A coastal cline in sodium accumulation in Arabidopsis thaliana is driven by natural variation of the sodium transporter AtHKT1;1.
PLoS Genet
; 6(11): e1001193, 2010 Nov 11.
Article
in En
| MEDLINE
| ID: mdl-21085628
ABSTRACT
The genetic model plant Arabidopsis thaliana, like many plant species, experiences a range of edaphic conditions across its natural habitat. Such heterogeneity may drive local adaptation, though the molecular genetic basis remains elusive. Here, we describe a study in which we used genome-wide association mapping, genetic complementation, and gene expression studies to identify cis-regulatory expression level polymorphisms at the AtHKT1;1 locus, encoding a known sodium (Na(+)) transporter, as being a major factor controlling natural variation in leaf Na(+) accumulation capacity across the global A. thaliana population. A weak allele of AtHKT1;1 that drives elevated leaf Na(+) in this population has been previously linked to elevated salinity tolerance. Inspection of the geographical distribution of this allele revealed its significant enrichment in populations associated with the coast and saline soils in Europe. The fixation of this weak AtHKT1;1 allele in these populations is genetic evidence supporting local adaptation to these potentially saline impacted environments.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Seawater
/
Sodium
/
Genetic Variation
/
Arabidopsis
/
Ecosystem
/
Cation Transport Proteins
/
Symporters
/
Arabidopsis Proteins
Type of study:
Prognostic_studies
Language:
En
Journal:
PLoS Genet
Journal subject:
GENETICA
Year:
2010
Type:
Article
Affiliation country:
United States