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PLANT PHYSIOLOGY , Vol 104, Issue 2 439-444, Copyright © 1994 by American Society of Plant Biologists
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MOLECULAR BIOLOGY AND GENE REGULATION |
Sucrose Modulation of Soybean Vsp Gene Expression Is Inhibited by Auxin
D. B. DeWald, A. Sadka and J. E. Mullet
Department of Biochemistry and Biophysics, Texas A&M University, College Station, Texas 77843
We have shown that auxin represses soybean (Glycine max L.) vegetative
storage protein gene (Vsp) expression in suspension-cultured cells and in
leaves and petioles of excised trifoliates. The auxin analog
naphthyleneacetic acid (NAA) at 10 [mu]M strongly inhibited methyl
jasmonate-induced Vsp expression in soybean suspension-cultured cells. Both
indole-3-acetic acid and NAA inhibited methyl jasmonate- and wound-induced
expression of the Vsp and LoxA excised soybean trifoliate leaves and
petioles. The less active auxin analog phenylacetic acid had less effect on
methyl jasmonate- and wound-induced expression of these genes. Addition of
cytokinin to alter the auxin:cytokinin ratio did not reverse auxin
inhibition of Vsp expression. Transcription of [beta]-glucuronidase (Gus)
modulated by a methyl jasmonate-responsive domain derived from the VspB
promoter was minimally influenced by auxin. In contract, sucrose-induced
expression of Gus mediated by a sucrose-responsive domain of the VspB
promoter was strongly inhibited by NAA. We conclude that auxin inhibits Vsp
mRNA accumulation, in part, by repressing sugar-mediated activation of Vsp
expression.
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