Pattern of natural introgression in a Nothofagus hybrid zone from South American temperate forests

Verónica, El Mujtar; Sola, Georgina; Alejandro, Aparicio; Gallo, Leonardo

doi:10.1007/s11295-017-1132-1

Cited by 10 publications

(2 citation statements)

References 68 publications

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“…In C. arabica , hybridisation and introgression were reported in montane rainforests in south-western Ethiopia (Aerts et al ., 2013). Introgression, however, will only occur when cultivated-wild hybrids form backcrosses with the wild population for many generations and at a large scale (Ridley, 2004; Verónica et al ., 2017). In our study, we found only relatively few F 1 and F 2 hybrids and backcrosses in the wild, which is likely not sufficient for the stable incorporation of alleles of the cultivated gene pool into the CWR gene pool (Anderson and Hubricht 1938; Ellstrand, 2003; Laikre et al ., 2010).…”

Section: Discussionmentioning

confidence: 99%

Cultivated Robusta coffee meets wildCoffea canephora: Evidence of cultivated-wild hybridisation in the Democratic Republic of the Congo

Lauren,

Jonas,

Robrecht

et al. 2023

Preprint

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Background and aimsPlant breeders are increasingly turning to crop wild relatives (CWRs) to ensure global food security amidst a rapidly changing environment. However, CWR populations are confronted with various human-induced threats, including hybridisation with their nearby cultivated crops, posing a significant threat to the wild gene pool. Here, we focussed on Robusta coffee in the Yangambi region in the DR Congo, where cultivated Robusta coffee coexists with its wild relative (Coffea canephora), creating ample opportunity for genetic exchange. We examined the geographical distribution of cultivated Robusta coffee plants and the incidence of hybridisation between cultivated and wild individuals within the rainforest.MethodsWe used Genotyping-by-Sequencing data from 471 C. canephora individuals across various locations, including natural rainforests, home gardens, and the INERA Coffee Collection, a Robusta coffee field genebank. Our analyses involved establishing robust diagnostic fingerprints that differentiate cultivated from wild coffee, identifying cultivated-wild hybrids and mapping their geographical position.Key resultsWe identified cultivated genotypes and cultivated-wild hybrids in zones with clear anthropogenic activity, and where Robusta coffee cultivated in the home gardens may serve as a source for crop-to-wild gene flow. We found relatively few hybrids and backcrosses in the rainforests, which is so far likely not sufficient for the stable incorporation of alleles from the cultivated gene pool into the CWR gene pool.ConclusionsThe cultivation of Robusta coffee in close proximity to its wild gene pool has led to cultivated genotypes and cultivated-wild hybrids appearing within the natural habitats of C. canephora. Yet, given the high overlap between the cultivated and wild gene pool, together with the relatively low frequency of hybridisation, our results indicate that the overall impact in terms of risk of introgression remains limited so far. Nevertheless, it is important to continue monitoring crop-to-wild gene flow to safeguard the wild gene pool of C. canephora.

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Section: Discussionmentioning

confidence: 99%

Cultivated Robusta coffee meets wildCoffea canephora: Evidence of cultivated-wild hybridisation in the Democratic Republic of the Congo

Lauren,

Jonas,

Robrecht

et al. 2023

Preprint

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“…Shifts between isolation and contact can coincide with changes in effective population size (Ne) influencing the direction and extent of genetic exchange, while fine-scale variance at the population or genome-level can further influence elimination or fixation of alleles. In forest trees, genetic exchange often appears to be largely asymmetrical favoring the genomic background of one species due solely or in part to differential dispersal capacity, wind-patterns, and unidirectional reproductive incompatibilities (El Mujtar et al, 2017;Hamilton et al, 2013a;Lepais et al, 2009;Lexer et al, 2005Lexer et al, , 2006. Given that an influx of genetic variants via interspecific gene flow not only buffers Ne, but can generate novel genetic recombinants upon which natural selection can act, characterizing genetic structure and the impact genetic exchange may have across space and time is needed to predict evolution.…”

Section: Introductionmentioning

confidence: 99%

Climate and geography shape hybrid zone dynamics across space and time: insights fromPopulus trichocarpaxP. balsamifera

Bolte

Phannareth

Fitzpatrick

et al. 2023

Preprint

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● Quantifying the mechanisms underlying hybrid zone formation requires an evaluation of both neutral and nonneutral evolutionary processes. Population demographic changes, alongside landscape heterogeneity and climate adaptation, can influence the timing, stability, and extent of introgression where species hybridize. Thus, quantifying interactions across diverged lineages, and the relative contributions of interspecific genetic exchange and selection to divergence at the genome-wide level is needed. ● We quantified the contributions of climate and geography to the genetic structure across replicate contact zones betweenPopulus trichocarpaandP. balsamifera, evaluating the demographic context of hybridization and the role of genetic connectivity over time. ● We found genomic structure differed among the seven latitudinally arrayed transects. While ancestry was strongly structured by climate, geography appears to have restricted gene flow in certain regions of the hybrid zone. The best fitting demographic model indicated high rates of gene flow alongside selection have likely influenced the establishment and maintenance of the hybrid zone. ● Our results point towards the importance of climate in structuring the contact zones betweenP. trichocarpaandP. balsamiferaand emphasize the value of sampling replicated zones of contact to understand how neutral and non-neutral processes influence hybrid zone formation across space and time.

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Application of High-Throughput Sequencing Technologies in Native Forest Tree Species in Argentina: Implications for Breeding

Torales¹,

Mujtar

Poltri

et al. 2020

Low Intensity Breeding of Native Forest Trees in Argentina

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Pattern of natural introgression in a Nothofagus hybrid zone from South American temperate forests

Cited by 10 publications

References 68 publications

Cultivated Robusta coffee meets wildCoffea canephora: Evidence of cultivated-wild hybridisation in the Democratic Republic of the Congo

Cultivated Robusta coffee meets wildCoffea canephora: Evidence of cultivated-wild hybridisation in the Democratic Republic of the Congo

Climate and geography shape hybrid zone dynamics across space and time: insights fromPopulus trichocarpaxP. balsamifera

Application of High-Throughput Sequencing Technologies in Native Forest Tree Species in Argentina: Implications for Breeding

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