Barley sodium content is regulated by natural variants of the Na+ transporter HvHKT1;5.
Commun Biol
; 3(1): 258, 2020 05 22.
Article
em En
| MEDLINE
| ID: mdl-32444849
ABSTRACT
During plant growth, sodium (Na+) in the soil is transported via the xylem from the root to the shoot. While excess Na+ is toxic to most plants, non-toxic concentrations have been shown to improve crop yields under certain conditions, such as when soil K+ is low. We quantified grain Na+ across a barley genome-wide association study panel grown under non-saline conditions and identified variants of a Class 1 HIGH-AFFINITY-POTASSIUM-TRANSPORTER (HvHKT1;5)-encoding gene responsible for Na+ content variation under these conditions. A leucine to proline substitution at position 189 (L189P) in HvHKT1;5 disturbs its characteristic plasma membrane localisation and disrupts Na+ transport. Under low and moderate soil Na+, genotypes containing HvHKT15P189 accumulate high concentrations of Na+ but exhibit no evidence of toxicity. As the frequency of HvHKT15P189 increases significantly in cultivated European germplasm, we cautiously speculate that this non-functional variant may enhance yield potential in non-saline environments, possibly by offsetting limitations of low available K+.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Proteínas de Plantas
/
Sódio
/
Hordeum
/
Brotos de Planta
/
Raízes de Plantas
/
Regulação da Expressão Gênica de Plantas
/
Proteínas de Transporte de Cátions
Idioma:
En
Ano de publicação:
2020
Tipo de documento:
Article