RT article
T1 Na+ transporter HKT1;2 reduces flower Na+ content and considerably mitigates the decline in tomato fruit yields under saline conditions
A1 Romero-Aranda, María R.
A1 González-Fernández, Paloma
A1 Pérez-Tienda, Jacob R.
A1 López-Díaz, María R.
A1 Espinosa, Jesús
A1 Granum, Espen
A1 Traverso, Jose A.
A1 Pineda, Benito
A1 Garcia-Sogo, Begona
A1 Moreno, Vicente
A1 Asins, María J.
A1 Belver, Andres
K1 Na+ flower content
K1 Fruit yield
K1 HKT1
K1 2gene
K1 K+ and Na+ homeostasis
K1 Solanum cheesmaniae
K1 F60  Plant physiology and biochemistry
K1 F40  Plant ecology
K1 Solanum lycopersicum
K1 Tomatoes
K1 Salinity
AB Genes encoding HKT1-like Na+ transporters play a key role in the salinity tolerance mechanism in Arabidopsis and other plant species by retrieving Na+ from the xylem of different organs and tissues. In this study, we investigated the role of two HKT1;2 allelic variants in tomato salt tolerance in relation to vegetative growth and fruit yield in plants subjected to salt treatment in a commercial greenhouse under real production conditions. We used two near-isogenic lines (NILs), homozygous for either the Solanum lycopersicum (NIL17) or S. cheesmaniae (NIL14) allele, at HKT1;2 loci and their respective RNAi-Sl/ScHKT1;2 lines. The results obtained show that both ScHKT1;2- and SlHKT1;2-silenced lines display hypersensitivity to salinity associated with an altered leaf Na+/K+ ratio, thus confirming that HKT1;2 plays an important role in Na+ homeostasis and salinity tolerance in tomato. Both silenced lines also showed Na+ over-accumulation and a slight, but significant, reduction in K+ content in the flower tissues of salt-treated plants and consequently a higher Na+/K+ ratio as compared to the respective unsilenced lines. This altered Na+/K+ ratio in flower tissues is associated with a sharp reduction in fruit yield, measured as total fresh weight and number of fruits, in both silenced lines under salinity conditions. Our findings demonstrate that Na+ transporter HKT1;2 protects the flower against Na+ toxicity and mitigates the reduction in tomato fruit yield under salinity conditions.
PB Elsevier
SN 0981-9428
YR 2020
FD 2020
LK http://hdl.handle.net/20.500.11939/6681
UL http://hdl.handle.net/20.500.11939/6681
LA en
NO Romero-Aranda, M. R., Fernández, P. G., López-Tienda, J. R., López-Diaz, M. R., Espinosa, J., Granum, E., ... & Asins, M. J. (2020). Na+ transporter HKT1; 2 reduces flower Na+ content and considerably mitigates the decline in tomato fruit yields under saline conditions. Plant Physiology and Biochemistry. 154, 341-352.
DS MINDS@UW
RD May 18, 2022