title: Constitutive high-level SOS1 expression and absence of HKT1;1 expression in the salt-accumulating halophyte Salicornia dolichostachya.
abstract: We investigated the effects of salinity on ion accumulation and expression of candidate salt tolerance genes in the highly tolerant salt accumulating halophyte Salicornia dolichostachya and the taxonomically related glycophytic Spinacia oleracea. S. dolichostachya, in comparison with S. oleracea, constitutively expressed SOS1 at a high level, but did not detectably express HKT1;1. These findings suggest that the constitutive high level of shoot salt accumulation in S. dolichostachya is accomplished through enhancement of SOS1-mediated Na(+) xylem loading, in combination with complete suppression of HKT1;1-mediated Na(+) retrieval from the xylem. Our findings demonstrate the importance of gene expression comparisons between highly tolerant halophytes and taxonomically related glycophytes to improve the understanding of mechanisms of Na(+) movement and salt tolerance in plants.
authors: Systems Ecology, Department of Ecological Science, Faculty of Earth and Life Sciences, VU University Amsterdam, De Boelelaan 1085, 1081 HV Amsterdam, The Netherlands. Electronic address: katschnig.d@gmail.com.
authors: D
authors: D
authors: Katschnig
authors: Department of Genetics, Faculty of Earth and Life Sciences, VU University Amsterdam, De Boelelaan 1085, 1081 HV Amsterdam, The Netherlands. Electronic address: m.bliek@vu.nl.
authors: T
authors: T
authors: Bliek
authors: Systems Ecology, Department of Ecological Science, Faculty of Earth and Life Sciences, VU University Amsterdam, De Boelelaan 1085, 1081 HV Amsterdam, The Netherlands. Electronic address: j.rozema@vu.nl.
authors: J
authors: J
authors: Rozema
authors: Department of Genetics, Faculty of Earth and Life Sciences, VU University Amsterdam, De Boelelaan 1085, 1081 HV Amsterdam, The Netherlands. Electronic address: h.schat@vu.nl.
authors: H
authors: H
authors: Schat
mesh_terms: D027682:Cation Transport Proteins / Q000235:genetics* / Q000378:metabolism; D019663:Chenopodiaceae / Q000187:drug effects / Q000235:genetics / Q000378:metabolism*; D010940:Plant Proteins / Q000235:genetics* / Q000378:metabolism; D018517:Plant Roots / Q000378:metabolism; D030821:Plants, Genetically Modified; D020837:SOS1 Protein / Q000235:genetics* / Q000378:metabolism; D054712:Salinity; D055049:Salt Tolerance; D012964:Sodium / Q000378:metabolism; D012965:Sodium Chloride / Q000494:pharmacology*; D017923:Sodium-Hydrogen Exchangers / Q000235:genetics; D027981:Symporters / Q000235:genetics* / Q000378:metabolism; D052584:Xylem / Q000187:drug effects / Q000235:genetics / Q000378:metabolism
chemical_list: D027682:Cation Transport Proteins; C088864:HKT1 protein, plant; D010940:Plant Proteins; D020837:SOS1 Protein; D017923:Sodium-Hydrogen Exchangers; D027981:Symporters; D012965:Sodium Chloride; D012964:Sodium
keywords: Gene expression; HKT1; Halophyte; SOS1; Salicornia; Salt tolerance