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PLANT PHYSIOLOGY , Vol 101, Issue 1 209-216, Copyright © 1993 by American Society of Plant Biologists
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MOLECULAR BIOLOGY AND GENE REGULATION |
Stress Responses and Metabolic Regulation of Glyceraldehyde-3-Phosphate Dehydrogenase Genes in Arabidopsis
Y. Yang, H. B. Kwon, H. P. Peng and M. C. Shih
Department of Biological Sciences, University of Iowa, Iowa City, Iowa 52242
We report here effects of three environmental conditions, heat shock,
anaerobic treatment, and carbon source supply, on expression of nuclear
genes encoding chloroplast (GapA and GapB) and cytosolic (GapC)
glyceraldehyde-3-phosphate dehydrogenase from Arabidopsis thaliana. The
steady-state mRNA level of the GapC increased when Arabidopsis plants were
transferred from normal growth condition to heat-shock, anaerobiosis, or
increased sucrose supply conditions. In contrast, the steady-state mRNA
levels for GapA and GapB genes were unaffected or decreased transiently
under the same treatments. To identify the cis-acting regulatory elements,
transgenic tobacco plants containing a 820-bp GapC 5[prime]-flanking DNA
fragment and [beta]-glucoronidase(Gus) fusion were constructed. Analyses of
these transgenic plants indicate that this 820-bp DNA fragment is
sufficient to confer both heat-shock and anaerobic responses. These results
suggest that transcriptional level control is involved in regulation of
GapC expression under these stress conditions. Histochemical analysis of
Gus activity indicates that expression of the GapC is cell-type specific
and is probably linked to the metabolic activity of the cells.
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