The genome of Draba nivalis shows signatures of adaptation to the extreme environmental stresses of the Arctic

Nowak, Michael D.; Birkeland, Siri; Mandakova, Terezie; Choudhury, Rimjhim Roy; Guo, Xinyi; Gustafsson, Anna Lovisa S.; Gizaw, Abel; Schroder-Nielsen, Audun; Fracassetti, Marco; Brysting, Anne K.; Rieseberg, Loren; Slotte, Tanja; Parisod, Christian; Lysak, Martin A.; Brochmann, Christian (2020). The genome of Draba nivalis shows signatures of adaptation to the extreme environmental stresses of the Arctic. Molecular ecology resources, 21(3), pp. 661-676. Wiley 10.1111/1755-0998.13280

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The Arctic is one of the most extreme terrestrial environments on the planet. Here, we present the first chromosome-scale genome assembly of a plant adapted to the high Arctic, Draba nivalis (Brassicaceae), an attractive model species for studying plant adaptation to the stresses imposed by this harsh environment. We used an iterative scaffolding strategy with data from short-reads, single-molecule long reads, proximity ligation data, and a genetic map to produce a 302 Mb assembly that is highly contiguous with 91.6% assembled into eight chromosomes (the base chromosome number). To identify candidate genes and gene families that may have facilitated adaptation to Arctic environmental stresses, we performed comparative genomic analyses with nine non-Arctic Brassicaceae species. We show that the D. nivalis genome contains expanded suites of genes associated with drought and cold stress (e.g., related to the maintenance of oxidation-reduction homeostasis, meiosis, and signaling pathways). The expansions of gene families associated with these functions appear to be driven in part by the activity of transposable elements. Tests of positive selection identify suites of candidate genes associated with meiosis and photoperiodism, as well as cold, drought, and oxidative stress responses. Our results reveal a multifaceted landscape of stress adaptation in the D. nivalis genome, offering avenues for the continued development of this species as an Arctic model plant.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS)
08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS) > Ecological Genomics

UniBE Contributor:

Choudhury, Rimjhim Roy and Parisod, Christian Gérard

Subjects:

500 Science > 580 Plants (Botany)

ISSN:

1755-098X

Publisher:

Wiley

Language:

English

Submitter:

Peter Alfred von Ballmoos-Haas

Date Deposited:

30 Nov 2020 09:34

Last Modified:

14 Mar 2021 02:51

Publisher DOI:

10.1111/1755-0998.13280

Uncontrolled Keywords:

adaptation, Arctic, Brassicaceae, chromosome-scale assembly, linkage map

BORIS DOI:

10.7892/boris.148525

URI:

https://boris.unibe.ch/id/eprint/148525

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