Dataset Information

Corolla morphology influences diversification rates in bifid toadflaxes (Linaria sect. Versicolores).

ABSTRACT:

Background and aims

The role of flower specialization in plant speciation and evolution remains controversial. In this study the evolution of flower traits restricting access to pollinators was analysed in the bifid toadflaxes (Linaria sect. Versicolores), a monophyletic group of ~30 species and subspecies with highly specialized corollas.

Methods

A time-calibrated phylogeny based on both nuclear and plastid DNA sequences was obtained using a coalescent-based method, and flower morphology was characterized by means of morphometric analyses. Directional trends in flower shape evolution and trait-dependent diversification rates were jointly analysed using recently developed methods, and morphological shifts were reconstructed along the phylogeny. Pollinator surveys were conducted for a representative sample of species.

Key results

A restrictive character state (narrow corolla tube) was reconstructed in the most recent common ancestor of Linaria sect. Versicolores. After its early loss in the most species-rich clade, this character state has been convergently reacquired in multiple lineages of this clade in recent times, yet it seems to have exerted a negative influence on diversification rates. Comparative analyses and pollinator surveys suggest that the narrow- and broad-tubed flowers are evolutionary optima representing divergent strategies of pollen placement on nectar-feeding insects.

Conclusions

The results confirm that different forms of floral specialization can lead to dissimilar evolutionary success in terms of diversification. It is additionally suggested that opposing individual-level and species-level selection pressures may have driven the evolution of pollinator-restrictive traits in bifid toadflaxes.

SUBMITTER: Fernandez-Mazuecos M

PROVIDER: S-EPMC3838546 | biostudies-literature | 2013 Dec

REPOSITORIES: biostudies-literature

ACCESS DATA

Publications

Corolla morphology influences diversification rates in bifid toadflaxes (Linaria sect. Versicolores).

Fernández-Mazuecos Mario M Blanco-Pastor José Luis JL Gómez José M JM Vargas Pablo P

Annals of botany 20131018 9

<h4>Background and aims</h4>The role of flower specialization in plant speciation and evolution remains controversial. In this study the evolution of flower traits restricting access to pollinators was analysed in the bifid toadflaxes (Linaria sect. Versicolores), a monophyletic group of ~30 species and subspecies with highly specialized corollas.<h4>Methods</h4>A time-calibrated phylogeny based on both nuclear and plastid DNA sequences was obtained using a coalescent-based method, and flower mo ...[more]

PMID: 24142920

Similar Datasets

Project description:Organs are the ensemble of different cell types in a complex architectural milieu. It is well-known that progression through fate decisions sets up the complex cellular makeup and architecture of an organ, but how that same architecture may impact on cell fate is less clear. We sought to examine this by taking advantage of the unique capabilities of organoids as a tractable in vitro model to interrogate how fate and form interact during organ development. Screening methodological variations encountered in the literature revealed that common protocol adjustments, such as small molecule patterning and exposure to exogenous extracellular matrix, impacted various aspects of morphology, from macro structure to tissue architecture. We demonstrated that overall morphology is a predictor of tissue architecture and that perturbing morphology results in changes in cytoarchitecture. Vice-versa, perturbing cytoarchitecture by mechanically redistributing cells in a random spatial conformation resulted in a simplified overall morphology. We next examined the impact of these morphological perturbations on cell fate through integrated snRNA-seq and spatial transcriptomics within the phenotypic landscape. Regardless of the specific protocol, organoids with more complex morphology better mimicked in vivo human fetal brain development than organoids with simplified morphology. Further, organoids with perturbed tissue architecture profiled with scRNA-seq over a time course experiment displayed aberrant temporal progression in cell fate, with cells being intermingled in both space and time. Finally, imparting a simplified morphology through physical encapsulation led to disrupted tissue cytoarchitecture and a similar abnormal temporal progression. These data not only point to the importance of tissue morphology in organoid fidelity compared to in vivo, but also demonstrate that cells require proper spatial coordinates in order to undergo the proper temporal trajectory of events.

Dataset Information

Corolla morphology influences diversification rates in bifid toadflaxes (Linaria sect. Versicolores).

Background and aims

Methods

Key results

Conclusions

Publications

Corolla morphology influences diversification rates in bifid toadflaxes (Linaria sect. Versicolores).

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure