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PLANT PHYSIOLOGY , Vol 103, Issue 4 1047-1053, Copyright © 1993 by American Society of Plant Biologists
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MOLECULAR BIOLOGY AND GENE REGULATION |
Regulation of Arabidopsis thaliana L. (Heyn) cor78 in Response to Low Temperature
D. P. Horvath, B. K. McLarney and M. F. Thomashow
Department of Crop and Soil Sciences (M.F.T.), Program in Genetics (D.P.H., M.F.T.), and Department of Biochemistry (B.K.M.), Michigan State University, East Lansing, Michigan 48824
Changes in gene expression occur during cold acclimation in a variety of
plants including Arabidopsis thaliana L. (Heyn). Here we examine the
cold-regulated expression of A. thaliana cor78. The results of gene-fusion
experiments confirm the finding of Yamaguchi-Shinozaki and Shinozaki
([1993] Mol Gen Genet 236: 331-340) that the 5[prime] region of cor78 has
cis-acting regulatory elements that can impart cold-regulated gene
expression. Further, histochemical staining experiments indicated that this
cold-regulatory element(s) was active at low temperature throughout much of
the plant including leaves, stems, roots, flower petals, filaments, and
sepals. Time-course experiments indicated that the activity of the cor78
promoter in cold-acclimated plants was down-regulated quickly in response
to noninducing temperatures and that the half-life of the cor78 transcripts
was only about 40 min at normal growth temperature. Fusion of the entire
transcribed region of cor78 to the cauliflower mosaic virus 35S promoter
resulted in a chimeric gene that was constitutively expressed and displayed
little if any posttranscriptional regulation in response to low
temperature.
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