Genetic diversity of<i>Colobanthus quitensis</i>across the Drake Passage

Acuña‐Rodríguez, Ian S.; Oses, Rómulo; Cortés-Vasquez, Jorge; Torres-Díaz, Cristián; Molina‐Montenegro, Marco A.

doi:10.1017/s1479262113000270

Cited by 9 publications

(10 citation statements)

References 18 publications

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“…Although sexual reproduction in limited in C . quitensis [ 15 – 38 ], it maintains low but significant levels of within-populations genetic diversity [ 43 ].…”

Section: Methodsmentioning

confidence: 99%

Biological Interactions and Simulated Climate Change Modulates the Ecophysiological Performance of Colobanthus quitensis in the Antarctic Ecosystem

et al. 2016

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Most climate and environmental change models predict significant increases in temperature and precipitation by the end of the 21st Century, for which the current functional output of certain symbioses may also be altered. In this context we address the following questions: 1) How the expected changes in abiotic factors (temperature, and water) differentially affect the ecophysiological performance of the plant Colobanthus quitensis? and 2) Will this environmental change indirectly affect C. quitensis photochemical performance and biomass accumulation by modifying its association with fungal endophytes? Plants of C. quitensis from King George Island in the South Shetland archipelago (62°09′ S), and Lagotellerie Island in the Antarctic Peninsula (65°53′ S) were put under simulated abiotic conditions in growth chambers following predictive models of global climate change (GCC). The indirect effect of GCC on the interaction between C. quitensis and fungal endophytes was assessed in a field experiment carried out in the Antarctica, in which we eliminated endophytes under contemporary conditions and applied experimental watering to simulate increased precipitation input. We measured four proxies of plant performance. First, we found that warming (+W) significantly increased plant performance, however its effect tended to be less than watering (+W) and combined warming and watering (+T°+W). Second, the presence of fungal endophytes improved plant performance, and its effect was significantly decreased under experimental watering. Our results indicate that both biotic and abiotic factors affect ecophysiological performance, and the directions of these influences will change with climate change. Our findings provide valuable information that will help to predict future population spread and evolution through using ecological niche models under different climatic scenarios.

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“…Although sexual reproduction in limited in C . quitensis [ 15 – 38 ], it maintains low but significant levels of within-populations genetic diversity [ 43 ].…”

Section: Methodsmentioning

confidence: 99%

Biological Interactions and Simulated Climate Change Modulates the Ecophysiological Performance of Colobanthus quitensis in the Antarctic Ecosystem

et al. 2016

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“…Chwedorzewska et al 2004;Bednarek 2008, 2011;van de Wouw et al 2008;Volkov et al 2010). Colobanthus quitensis is also poorly studied, as our understanding of its genetic composition and characteristics is based on outmoded methods like isoenzymatic analyses (Lee and Postle 1975), or very limited sample size (Gianoli et al 2004;Acuña−Rodríguez et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Genetic variability of Colobanthus quitensis from King George Island (Antarctica)

Androsiuk¹,

Chwedorzewska²,

Szandar³

et al. 2015

Polish Polar Research

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Antarctic pearlwort (Colobanthus quitensis) is one of the flowering plant species considered native to maritime Antarctica. Although the species was intensively analyzed towards its morphological, anatomical and physiological adaptation to local environment, its genetic variability is still poorly studied. In the presented study, a recently developed retrotransposon−based DNA marker system (inter Primer Binding Site -iPBS) was applied to assess the genetic diversity and differentiation of C. quitensis populations from King George Island (South Shetland Islands, West Antarctic). A total of 143 scoreable bands were detected using 7 iPBS primers among 122 plant specimens representing 8 populations. 55 (38.5%) bands were found polymorphic, with an average of 14.3% polymorphic frag− ments per primer. Nine of all observed fragments were represented as a private bands de− ployed unevenly among populations. Low genetic diversity (on average H e = 0.040 and I = 0.061) and moderate population differentiation (F ST = 0.164) characterize the analyzed material. Clustering based on PCoA revealed, that the populations located on the edges of the study area diverge from the central populations. The pattern of population differentia− tion corresponds well with their geographic location and the characteristics of the sampling sites. Due to the character of iPBS markers, the observed genetic variability of populations may be explained by the genome rearrangements caused by mobilization of mobile genetic elements in the response to various stress factors. Additionally, this study demonstrates the usefulness of iPBS markers for genetic diversity studies in wild species.

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“…Only C. quitensis from pBy represents a very low level of genetic diversity, which can be attributed to a limited number of individuals available for that site. Significantly higher levels of allelic richness and higher expected heterozygosity for the Maritime Antarctic populations of C. quitensis in comparison to the population from Punta Arenas (South America) was also observed by Acuña-Rodríguez et al (2014).…”

Section: Genetic Diversity and Differentiation Of Colobanthus Quitensismentioning

confidence: 74%

“…In case of the Antarctic flora, it is difficult to draw conclusions about its evolutionary history since data on contemporary species distributions are not sufficient and this question requires an approach combining knowledge of Antarctic plant species distribution with studies concerning their genetic diversity and rates of evolution. Unfortunately, in case of the C. quitensis studies which can provide insights into previous population fragmentation and bottlenecks, historical patterns of dispersal and gene flow, relatedness between the Antarctic and South American populations are still at a very early stage (Gianoli et al 2004;Acuña-Rodríguez et al 2014).…”

Section: Phytogeographymentioning

confidence: 99%

“…However, information on the genetic variation of these species is limited and devoted almost exclusively to D. antarctica (e.g., Chwedorzewska and Bednarek 2008;van de Wouw et al 2008;Volkov et al 2010;Chwedorzewska and Bednarek 2011;González et al 2016). As regards C. quitensis, results of the genetic variation studies can be found so far in only a few papers, which suffer from limited geographic range or the low number of populations studied (Lee and Postle 1975;Gianoli et al 2004;Acuña-Rodríguez et al 2014). More recently, two more papers concerning C. quitensis genetics appeared, but they were focused on selected areas of the species genomics like the sequence of chloroplast genome (Kang et al 2016) or genome size estimated by flow cytometry (Cuba-Díaz et al 2017b).…”

Section: Introductionmentioning

confidence: 99%

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Range-wide pattern of genetic variation in Colobanthus quitensis

et al. 2018

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There is only one species representing Magnoliopsida which is considered as native to the Antarctic, i.e., Antarctic pearlwort (Colobanthus quitensis). Although it was intensively studied toward the morphophysiological adaptation to extreme environmental conditions of that area, there is still a lack of sufficient data on its genetic variability. Nine C. quitensis populations from Chile and the Maritime Antarctic were sampled to estimate the pattern of genetic variation in relation to the geographic distribution of analyzed populations and postglacial history of the species. The retrotransposon-based DNA marker system used in our studies appeared to be effective in revealing genetic polymorphism between individuals and genetic differentiation among populations. Although the level of polymorphism was low (9.57%), the Analysis of Molecular Variance showed that overall population differentiation was high (F ST = 0.6241) and revealed significant differentiation between the Northern and Southern Group of populations as well as the population from Conguillio Park. The observed genetic subdivision of C. quitensis populations was confirmed by Bayesian clustering and results of Principal Coordinates Analysis. The Southern Group of populations was characterized by generally higher genetic diversity, which was expressed by the values of the effective number of alleles, expected heterozygosity and by the distribution of private alleles. Our results suggest that the species may have survived the Last Glacial Maximum in refugia located both on the South American continent and in geographically isolated islands of the Maritime Antarctic, i.e., they support the concept of the multiregional origin of C. quitensis in Antarctica.

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Genetic diversity ofColobanthus quitensisacross the Drake Passage

Cited by 9 publications

References 18 publications

Biological Interactions and Simulated Climate Change Modulates the Ecophysiological Performance of Colobanthus quitensis in the Antarctic Ecosystem

Biological Interactions and Simulated Climate Change Modulates the Ecophysiological Performance of Colobanthus quitensis in the Antarctic Ecosystem

Genetic variability of Colobanthus quitensis from King George Island (Antarctica)

Range-wide pattern of genetic variation in Colobanthus quitensis

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