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The putative plasma membrane Na+/H+ antiporter SOS1 controls long-distance Na+ transport in plants

AuthorsShi, Huazhong; Quintero, Francisco J. ; Pardo, José M. ; Zhu, Jian-Kang
Issue DateFeb-2002
PublisherAmerican Society of Plant Biologists
CitationPlant Cell 14 (2): 465-477 (2002).
AbstractThe salt tolerance locus SOS1 from Arabidopsis has been shown to encode a putative plasma membrane Na+/H+ antiporter. In this study, we examined the tissue-specific pattern of gene expression as well as the Na+ transport activity and subcellular localization of SOS1. When expressed in a yeast mutant deficient in endogenous Na+ transporters, SOS1 was able to reduce Na+ accumulation and improve salt tolerance of the mutant cells. Confocal imaging of a SOS1–green fluorescent protein fusion protein in transgenic Arabidopsis plants indicated that SOS1 is localized in the plasma membrane. Analysis of SOS1 promoter–β-glucuronidase transgenic Arabidopsis plants revealed preferential expression of SOS1 in epidermal cells at the root tip and in parenchyma cells at the xylem/symplast boundary of roots, stems, and leaves. Under mild salt stress (25 mM NaCl), sos1 mutant shoot accumulated less Na+ than did the wild-type shoot. However, under severe salt stress (100 mM NaCl), sos1 mutant plants accumulated more Na+ than did the wild type. There also was greater Na+ content in the xylem sap of sos1 mutant plants exposed to 100 mM NaCl. These results suggest that SOS1 is critical for controlling long-distance Na+ transport from root to shoot. We present a model in which SOS1 functions in retrieving Na+ from the xylem stream under severe salt stress, whereas under mild salt stress it may function in loading Na+ into the xylem.
Description13 pages, 10 figures, 39 references.
Publisher version (URL)http://dx.doi.org/10.1105/tpc.010371
DOIdoi: 10.1105/tpc.010371
Appears in Collections:(IRNAS) Artículos
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