Range-wide pattern of genetic variation in Colobanthus quitensis

• Published in: Polar biology Vol. 41; no. 12; pp. 2467 - 2479
• Main Authors: Koc, Justyna, Androsiuk, Piotr, Chwedorzewska, Katarzyna Joanna, Cuba-Díaz, Marely, Górecki, Ryszard, Giełwanowska, Irena
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.12.2018; Springer; Springer Nature B.V
• Subjects: Adaptation; Alleles; Bayesian analysis; Biological diversity; Biomedical and Life Sciences; Clustering; Colobanthus quitensis; Deoxyribonucleic acid; Differentiation; DNA; Ecology; Environmental conditions; Gene polymorphism; Genetic aspects; Genetic diversity; Genetic markers; Genetic polymorphisms; Genetic research; Genetic variability; Genetic variation; Geographical distribution; Heterozygosity; Life Sciences; Microbiology; Molecular chains; Oceanography; Original Paper; Plant Sciences; Polymorphism; Population differentiation; Population genetics; Populations; Probability theory; Refugia; Species; Variance analysis; Zoology; iPBS; Antarctic pearlwort; Genetic diversity; Antarctica; Genetic structure
• ISSN: 0722-4060; 1432-2056
• DOI: 10.1007/s00300-018-2383-5

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.