Floral heterochrony promotes flexibility of reproductive strategies in the morphologically homogeneous genus Eugenia (Myrtaceae)

Vasconcelos, Thaís; Lucas, Eve; Faria, Jair Eustáquio Quintino; Prenner, Gerhard

doi:10.1093/aob/mcx142

Cited by 29 publications

(13 citation statements)

References 63 publications

(69 reference statements)

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“…In Myrcianthes, fallen bracteoles sometimes leave prominent auricle-like scars (Grifo, 1992). Vasconcelos & al. (2018) demonstrate that the style of E. sect.…”

Section: Resultsmentioning

confidence: 99%

“…-Flowers in the exceptionally species-rich E. sect. Umbellatae clade appear to uniquely and exclusively possess a style that is approximately twice as long as the stamens (Vasconcelos & al., 2018). Morphological patterns within E. sect.…”

Section: Resultsmentioning

confidence: 99%

“…(2017), all three studies show all Old World species of Eugenia as a monophyletic group. In a recent study, Vasconcelos & al. (2018) provide an overview of flower development in Eugenia, including discussion of variation in perianth growth rate, style gigantism in E. sect.…”

Section: Introductionmentioning

confidence: 93%

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Phylogeny and biogeography of the hyper–diverse genus Eugenia (Myrtaceae: Myrteae), with emphasis on E. sect. Umbellatae, the most unmanageable clade

Mazine

Faria

Giaretta

et al. 2018

TAXON

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Eugenia, comprising ca. 1100 species, is the largest genus of Neotropical Myrtaceae. Eugenia sect. Umbellatae (formerly referred to as “clade 9”) is the most speciose lineage of Eugenia. This study aims to better delimit E. sect. Umbellatae, to identify and understand relationships between manageable subgroups of this large clade for future discrete systematic studies and to explain biogeographical patterns in the genus. In total, 103 samples were used in this study. These include representatives of the nine clades of the “Eugenia group” with a particular focus on Eugenia clade 9, representing the morphological and geographical diversity found in the genus. Phylogenetic reconstructions were performed using maximum likelihood (ML) and Bayesian inference (BI) for the combined dataset, using the markers ITS, rpl16, psbA–trnH, rpl32–trnL, trnQ–rps16. The resultant tree was fossil calibrated and used for historical biogeographical analysis using DEC implemented in RASP. The mid Oligocene is the most likely period in which the crown node of Eugenia s.l. diversified. The earliest Eugenia appear to be associated with dry biomes and to have arisen from non–tropical southern South America, as did ancestors of the earliest American Myrteae. Eugenia subg. Pseudeugenia also most likely diversified in dry biomes, while E. subg. Hexachlamys and E. subg. Eugenia are likely to have diverged in the Atlantic Forests biome. Eugenia sect. Umbellatae is morphologically very variable; some clades can be circumscribed based on morphology while some remain morphologically undiagnosable. The study presented here provides discussion of the earliest origins of Eugenia and its response to climate–driven changes in the Neotropics as humid, forest biomes became more widespread in the Miocene. In addition, important practical conclusions are drawn regarding relationships within Eugenia. Three clades are newly classified as subgenera: E. subg. Pseudeugenia (including species of E. sect. Pseudeugenia); E. subg. Hexachlamys (including E. sect. Hexachlamys) and E. subg. Eugenia (including E. sect. Umbellatae,E. sect. Jossinia,E. sect. Phyllocalyx,E. sect. Pilothecium,E. sect. Racemosae,E. sect. Schizocalomyrtus, E. sect. Speciosae and Eugenia sect. Excelsae). Two previously unidentified clades are published as E. sect. Excelsae and recognized as E. sect. Jossinia, the latter consisting entirely of Old World species.

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“…In Myrcianthes, fallen bracteoles sometimes leave prominent auricle-like scars (Grifo, 1992). Vasconcelos & al. (2018) demonstrate that the style of E. sect.…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Phylogeny and biogeography of the hyper–diverse genus Eugenia (Myrtaceae: Myrteae), with emphasis on E. sect. Umbellatae, the most unmanageable clade

Mazine

Faria

Giaretta

et al. 2018

TAXON

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“…Recently, Ronse de Craene (2018) emphasized the importance of heterochrony in three developmental processes: phyllotaxis, the development of common stamen-petal primordia and obdiplostemony, linking changes in the growth rate with delayed organ initiation. Heterochronic growth rates of the perianth and style, and early hypanthium elongation, are responsible for the great species diversity within the morphologically homogeneous Eugenia genus ( Vasconcelos et al, 2018 ). Finally, heterochronic expression of the fw2.2 allele, which affects cell division in early fruit development, is responsible for natural variation in tomato fruit size ( Cong et al, 2002 ).…”

Section: Heterochrony In the Evolution And Diversification Of Plantsmentioning

confidence: 99%

The Times They Are A-Changin’: Heterochrony in Plant Development and Evolution

Buendía-Monreal

Gillmor

2018

Front. Plant Sci.

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Alterations in the timing of developmental programs during evolution, that lead to changes in the shape, or size of organs, are known as heterochrony. Heterochrony has been widely studied in animals, but has often been neglected in plants. During plant evolution, heterochronic shifts have played a key role in the origin and diversification of leaves, roots, flowers, and fruits. Heterochrony that results in a juvenile or simpler outcome is known as paedomorphosis, while an adult or more complex outcome is called peramorphosis. Mechanisms that alter developmental timing at the cellular level affect cell proliferation or differentiation, while those acting at the tissue or organismal level change endogenous aging pathways, morphogen signaling, and metabolism. We believe that wider consideration of heterochrony in the context of evolution will contribute to a better understanding of plant development.

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“…Contrary to expectation, however, it is notable that a large number of angiosperm lineages have apparently uniform floral morphologies. This trend includes species‐rich lineages of woody plants such as Myrcia , Eugenia (Myrtaceae; Vasconcelos et al ., ), Croton (Euphorbiaceae; Webster, ), Mimosa (Fabaceae; Barneby, ), Solanum (Solanaceae; Symon, ), some Malpighiaceae (Anderson, ), Sapotaceae (Chartier et al ., ) and Miconia (Melastomataceae; Renner, ), to cite just a few. These groups are crucial components of the woody tropical flora in both abundance and diversity of species (e.g.…”

Section: Introductionmentioning

confidence: 99%

Floral uniformity through evolutionary time in a species‐rich tree lineage

et al. 2018

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Changes in floral morphology are expected across evolutionary time and are often promoted as important drivers in angiosperm diversification. Such a statement, however, is in contrast to empirical observations of species-rich lineages that show apparent conservative floral morphologies even under strong selective pressure to change from their environments.Here, we provide quantitative evidence for prolific speciation despite uniform floral morphology in a tropical species-rich tree lineage. We analyse floral disparity in the environmental and phylogenetic context of Myrcia (Myrtaceae), one of the most diverse and abundant tree genera in Neotropical biomes.Variation in floral morphology among Myrcia clades is exceptionally low, even among distantly related species. Discrete floral specialisations do occur, but these are few, present low phylogenetic signal, have no strong correlation with abiotic factors, and do not affect overall macroevolutionary dynamics in the lineage.Results show that floral form and function may be conserved over large evolutionary time scales even in environments full of opportunities for ecological interactions and niche specialisation. Species accumulation in diverse lineages with uniform flowers apparently does not result from shifts in pollination strategies, but from speciation mechanisms that involve other, nonfloral plant traits.

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Floral heterochrony promotes flexibility of reproductive strategies in the morphologically homogeneous genus Eugenia (Myrtaceae)

Cited by 29 publications

References 63 publications

Phylogeny and biogeography of the hyper–diverse genus Eugenia (Myrtaceae: Myrteae), with emphasis on E. sect. Umbellatae, the most unmanageable clade

Phylogeny and biogeography of the hyper–diverse genus Eugenia (Myrtaceae: Myrteae), with emphasis on E. sect. Umbellatae, the most unmanageable clade

The Times They Are A-Changin’: Heterochrony in Plant Development and Evolution

Floral uniformity through evolutionary time in a species‐rich tree lineage

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