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- Title
HKT1;1 and HKT1;2 Na + Transporters from Solanum galapagense Play Different Roles in the Plant Na + Distribution under Salinity.
- Authors
Asins, Maria J.; Romero-Aranda, Maria R.; Espinosa, Jesus; González-Fernández, Paloma; Jaime-Fernández, Emilio; Traverso, Jose A.; Carbonell, Emilio A.; Belver, Andres
- Abstract
Salt tolerance is a target trait in plant science and tomato breeding programs. Wild tomato accessions have been often explored for this purpose. Since shoot Na+/K+ is a key component of salt tolerance, RNAi-mediated knockdown isogenic lines obtained for Solanum galapagense alleles encoding both class I Na+ transporters HKT1;1 and HKT1;2 were used to investigate the silencing effects on the Na and K contents of the xylem sap, and source and sink organs of the scion, and their contribution to salt tolerance in all 16 rootstock/scion combinations of non-silenced and silenced lines, under two salinity treatments. The results show that SgHKT1;1 is operating differently from SgHKT1;2 regarding Na circulation in the tomato vascular system under salinity. A model was built to show that using silenced SgHKT1;1 line as rootstock would improve salt tolerance and fruit quality of varieties carrying the wild type SgHKT1;2 allele. Moreover, this increasing effect on both yield and fruit soluble solids content of silencing SgHKT1;1 could explain that a low expressing HKT1;1 variant was fixed in S. lycopersicum during domestication, and the paradox of increasing agronomic salt tolerance through silencing the HKT1;1 allele from S. galapagense, a salt adapted species.
- Subjects
SALINITY; TOMATO breeding; BOTANY; SOLANUM; XYLEM; FRUIT quality; ROOTSTOCKS
- Publication
International Journal of Molecular Sciences, 2022, Vol 23, Issue 9, p5130
- ISSN
1661-6596
- Publication type
Article
- DOI
10.3390/ijms23095130