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PLANT PHYSIOLOGY , Vol 113, Issue 3 795-799, Copyright © 1997 by American Society of Plant Biologists
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WHOLE PLANT, ENVIRONMENTAL, AND STRESS PHYSIOLOGY |
Reduced Na+ Uptake in the NaCl-Hypersensitive sos1 Mutant of Arabidopsis thaliana
L. Ding and J. K. Zhu
Department of Plant Sciences, University of Arizona, Tucson, Arizona 85721
sos1 is an Arabidopsis thaliana mutant with >20 times higher sensitivity
toward Na+ inhibition due to a defective high-affinity potassium-uptake
system. We report here that sos1 accumulates less Na+ than the wild type in
response to NaCl stress. The Na+ contents in sos1 seedlings exposed to 25
mM NaCl for 2 or more d are about 43% lower than those in the wild type.
When assayed at 20 mM external NaCl, sos1 seedlings pretreated with low
potassium have 32% lower Na+ uptake than the wild type. However, little
difference in Na+ uptake could be measured when the seedlings were not
pretreated with low potassium. Low-potassium treatment was shown to induce
high-affinity potassium-uptake activity in Arabidopsis seedlings. No
substantial difference in Na+ efflux between sos1 and the wild type was
detected. The results show that the reduced Na+ accumulation in sos1 is due
to a lower Na+ influx rate. Therefore, the sos1 mutation appears to disrupt
low-affinity Na+ uptake in addition to its impairment of high-affinity K+
uptake.
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