The obscure events contributing to the evolution of an incipient sex chromosome in Populus: a retrospective working hypothesis

Tuskan, Gerald A.; DiFazio, Stephen P.; Faivre-Rampant, Patricia; Gaudet, Muriel; Harfouche, Antoine; Jorge, Véronique; Labbé, Jessy; Ranjan, Priya; Sabatti, Maurizio; Slavov, Gancho; Street, Nathaniel R.; Tschaplinski, Timothy J.; Yin, Tongming

doi:10.1007/s11295-012-0495-6

Cited by 55 publications

(72 citation statements)

References 101 publications

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“…This difference might be explained by balancing selection on chromosome III, whereas both balancing and divergent selection were detected on chromosome XIX. Indications for divergent selection in BayeScan analyses of both species (Table 4) accumulate especially in the chromosome part closer to the sex determination region of European species (Gaudet et al 2008;Yin et al 2008;Paolucci et al 2010;Pakull et al 2011;Tuskan et al 2012). These patterns support the hypothesis that the evolution of NBS-LRR genes on chromosome XIX is, directly or indirectly, linked to the evolution of sex determination.…”

Section: R-genes and Sex Determinationsupporting

confidence: 60%

“…Although genetic maps show that sex determination in European Populus species is located further towards the centromere (Paolucci et al 2010;Tuskan et al 2012;Kersten et al 2014) and ongoing genomic work in P. trichocarpa continues to discover novel aspects of the sex determination system (Hou et al 2015;Geraldes et al 2015), this chromosome block was shown to present segregation distortion and reduced recombination in P. alba and P. tremula, as expected for an incipient sex chromosome (Macaya-Sanz et al 2011). The presence of a large NBS-LRR gene cluster may explain the evolution of this particular chromosome.…”

Section: R-genes and Sex Determinationmentioning

confidence: 94%

“…Despite high levels of synteny among Populus genomes, the location of the gender determination locus appears to be variable in position along chromosome XIX in different sections of the Populus genus (Gaudet et al 2008;Yin et al 2008;Pakull et al 2011;Kersten et al 2014). In P. alba and P. tremula, sex determination appears to have a centromeric localization rather than the peritelomeric localization described for Populus trichocarpa (Tuskan et al 2012). These different positions may point to the presence of groups of sexdetermining and/or sexually antagonistic mutations along the chromosome, effectively representing a gender Bsuper locusd ue to recombination suppression (which has been documented in both subgenera; Yin et al 2008;Macaya-Sanz et al 2011;Geraldes et al 2015).…”

Section: Introductionmentioning

confidence: 93%

“…The co-localization of sex determination and R-genes on chromosome XIX poses the question whether these two features have co-evolved (Tuskan et al 2012). To understand the potential co-evolutionary role of R-genes in this special region of the genome, we analyzed three R-gene clusters, including the super cluster on the incipient sex chromosome and two clusters on autosomal chromosomes.…”

Section: Introductionmentioning

confidence: 99%

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Patterns of genetic diversity and differentiation in resistance gene clusters of two hybridizing European Populus species

Caseys

Stölting

Barbará

et al. 2015

Tree Genetics & Genomes

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Resistance genes (R-genes) are essential for longlived organisms such as forest trees, which are exposed to diverse herbivores and pathogens. In short-lived model species, R-genes have been shown to be involved in species isolation. Here, we studied more than 400 trees from two natural hybrid zones of the European Populus species Populus alba and Populus tremula for microsatellite markers located in three R-gene clusters, including one cluster situated in the incipient sex chromosome region. The results indicate that all three R-gene clusters present extensive linkage disequilibrium (LD). Outlier tests suggest balancing selection as a potential driver of R-gene diversity, but divergent selection was also detected. Nucleotide-binding site leucine-rich repeat (NBS-LRR) type R-gene clusters exhibit low species differentiation and appear to be affected by shared selection pressures between species, recurrent interspecific gene flow, or both. Our results are consistent with a role for R-gene clusters in the evolution of chromosome XIX, recently put forward as an incipient sex chromosome in Populus.

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Section: R-genes and Sex Determinationsupporting

confidence: 60%

Section: R-genes and Sex Determinationmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Patterns of genetic diversity and differentiation in resistance gene clusters of two hybridizing European Populus species

Caseys

Stölting

Barbará

et al. 2015

Tree Genetics & Genomes

View full text Add to dashboard Cite

show abstract

“…The genus Populus results to be an excellent model for studying the evolution of gender determination because of the genuswide occurrence of dioecy-related genderdetermining systems that can provide new perspectives on the genetic mechanism of gender determination in plants in general (Tuskan et al 2012, Tognetti 2012. The genetic control of important adaptive traits is still poorly understood in most forest trees species.…”

Section: Breeding For Phytoremediationmentioning

confidence: 99%

Shaping the multifunctional tree: the use of Salicaceae in environmental restoration

Tognetti¹,

Cocozza²,

Marchetti³

2013

iForest

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Poplars and willows (and other fast growing tree species) form an important component of agroforestry systems, providing a wide range of ecosystem services and products. The workshop held in Capracotta (6th and 7th June 2012) has communicated the latest research on poplars and willows in the field of environmental restoration conducted in Italy, providing a condensed overview on their basic response to pollutants and use in environmental monitoring, highlighting future challenges of phytotechnology issues. In the frame of the project MIUR-PRIN 2008 “Molecular, physiological, and agronomic analyses for selecting and managing Salicacee in phytoremediation”, 17 talks were delivered to an audience of more than 50 researchers. Prominence was given to stress biology and the importance of poplar and willow breeding in meeting the needs of ecological restoration. The aim of this review is provide a timely account of the questions related to phytotechnology in shaping the multifunctional tree, particularly with regard to tree responses to environmental pollution. While the question is scientifically challenging, progress may be achieved by exposing the different environmental restoration models and underlying guiding principles to tests against experimental data and each other. Research and development should focus simultaneously on maximizing the yield of multipurpose tree plantations, while preserving or restoring ecosystem services of close-to-nature willow-poplar stands (e.g., riparian forests). We hope that this review will stimulate further studies in this interesting area of tree biology

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Fitness dynamics within a poplar hybrid zone: I.Prezygotic and postzygotic barriers impacting a native poplar hybrid stand

Roe

MacQuarrie

Gros‐Louis

et al. 2014

Ecology and Evolution

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Hybridization and introgression are pervasive evolutionary phenomena that provide insight into the selective forces that maintain species boundaries, permit gene flow, and control the direction of evolutionary change. Poplar trees (Populus L.) are well known for their ability to form viable hybrids and maintain their distinct species boundaries despite this interspecific gene flow. We sought to quantify the hybridization dynamics and postzygotic fitness within a hybrid stand of balsam poplar (Populus balsamifera L.), eastern cottonwood (P. deltoides Marsh.), and their natural hybrids to gain insight into the barriers maintaining this stable hybrid zone. We observed asymmetrical hybrid formation with P. deltoides acting as the seed parent, but with subsequent introgression biased toward P. balsamifera. Native hybrids expressed fitness traits intermediate to the parental species and were not universally unfit. That said, native hybrid seedlings were absent from the seedling population, which may indicate additional selective pressures controlling their recruitment. It is imperative that we understand the selective forces maintaining this native hybrid zone in order to quantify the impact of exotic poplar hybrids on this native system.

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The obscure events contributing to the evolution of an incipient sex chromosome in Populus: a retrospective working hypothesis

Cited by 55 publications

References 101 publications

Patterns of genetic diversity and differentiation in resistance gene clusters of two hybridizing European Populus species

Patterns of genetic diversity and differentiation in resistance gene clusters of two hybridizing European Populus species

Shaping the multifunctional tree: the use of Salicaceae in environmental restoration

Fitness dynamics within a poplar hybrid zone: I.Prezygotic and postzygotic barriers impacting a native poplar hybrid stand

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