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SsHKT1;1 is coordinated with SsSOS1 and SsNHX1 to regulate Na+ homeostasis in Suaeda salsa under saline conditions
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SsHKT1;1 is coordinated with SsSOS1 and SsNHX1 to regulate Na+ homeostasis in Suaeda salsa under saline conditions
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Journal Article
SsHKT1;1 is coordinated with SsSOS1 and SsNHX1 to regulate Na+ homeostasis in Suaeda salsa under saline conditions
2020
Overview
Background
Under saline conditions,
Suaeda salsa
, as a typical halophyte, accumulates large amounts of Na
+
in its leaves during optimal growth. Key transporters involved in Na
+
accumulation in plants are HKT-type protein, the plasma membrane Na
+
/H
+
transporter SOS1, and the tonoplast Na
+
/H
+
antiporter NHX1. In this study, the function of SsHKT1;1 and its coordinate expression with SsSOS1 and SsNHX1 to regulate Na
+
homeostasis in
S. salsa
was investigated.
Results
We showed, by yeast complementation assays, that
SsHKT1;1
encoded a Na
+
-selective transporter, which located to the plasma membrane and was preferentially expressed within the stele, and was particularly abundant in xylem parenchyma and pericycle cells. When compared with a treatment of 25 mM NaCl, 150 mM NaCl greatly decreased the transcripts of
SsHKT1;1
, but maintained a relatively constant level of the expression of
SsSOS1
in roots. Consequently, the synergistic effect of SsHKT1;1 and SsSOS1 would result in greater Na
+
loading into the xylem under 150 mM NaCl than 25 mM NaCl. In leaves, 150 mM NaCl up-regulated the abundance of
SsNHX1
compared with levels in 25 mM NaCl. This enabled the permanent sequestering of Na
+
into leaf vacuoles.
Conclusions
Overall, SsHKT1;1 functioned in reducing Na
+
retrieval from the root xylem, and played an important role in coordinating with SsSOS1 and SsNHX1 to maintain Na
+
accumulation in
S. salsa
under saline conditions.
