; M. elaoides, florece de forma masiva en enero, con la máxima producción de frutos en mayo. Hubo correlación entre fenología y lluvias: la floración se da en época seca y la fructificación en la época lluviosa. Las especies difieren en morfología, pero, como en otras especies de Miconia, las flores y frutos son pequeños (aprox. 5 mm). Conclusión: La floración se presenta en la época seca y la fructificación en la época lluviosa, cuando las tasas de fotosíntesis son bajas y la frugivoría incrementa. Este patrón fenológico favorece la dispersión óptima de semillas.

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Section: Discussionunclassified

Feno-morfología de dos especies de páramo de Miconia (Melastomataceae): optimización de la floración y fructificación para mejorar la dispersión

et al. 2022

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“…In buzz-pollinated flowers with poricidal anthers, pollen cannot provide any signal, but the anthers do (Vallejo-Marin & Russell 2023). The conspicuous appendages of the feeding stamens in heterantherous Melastomataceae flowers represent an example of the signalling feeding stamens as opposed to the cryptic pollination stamens (Melo et al 2022). General visual cues of pollen and stamen signals serve as models in this mimicry system Velloso et al 2018).…”

Section: Heterantherous Flowersmentioning

confidence: 99%

“…The conspicuous appendages of the feeding stamens in heterantherous Melastomataceae flowers represent an example of the signalling feeding stamens as opposed to the cryptic pollination stamens (Melo et al . 2022). General visual cues of pollen and stamen signals serve as models in this mimicry system (Lunau & Wester 2017; Velloso et al .…”

Section: Pasam As a Multi‐facetted Phenomenon And Beyondmentioning

confidence: 99%

Pollen, anther, stamen, and androecium mimicry

Lunau,

De Camargo,

Brito

2024

Plant Biol J

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Floral colours represent a highly diverse communication signal mainly involved in flower visitors' attraction and guidance, but also flower discrimination, filtering non‐pollinators and discouraging floral antagonists. The divergent visual systems and colour preferences of flower visitors, as well as the necessity of cues for flower detection and discrimination, foster the diversity of floral colours and colour patterns. Despite the bewildering diversity of floral colour patterns, a recurrent component is a yellow UV‐absorbing floral centre, and it is still not clear why this pattern is so frequent in angiosperms. The pollen, anther, stamen, and androecium mimicry (PASAM) hypothesis suggests that the system composed of the flowers possessing such yellow UV‐absorbing floral reproductive structures, the flowers displaying central yellow UV‐absorbing structures as floral guides, and the pollen‐collecting, as well as pollen‐eating, flower visitors responding to such signals constitute the world's most speciose mimicry system. In this review, we call the attention of researchers to some hypothetical PASAM systems around the globe, presenting some fascinating examples that illustrate their huge diversity. We will also present new and published data on pollen‐eating and pollen‐collecting pollinators' responses to PASAM structures supporting the PASAM hypothesis and will discuss how widespread these systems are around the globe. Ultimately, our goal is to promote the idea that PASAM is a plausible first approach to understanding floral colour patterns in angiosperms.

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“…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).…”

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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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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Stamen Diversity in Melastomataceae: Morphology, Color, and Function

Cited by 6 publications

References 90 publications

Feno-morfología de dos especies de páramo de Miconia (Melastomataceae): optimización de la floración y fructificación para mejorar la dispersión

Feno-morfología de dos especies de páramo de Miconia (Melastomataceae): optimización de la floración y fructificación para mejorar la dispersión

Pollen, anther, stamen, and androecium mimicry

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

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