Chromosomal evolution in seagrasses: Is the chromosome number decreasing?

Silva, Silmar Luiz da; Carvalho, Reginaldo de; Magalhães, Karine Matos

doi:10.1016/j.aquabot.2021.103410

Cited by 5 publications

(5 citation statements)

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“…Another is at Ks ≈0.25, positioned at the Halodule clade and supported by 22% duplicated genes. Reconstruction of the evolution of chromosome numbers for marine angiosperms suggested that WGD events had occurred in Zosteraceae and Cymodoceae (Silva et al 2021).…”

Section: Whole Genome-duplications Are Common Across Alismatalesmentioning

confidence: 99%

Phylogenomic analyses of Alismatales shed light into adaptations to aquatic environments

Chen

Morales‐Briones²,

Moody³

et al. 2021

Preprint

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Land plants first evolved from freshwater algae, and flowering plants returned to water as early as the Cretaceous and multiple times beyond. Alismatales is the largest clade of aquatic angiosperms including all marine angiosperms, as well as terrestrial plants. We used Alismatales to explore plant adaptation to aquatic environments by including 95 samples (89 Alismatales species) covering four genomes and 91 transcriptomes (59 generated in this study). To provide a basis for investigating adaptation, we assessed phylogenetic conflict and whole-genome duplication (WGD) events in Alismatales. We recovered a relationship for the three main clades in Alismatales as ((Tofieldiaceae, Araceae), core Alismatids). There is phylogenetic conflict among the backbone of the three main clades that could be due to incomplete lineage sorting and introgression. We identified 18 putative WGD events. One of them had occurred at the most recent common ancestor of core Alismatids, and four occurred at seagrass lineages. Other events are distributed in terrestrial, emergent, and submersed life-forms and seagrasses across Alismatales. We also found that lineage and life-form were each important for different evolutionary patterns for the genes related to freshwater/marine adaptation. For example, some light or ethylene-related genes were lost in the seagrass Zosteraceae, but present in other seagrasses and freshwater species. Stomata-related genes were lost in both submersed freshwater species and seagrasses. Nicotianamine synthase genes, which are important in iron intake, expanded in both submersed freshwater species and seagrasses. Our results advance the understanding of the adaptation to aquatic environments, phylogeny, and whole-genome duplication of Alismatales.

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Section: Whole Genome-duplications Are Common Across Alismatalesmentioning

confidence: 99%

Phylogenomic analyses of Alismatales shed light into adaptations to aquatic environments

Chen

Morales‐Briones²,

Moody³

et al. 2021

Preprint

View full text Add to dashboard Cite

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“…However, varying environmental scenarios throughout scales of spatial and temporal variability might have also affected the phenotype of seagrasses (Kilminster et al, 2015;Papenbrock, 2012). A convergent evolution of seagrasses traits, in terms of shared physiological and morphological characteristics to a marine environment, points to ancient adaptations (da Silva et al, 2021;Lee et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…Seagrasses are a group of marine angiosperms (i.e. flowering plants), of polyphyletic origin, fully adapted to a submerged life across the world's oceans and distributed from tropical to polar coastal areas of the globe (da Silva et al., 2021; Daru et al., 2017; Den Hartog, 1970; Hemminga & Duarte, 2000; Papenbrock, 2012; Short et al., 2007). These plants evolved from terrestrial ancestors that recolonised the world's seas about 70–100 million years ago (Brasier, 1975; Waycott et al., 2007), at least in three independent times through parallel evolution (Les et al., 1997).…”

Section: Introductionmentioning

confidence: 99%

“…Seagrass taxonomy is complex and still unresolved (Papenbrock, 2012; Rock & Daru, 2021), with Den Hartog's (Den Hartog, 1970) study as a seminal contribution to the fundamental phylogeny of seagrass species. Two main clades within Alismatales, petaloid (Hydrocharitaceae) and tepaloid (Cymodoceaceae, Ruppiaceae, Posidoniaceae and Zosteraceae) are typically considered as the backbone of seagrass phylogeny (da Silva et al., 2021; Les et al., 1997; Papenbrock, 2012; Waycott et al., 2014). Seagrass diversity has mostly focused on contemporary, species‐level, metrics that ignore the phylogenetic relationships of seagrasses, despite their potential evolution from common ancestors (Rock & Daru, 2021).…”

Section: Introductionmentioning

confidence: 99%

“…However, varying environmental scenarios throughout scales of spatial and temporal variability might have also affected the phenotype of seagrasses (Kilminster et al., 2015; Papenbrock, 2012). A convergent evolution of seagrasses traits, in terms of shared physiological and morphological characteristics to a marine environment, points to ancient adaptations (da Silva et al., 2021; Lee et al., 2018). To date, however, no study has been carried out to evaluate the prevalence of shared ancestry in seagrass evolution across a range of traits incorporating physiological, morphological and reproductive attributes.…”

Section: Introductionmentioning

confidence: 99%

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Strong phylogenetic signal and models of trait evolution evidence phylogenetic niche conservatism for seagrasses

Tuya,

Martínez‐Pérez,

Fueyo

et al. 2023

Journal of Ecology

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Phylogenetic signal (PS) is the propensity of closely related species to resemble each other. PS has been tested across clades of terrestrial plants; however, insight for seagrasses is still lacking. Signatures of PS and models of niche (trait) evolution can help to detect phylogenetic niche conservatism (PNC), that is, close relatives live in comparable niches. The initial goal of this study was to assess the pattern of PS for the world's seagrasses, by testing the non‐independence of phylogenetic relatedness and seagrass species traits. A phylogeny of 49 seagrasses was constructed, together with a matrix of nine traits covering morphological, life‐history and reproductive attributes. PS of traits was tested through complementary indices (Pagel's λ, Blomberg's K, Moran's I and Abouheif's Cmean). Three models of niche evolution (Brownian Motion, BM; Ornstein–Uhlenbeck, OU; Early Burst, EB) were then fitted to each trait and the multivariate trait matrix. Results supported the existence of strong PS for seagrasses, with a particularly large effect size for seagrass reproductive traits, which followed an EB evolution model. Local Indicators of Phylogenetic Association (local autocorrelation metrics that can help to identify areas of large autocorrelation) supported the presence of PS across seagrass lineages/clades, supported by the dominance of OU as the most parsimonious trait evolution model. The pattern of strong PS seems to be a consequence of long‐term PNC of seagrass traits after initial radiation. Synthesis: Our study highlights the relevance of evolution from common ancestors and shared history underpinning large seagrass phylogenetic structuring.

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