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Related Experiment Videos

Low-temperature-responsive barley genes have different control mechanisms

M A Dunn1, N J Goddard, L Zhang

  • 1Department of Biochemistry and Genetics, Medical School, University of Newcastle upon Tyne, UK.

Plant Molecular Biology
|March 1, 1994
PubMed
Summary

Barley low-temperature-responsive (LTR) genes exhibit varied transcriptional and post-transcriptional regulation. Different LTR gene expression profiles fine-tune the cold acclimation response, with some genes also responding to drought stress.

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Area of Science:

  • Plant molecular biology
  • Gene expression regulation
  • Stress physiology

Background:

  • Several low-temperature-responsive (LTR) genes in barley accumulate high transcript levels.
  • Understanding the regulation of these LTR genes is crucial for comprehending plant cold acclimation.

Purpose of the Study:

  • To investigate the transcriptional and post-transcriptional regulation of barley LTR genes.
  • To analyze the expression patterns of specific LTR genes under varying temperatures and stress conditions.

Main Methods:

  • Run-on transcription assays were employed to differentiate between transcriptional and post-transcriptional regulation.
  • Expression studies involved analyzing the time course of transcript appearance and decay for selected LTR genes.

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Main Results:

  • Six barley LTR genes (blt 4/9, blt 101, blt 1015, blt 63, blt 49, blt 410) were found to be transcriptionally regulated.
  • Three LTR genes (blt 14, blt 411, blt 801) were identified as post-transcriptionally regulated.
  • Individual LTR transcripts displayed distinct temperature-dependent profiles, and no single gene fully correlated with cold acclimation. The blt 4/9 gene also responded to drought and nutrient stress, with drought inducing acclimation.

Conclusions:

  • Barley LTR gene expression is controlled by both transcriptional and post-transcriptional mechanisms.
  • Diverse expression profiles of LTR genes likely contribute to the fine-tuning of the plant's low-temperature response.
  • The blt 4/9 gene's response to multiple stresses suggests a role in broader stress adaptation, with drought having an acclimating effect.