Plant Physiology 96:1048-1052 (1991)
© 1991 American Society of Plant Biologists
Environmental and Stress Physiology
Heat Shock Causes Selective Destabilization of Secretory Protein mRNAs in Barley Aleurone Cells 1
Mark R. Brodl2 and
Tuan-hua David Ho
Department of Biology and Plant Biology Program, Washington University, St. Louis, Missouri 63130,
Division of Biology and Biomedical Sciences, Washington University, St. Louis, Missouri 63130
The aleurone layer of GA3-stimulated barley (Hordeum vulgare L., cv Himalaya) grains is normally devoted to the synthesis and secretion of hydrolytic enzymes. Heat shock, however, suppresses the synthesis of the main hydrolytic enzyme,  -amylase, by destabilizing its otherwise highly stable mRNA (FC Belanger, MR Brodl, T-hD Ho [1986] Proc Natl Acad Sci USA 83: 1354-1358). In this paper we document that heat shock causes the suppression of the synthesis of some normal cellular proteins, while the synthesis of other normal cellular proteins is unaffected by heat shock. There are two major isozymic forms of -amylase encoded by distinct mRNAs. The mRNA levels for both isozymic forms and the mRNA levels of two other secretory proteins, a protease and an endochitinase, were markedly reduced during heat shock. However, the levels of actin and  -tubulin mRNAs, both nonsecretory proteins, were not diminished during heat shock. In addition, the levels of three other mRNA species detected by a set of unidentified cDNA clones (the sequence of one shows that it lacks a signal sequence) remained unchanged during heat shock. These data indicate that there are two classes of normal cellular protein mRNAs with regard to the effect of heat shock upon their persistence in the cell, and suggest that the distinction between them is whether or not they encode secretory proteins.
2 Present address: Department of Biology, Knox College, Galesburg, IL 61401.
1 This research was supported by National Science Foundation grants DCB-83166 and DCB-8702299.
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