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Expression of heat shock proteins during development of barley

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Abstract

Barley heat shock proteins have been cloned, characterized by hybrid release translation and sequenced. Clones coding for proteins of 17, 18, 30, 32 and 70 kDa have been obtained. Out of these the 32 and 30 kDa proteins have been characterized as precursors to plastidic proteins of 26 kDa by posttranslational transport and by cDNA sequencing. The coding regions of these two transcribed genes are highly homologous.

Accumulation of the plastid HSP as well as of HSP 70 as well as their corresponding mRNAs has been studied in 2- to 6-day old seedlings and in the 7-day old barley leaf. The mRNA for all investigated proteins were only found after a heat shock; the mRNA levels increase towards the tip of the leaf and with development. Furthermore, under the conditions used the mRNAs for all investigated heat shock proteins accumulate in parallel.

Unexpectedly, both proteins, HSP 70 and HSP 26, are found by western blotting in the 2-day old control plants in the absence of any inducing heat shock. At later stages of development and in the leaf gradient only immunoreactivity with HSP 70 was observed. In contrast to the levels of their mRNAs the highest levels of HSP 30–26 and 70 have been observed in the basal segments indicating that translational control plays a role during HSP expression. Under severe heat shock a protein of 30 kDa is induced whose identity is not known but which reacts with the antibody to HSP 30–26 and might represent the accumulating precursors of the plastidic proteins.

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Abbreviations

ER:

endoplasmic reticulum

HS:

heat shock

HSP:

heat shock proteins

HSTF:

heat shock transcription factor

LHCP:

light-harvesting chlorophyll a/b protein

PAGE:

polyacrylamide gel electrophoresis

SSU:

small subunit of ribulose-1,5-bisphosphate carboxylase.

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Kruse, E., Liu, Z. & Kloppstech, K. Expression of heat shock proteins during development of barley. Plant Mol Biol 23, 111–122 (1993). https://doi.org/10.1007/BF00021424

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