Pleistocene range disruption and postglacial expansion with secondary contacts explain the genetic and cytotype structure in the western Balkan endemic Alyssum austrodalmaticum (Brassicaceae)

Zozomová‐Lihová, Judita; Melichárková, Andrea; Svitok, Marek; Španiel, Stanislav

doi:10.1007/s00606-020-01677-5

Cited by 10 publications

(5 citation statements)

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“…Indeed, the Southern Pindos range, the area of C. barbaraeoides , is recognized as an important center of endemism and also a refugial area ( Stevanović et al, 2007 ; Médail and Diadema, 2009 ; Kougioumoutzis et al, 2021 ). Quaternary climatic oscillations have led to species range shifts, repeated range fragmentation, and reduction followed by expansion, and these processes have facilitated contacts between previously isolated lineages and brought opportunities for hybridization ( Nieto Feliner, 2014 ; Marques et al, 2018 ; see, e.g., Blanco-Pastor et al, 2012 ; Maguilla et al, 2017 ; Zozomová-Lihová et al, 2020 ). The great ecological and topographic heterogeneity of Mediterranean mountains has likely favored not only hybridization events, but also the establishment and persistence of newly formed allopolyploids.…”

Section: Discussionmentioning

confidence: 99%

Allele Sorting as a Novel Approach to Resolving the Origin of Allotetraploids Using Hyb-Seq Data: A Case Study of the Balkan Mountain Endemic Cardamine barbaraeoides

et al. 2021

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Mountains of the Balkan Peninsula are significant biodiversity hotspots with great species richness and a large proportion of narrow endemics. Processes that have driven the evolution of the rich Balkan mountain flora, however, are still insufficiently explored and understood. Here we focus on a group of Cardamine (Brassicaceae) perennials growing in wet, mainly mountainous habitats. It comprises several Mediterranean endemics, including those restricted to the Balkan Peninsula. We used target enrichment with genome skimming (Hyb-Seq) to infer their phylogenetic relationships, and, along with genomic in situ hybridization (GISH), to resolve the origin of tetraploid Cardamine barbaraeoides endemic to the Southern Pindos Mts. (Greece). We also explored the challenges of phylogenomic analyses of polyploid species and developed a new approach of allele sorting into homeologs that allows identifying subgenomes inherited from different progenitors. We obtained a robust phylogenetic reconstruction for diploids based on 1,168 low-copy nuclear genes, which suggested both allopatric and ecological speciation events. In addition, cases of plastid–nuclear discordance, in agreement with divergent nuclear ribosomal DNA (nrDNA) copy variants in some species, indicated traces of interspecific gene flow. Our results also support biogeographic links between the Balkan and Anatolian–Caucasus regions and illustrate the contribution of the latter region to high Balkan biodiversity. An allopolyploid origin was inferred for C. barbaraeoides, which highlights the role of mountains in the Balkan Peninsula both as refugia and melting pots favoring species contacts and polyploid evolution in response to Pleistocene climate-induced range dynamics. Overall, our study demonstrates the importance of a thorough phylogenomic approach when studying the evolution of recently diverged species complexes affected by reticulation events at both diploid and polyploid levels. We emphasize the significance of retrieving allelic and homeologous variation from nuclear genes, as well as multiple nrDNA copy variants from genome skim data.

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Section: Discussionmentioning

confidence: 99%

Allele Sorting as a Novel Approach to Resolving the Origin of Allotetraploids Using Hyb-Seq Data: A Case Study of the Balkan Mountain Endemic Cardamine barbaraeoides

et al. 2021

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“…Whereas the taxonomy and evolutionary history of the A. montanum–A. repens species complex have been thoroughly explored in a series of recent studies (e.g., Španiel et al, 2011 , 2017a , b , 2019 ; Magauer et al, 2014 ; Zozomová-Lihová et al, 2014 , 2020 ; Arrigo et al, 2016 ; Melichárková et al, 2017 ), little is known about the phylogenetic relationships and speciation processes of the annual taxa. Here, we attempted to fill this gap by exploring the evolutionary history of all 16 annual taxa of Alyssum reported in Europe, some of which extend also to northern Africa or Asia (see Table 1 ).…”

Section: Introductionmentioning

confidence: 99%

Multiple Drivers of High Species Diversity and Endemism Among Alyssum Annuals in the Mediterranean: The Evolutionary Significance of the Aegean Hotspot

et al. 2021

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The Mediterranean Basin is a significant hotspot of species diversity and endemism, with various distribution patterns and speciation mechanisms observed in its flora. High species diversity in the Mediterranean is also manifested in the monophyletic lineage of Alyssum annuals (Brassicaceae), but little is known about its origin. These species include both diploids and polyploids that grow mainly in open and disturbed sites across a wide elevational span and show contrasting distribution patterns, ranging from broadly distributed Eurasian species to narrow island endemics. Here, we investigated the evolution of European representatives of this lineage, and aimed to reconstruct their phylogeny, polyploid and genome size evolution using flow cytometric analyses, chloroplast and nuclear high- and low-copy DNA markers. The origin and early diversification of the studied Alyssum lineage could be dated back to the Late Miocene/Pliocene and were likely promoted by the onset of the Mediterranean climate, whereas most of the extant species originated during the Pleistocene. The Aegean region represents a significant diversity center, as it hosts 12 out of 16 recognized European species and comprises several (sub)endemics placed in distinct phylogenetic clades. Because several species, including the closest relatives, occur here sympatrically without apparent niche differences, we can reject simple allopatric speciation via vicariance as well as ecological speciation for most cases. Instead, we suggest scenarios of more complex speciation processes that involved repeated range shifts in response to sea-level changes and recurrent land connections and disconnections since the Pliocene. In addition, multiple polyploidization events significantly contributed to species diversity across the entire distribution range. All seven polyploids, representing both widespread species and endemics to the western or eastern Mediterranean, were inferred to be allopolyploids. Finally, the current distribution patterns have likely been affected also by the human factor (farming and grazing). This study illustrates the complexity of evolutionary and speciation processes in the Mediterranean flora.

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“…The high prevalence of polyploids in challenging environments has been already revealed at both local and global scales (Hijmans et al, 2007;Rice et al, 2019). Following deglaciation, the process of polyploidization was likely accelerated in arctic/alpine areas due to the increased frequency of unreduced gamete formation in harsh environments as well as the increased chance of novel contact between previously separated diploids (Novikova et al, 2018;Rice et al, 2019;Zozomová et al, 2020). The transition towards polyploidy may have provided an evolutionary advantage for dealing with the stressful condition of severe environments (Brochmann et al, 2015;Rice et al, 2019).…”

Section: Ploidy and Current Distributionmentioning

confidence: 95%

Are Polyploid Species Less Vulnerable to Climate Change? A Simulation Study in North American <i>Crataegus</i>

Naghiloo,

Vamosi

2023

AJCC

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Understanding the mechanisms underlying plant responses to climate change is an important step toward developing effective mitigation strategies. Polyploidy is an important evolutionary trait that can influence the capacity of plants to adapt to climate change. The environmental flexibility of polyploids suggests their resiliency to climate change, however, such hypotheses have not yet received empirical evidence. To understand how ploidy level may influence response to climate change, we modeled the current and future distribution of 54 Crataegus species under moderate to severe environments and compared the range change between diploids and polyploids. The majority of studied species are predicted to experience considerable range expansion. We found a negative interaction between ploidy and ecoregions in determining the response to climate change. In extreme environments, polyploids are projected to experience a higher range expansion than diploids with climate change, while the opposite is true for moderate environments. The range expansion of Crataegus species can be attributed to their tolerance for a wide range of environmental conditions. Despite the higher tolerance of polyploids to extreme environments, they do not necessarily outperform diploids in moderate environments, which can be attributed to the varying nature of species interactions along a stress gradient.

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Pleistocene range disruption and postglacial expansion with secondary contacts explain the genetic and cytotype structure in the western Balkan endemic Alyssum austrodalmaticum (Brassicaceae)

Cited by 10 publications

References 95 publications

Allele Sorting as a Novel Approach to Resolving the Origin of Allotetraploids Using Hyb-Seq Data: A Case Study of the Balkan Mountain Endemic Cardamine barbaraeoides

Allele Sorting as a Novel Approach to Resolving the Origin of Allotetraploids Using Hyb-Seq Data: A Case Study of the Balkan Mountain Endemic Cardamine barbaraeoides

Multiple Drivers of High Species Diversity and Endemism Among Alyssum Annuals in the Mediterranean: The Evolutionary Significance of the Aegean Hotspot

Are Polyploid Species Less Vulnerable to Climate Change? A Simulation Study in North American <i>Crataegus</i>

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Pleistocene range disruption and postglacial expansion with secondary contacts explain the genetic and cytotype structure in the western Balkan endemic Alyssum austrodalmaticum (Brassicaceae)

Cited by 10 publications

References 95 publications

Allele Sorting as a Novel Approach to Resolving the Origin of Allotetraploids Using Hyb-Seq Data: A Case Study of the Balkan Mountain Endemic Cardamine barbaraeoides

Allele Sorting as a Novel Approach to Resolving the Origin of Allotetraploids Using Hyb-Seq Data: A Case Study of the Balkan Mountain Endemic Cardamine barbaraeoides

Multiple Drivers of High Species Diversity and Endemism Among Alyssum Annuals in the Mediterranean: The Evolutionary Significance of the Aegean Hotspot

Are Polyploid Species Less Vulnerable to Climate Change? A Simulation Study in North American &lt;i&gt;Crataegus&lt;/i&gt;

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Are Polyploid Species Less Vulnerable to Climate Change? A Simulation Study in North American <i>Crataegus</i>