The Role of Interspecific Hybridisation in Adaptation and Speciation: Insights From Studies in Senecio

Wong, Edgar L. Y.; Hiscock, Simon J.; Filatov, Dmitry A.

doi:10.3389/fpls.2022.907363

Cited by 14 publications

(12 citation statements)

References 144 publications

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“…Signi cant climatic differences were evident along an altitudinal gradient, resulting in a shortened plant lifespan and delayed pollination, which affected gene ow and led to genetic differentiation among plant populations (Ershadi and Farrokhi Toolir 2022). Interspeci c hybridization may also affect the genetic structure along altitudinal gradients (Wong et al 2022). Overall, alleles of some genotypes may introgress into other genotypes, causing a genetic cline at speci c loci along elevational gradients.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of diversity in selected populations of Iranian date palm (Phoenix dactylifera L.) using ISSR markers

Jorjandi,

Khoshroo,

Toolir

et al. 2023

Preprint

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Date palm (Phoenix dactylifera L.) is cultivated mainly in arid and semiarid regions of the south and southwest of Iran. Sixty-nine Iranian genotypes were selected from 13 populations. One Moroccan genotype was also included in the experiment. The genotypes were sampled in Azizabad agro-research station in Kerman province, Iran. The number of alleles per locus ranged from 5 to 10, totaling 65. Polymorphism information content (PIC) varied from 6 to 30%, averaging at 19.4%. The highest and lowest values of effective alleles were found in Kerman (Ne = 1.49) and Bushehr (Ne = 1.15), respectively. The highest value of the Shannon index (I = 40%) and polymorphic loci percentage (PL = 67.69%) were detected in the ‘Kerman’ population. A high degree of genetic diversity was found in the ‘Hormozgan’ population (He = 0.26). The highest correlation coefficient (r = 0.983) was observed between Kerman and Hormozgan. Based on Nei’s genetic identity, the first two principal coordinates (PCoA) showed that the populations of Fars, Morocco, and Bushehr were classified as three separate groups, unlike the Kerman, Hormozgan, Khuzestan, and Persian Gulf Basin (PGB) populations. In addition, bilateral charts and genetic relatedness among the genotypes were illustrated by STRUCTURE software, which divided the 70 date palm genotypes into seven groups. The grouping of genotypes did not correlate with their geographical distribution. Thus, the Q-values of the genotypes grouped most of them as mixed. It seems that a lack of clear separation among the genotypes was because of their shared genetic background. To assist in future crossing programs, our findings showed that ISSR markers prioritized several male stocks of date palm.

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Section: Resultsmentioning

confidence: 99%

Evaluation of diversity in selected populations of Iranian date palm (Phoenix dactylifera L.) using ISSR markers

Jorjandi,

Khoshroo,

Toolir

et al. 2023

Preprint

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“…Genetic variation introduced through hybridization can be maladaptive, neutral or adaptive (Moran et al, 2021; Wong et al 2022; Zeberg & Pääbo 2020). While its consequences remain difficult to predict and negative consequences may not be observable for long periods, an adaptive role of hybridization has been demonstrated in numerous animal and plant taxa (Arnold et al 2016; Dasmahapatra et al 2012; Lamichhaney et al 2015; Leroy et al 2020; Taylor and Larson 2019).…”

Section: Discussionmentioning

confidence: 99%

The explosive radiation of the NeotropicalTillandsiasubgenusTillandsia(Bromeliaceae) has been facilitated by pervasive hybridization

Yardeni,

Barfuss,

Till

et al. 2023

Preprint

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The recent rapid radiation ofTillandsiasubgenusTillandsia(Bromeliaceae) provides an attractive system to study the drivers and limits of species diversification. This species-rich Neotropical monocot clade includes predominantly epiphytic species displaying vast phenotypic diversity. Recent in-depth phylogenomic work revealed that the subgenus originated within the last 7 MY while expanding through one major event from South into Central America within the last 5 MY. However, disagreements between phylogenies and lack of resolution at shallow nodes suggested that hybridization occurred throughout the radiation, together with frequent incomplete lineage sorting and/or considerable gene family evolution. We used whole-genome resequencing data and a newly available reference genome to explore the evolutionary history of 34 representative ingroup species employing both a tree-based and a network approach. Our results indicate that lineage co-occurrence does not predict relatedness and confirm significant deviations from a tree-like structure, coupled with pervasive gene tree discordance. Focusing on hybridization, ABBA-BABA and related statistics were used to infer the rates and relative timing of introgression, while topology weighting uncovered high heterogeneity of the phylogenetic signal along the genome. High rates of hybridization within and among clades suggest that, in contrast to previous hypotheses, the expansion of subgenusTillandsiainto Central America proceeded in several dispersal events, punctuated by episodes of diversification and gene flow. Network analysis revealed reticulation as a prominent propeller during radiation and establishment in different ecological niches. This work contributes a plant example of prevalent hybridization during rapid species diversification, supporting the hypothesis that interspecific gene flow facilitates explosive diversification.

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“…However, there are many examples of actively hybridising species or introgressed populations that maintain their genetic identities without them merging into a single lineage (e.g., Helianthus: Owens et al, 2016;Owens et al, 2021;Senecio: Wong et al, 2020;Wong et al, 2022;Wong et al, 2023;Silene: Muir et al, 2012;Hu and Filatov, 2016;Filatov, 2018;Karrenberg et al, 2019). In these species, certain genomic regions help to maintain species identity.…”

Section: Recombination Versus Divergencementioning

confidence: 99%

The role of recombination landscape in species hybridisation and speciation

Wong

Filatov

2023

Front. Plant Sci.

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It is now well recognised that closely related species can hybridize and exchange genetic material, which may promote or oppose adaptation and speciation. In some cases, interspecific hybridisation is very common, making it surprising that species identity is preserved despite active gene exchange. The genomes of most eukaryotic species are highly heterogeneous with regard to gene density, abundance of repetitive DNA, chromatin compactisation etc, which can make certain genomic regions more prone or more resistant to introgression of genetic material from other species. Heterogeneity in local recombination rate underpins many of the observed patterns across the genome (e.g. actively recombining regions are typically gene rich and depleted for repetitive DNA) and it can strongly affect the permeability of genomic regions to interspecific introgression. The larger the region lacking recombination, the higher the chance for the presence of species incompatibility gene(s) in that region, making the entire non- or rarely recombining block impermeable to interspecific introgression. Large plant genomes tend to have highly heterogeneous recombination landscape, with recombination frequently occurring at the ends of the chromosomes and central regions lacking recombination. In this paper we review the relationship between recombination and introgression in plants and argue that large rarely recombining regions likely play a major role in preserving species identity in actively hybridising plant species.

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The Role of Interspecific Hybridisation in Adaptation and Speciation: Insights From Studies in Senecio

Cited by 14 publications

References 144 publications

Evaluation of diversity in selected populations of Iranian date palm (Phoenix dactylifera L.) using ISSR markers

Evaluation of diversity in selected populations of Iranian date palm (Phoenix dactylifera L.) using ISSR markers

The explosive radiation of the NeotropicalTillandsiasubgenusTillandsia(Bromeliaceae) has been facilitated by pervasive hybridization

The role of recombination landscape in species hybridisation and speciation

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