Insights into the genetic architecture of sexual dimorphism from an interspecific cross between two diverging <i>Silene</i> (Caryophyllaceae) species

Baena‐Díaz, Fernanda; Zemp, Niklaus; Widmer, Alex

doi:10.1111/mec.15271

Cited by 7 publications

(4 citation statements)

References 96 publications

(150 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In many other systems, oligo- or polygenic control of fitness components was detected in natural settings, especially when the number of contributing loci was explicitly modelled (Lind et al ., 2017; Bresadola et al ., 2019; Exposito-Alonso et al ., 2019). A polygenic genetic architecture of fitness components in our study system does appear likely given that QTL studies detected many loci distributed throughout the genome that were associated with ecologically relevant traits (Liu & Karrenberg, 2018; Baena□Díaz et al ., 2019).…”

Section: Discussionmentioning

confidence: 99%

A polygenic architecture with conditionally neutral effects underlies ecological differentiation in Silene

Gramlich

Liu

Favre

et al. 2021

Preprint

View full text Add to dashboard Cite

Ecological differentiation can drive speciation but it is unclear how the genetic architecture of habitat-dependent fitness contributes to lineage divergence. We investigated the genetic architecture of cumulative flowering, a fitness component, in second-generation hybrids between Silene dioica and S. latifolia transplanted into the natural habitat of each species. We used reduced-representation sequencing and Bayesian Sparse Linear Mixed Models (BSLMMs) to analyze the genetic control of cumulative flowering in each habitat. Our results point to a polygenic architecture of cumulative flowering. Allelic effects were mostly beneficial or deleterious in one habitat and neutral in the other. The direction of allelic effects was associated with allele frequency differences between the species: positive-effect alleles were often derived from the native species, whereas negative-effect alleles, at other loci, tended to originate from the non-native species. We conclude that ecological differentiation is governed and maintained by many loci with small, conditionally neutral effects. Conditional neutrality may result from differences in selection targets in the two habitats and provides hidden variation upon which selection can act. Polygenic architectures of adaptive differentiation are expected to be transient during lineage divergence and may therefore be unrelated to high genetic differentiation at the underlying loci.

show abstract

Section: Discussionmentioning

confidence: 99%

A polygenic architecture with conditionally neutral effects underlies ecological differentiation in Silene

Gramlich

Liu

Favre

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…This species presents a generalist insect-pollinated system, with Bombus species, Syrphidae, diurnal butterflies and Sphingidae as pollinators (Baker 1947;Westerbergh and Saura 1994). Silene dioica has been documented as sexually dimorphic for flower size and number (males > females; Kay et al 1984;Baena-Díaz et al 2019;Moquet et al 2020), total nectar production at the flower level (females > males; Hemborg and Bond 2005) and flowering duration (males > females; Hemborg 1998).…”

Section: Study Systemmentioning

confidence: 99%

Sex-specific selection patterns in a dioecious insect-pollinated plant

2023

View full text Add to dashboard Cite

Competition for mate acquisition is the hallmark of any sexual organism. In insect-pollinated plants, competition to attract pollinators is expected to result in pollinator-mediated selection on attractive floral traits. This could overlap with sexual selection if the number of mating partners increases with pollinator attraction, resulting in an improved reproductive success. In this study, we measured a set of floral traits and estimated individual fitness in male and female Silene dioica in an experimental population. Results align with the predictions of Bateman’s principles, in the absence of pollen limitation. In females, natural selection acted on traits that are typically linked with fertility (number of flowers and number of gametes), and selection strength was similar in open- and hand-pollinated females, suggesting a limited role of pollinator-mediated selection. In males, flowering duration and corolla width were positively associated with both reproductive success and number of mates, suggesting that sexual selection has played a role in the evolution of these traits. The use of Bateman’s metrics further confirmed stronger sexual selection in males than in females. Taken together, our results shed light on the occurrence of sex-specific patterns of selection in an insect-pollinated plant population.

show abstract

“…S. dioica and S. latifolia are related species with similar DNA content and chromosome number. In nature, hybrids have often been described and analyzed from genetic and ecological perspectives ( Minder et al., 2007 ; Baena-Diaz et al., 2019 ; Karrenberg et al., 2019 ). Nevertheless, the description of the phenotype of artificial hybrids obtained in artificial crosses in the laboratory dates to the decades of fifties and sixties of the past century ( Baker, 1950 ; Van Nigtevecht, 1966 ), and concentrates on the characteristics that may be of diagnostic use in the recognition of hybrids.…”

Section: Discussionmentioning

confidence: 99%

Seed shape and size of Silene latifolia, differences between sexes, and influence of the parental genome in hybrids with Silene dioica

Marcel,

Javier,

Emilio

et al. 2024

Front. Plant Sci.

View full text Add to dashboard Cite

IntroductionPlants undergo various natural changes that dramatically modify their genomes. One is polyploidization and the second is hybridization. Both are regarded as key factors in plant evolution and result in phenotypic differences in different plant organs. In Silene, we can find both examples in nature, and this genus has a seed shape diversity that has long been recognized as a valuable source of information for infrageneric classification.MethodsMorphometric analysis is a statistical study of shape and size and their covariations with other variables. Traditionally, seed shape description was limited to an approximate comparison with geometric figures (rounded, globular, reniform, or heart-shaped). Seed shape quantification has been based on direct measurements, such as area, perimeter, length, and width, narrowing statistical analysis. We used seed images and processed them to obtain silhouettes. We performed geometric morphometric analyses, such as similarity to geometric models and elliptic Fourier analysis, to study the hybrid offspring of S. latifolia and S. dioica.ResultsWe generated synthetic tetraploids of Silene latifolia and performed controlled crosses between diploid S. latifolia and Silene dioica to analyze seed morphology. After imaging capture and post-processing, statistical analysis revealed differences in seed size, but not in shape, between S. latifolia diploids and tetraploids, as well as some differences in shape among the parentals and hybrids. A detailed inspection using fluorescence microscopy allowed for the identification of shape differences in the cells of the seed coat. In the case of hybrids, differences were found in circularity and solidity. Overal seed shape is maternally regulated for both species, whereas cell shape cannot be associated with any of the sexes.DiscussionOur results provide additional tools useful for the combination of morphology with genetics, ecology or taxonomy. Seed shape is a robust indicator that can be used as a complementary tool for the genetic and phylogenetic analyses of Silene hybrid populations.

show abstract

Insights into the genetic architecture of sexual dimorphism from an interspecific cross between two diverging Silene (Caryophyllaceae) species

Cited by 7 publications

References 96 publications

A polygenic architecture with conditionally neutral effects underlies ecological differentiation in Silene

A polygenic architecture with conditionally neutral effects underlies ecological differentiation in Silene

Sex-specific selection patterns in a dioecious insect-pollinated plant

Seed shape and size of Silene latifolia, differences between sexes, and influence of the parental genome in hybrids with Silene dioica

Contact Info

Product

Resources

About