Salinity is an agent of divergent selection driving local adaptation of Arabidopsis to coastal habitats

Busoms, Silvia and Teres, Joana and Huang, Xin-Yuan and Bomblies, Kirsten and Danku, John and Douglas, Alex and Weigel, Detlef and Poschenrieder, Charlotte and Salt, David E. (2015) Salinity is an agent of divergent selection driving local adaptation of Arabidopsis to coastal habitats. Plant Physiology, 168 (3). pp. 915-929. ISSN 1532-2548

[img]
Preview
PDF - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
Download (1MB) | Preview

Abstract

Understanding the molecular mechanism of adaptive evolution in plants provides insights into the selective forces driving adaptation and the genetic basis of adaptive traits with agricultural value. The genomic resources available for Arabidopsis (Arabidopsis thaliana) make it well suited to the rapid molecular dissection of adaptive processes. Although numerous potentially adaptive loci have been identified in Arabidopsis, the consequences of divergent selection and migration (both important aspects of the process of local adaptation) for Arabidopsis are not well understood. Here, we use a multiyear field-based reciprocal transplant experiment to detect local populations of Arabidopsis composed of multiple small stands of plants (demes) that are locally adapted to the coast and adjacent inland habitats in northeastern Spain. We identify fitness tradeoffs between plants from these different habitats when grown together in inland and coastal common gardens and also, under controlled conditions in soil excavated from coastal and inland sites. Plants from the coastal habitat also outperform those from inland when grown under high salinity, indicating local adaptation to soil salinity. Sodium can be toxic to plants, and we find its concentration to be elevated in soil and plants sampled at the coast. We conclude that the local adaptation that we observe between adjacent coastal and inland populations is caused by ongoing divergent selection driven by the differential salinity between coastal and inland soils.

Item Type: Article
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Biosciences
Identification Number: doi:0.1104/pp.15.00427
Depositing User: Eprints, Support
Date Deposited: 26 Jan 2017 12:08
Last Modified: 12 Oct 2017 22:10
URI: http://eprints.nottingham.ac.uk/id/eprint/40107

Actions (Archive Staff Only)

Edit View Edit View