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PLANT PHYSIOLOGY , Vol 114, Issue 2 591-596, Copyright © 1997 by American Society of Plant Biologists
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WHOLE PLANT, ENVIRONMENTAL, AND STRESS PHYSIOLOGY |
Proline Accumulation and Salt-Stress-Induced Gene Expression in a Salt-Hypersensitive Mutant of Arabidopsis
J. Liu and J. K. Zhu
Department of Plant Sciences, University of Arizona, Tucson, Arizona 85721
The sos1 mutant of Arabidopsis thaliana is more than 20 times more
sensitive to NaCl stress than wild-type Arabidopsis. Because proline (Pro)
is generally thought to have an important role in plant salt tolerance, the
sos1 mutant and the wild type were compared with respect to their capacity
to accumulate Pro under NaCl stress, and sos1 mutant plants accumulated
more Pro than the wild type. The P5CS gene, which catalyzes the
rate-limiting step in Pro biosynthesis, is induced by salt stress to a
higher level in sos1 than in the wild type. Although a defective
high-affinity K uptake system in sos1 causes K deficiency and inhibits
growth in NaCl-treated plants, this decrease is not a sufficient signal for
Pro accumulation and P5CS gene expression. Not all salt-stress-induced
genes have a higher level of expression in sos1. The expression levels of
AtPLC and RD29A, which encode a phospholipase C homolog and a putative
protective protein, respectively, are the same in sos1 as in the wild type.
However, the expression of AtMYB, which encodes a putative transcriptional
factor, is induced to a much higher level by salt stress in sos1. Thus, the
SOS1 gene product serves as a negative regulator for the expression of P5CS
and AtMYB, but has no effect on AtPLC and RD29A expression.
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