Regulation of Arabidopsis thaliana Ku genes at different developmental stages under heat stress

Pei Feng Liu, Yung Kai Wang, Wen Chi Chang, Hwan You Chang, Rong Long Pan

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Ku, a heterodimeric protein consisting of 70- and 80-kDa subunits, is involved in many cellular processes, such as DNA replication, cell cycle regulation and heat shock response. Moreover, the expression of Arabidopsis thaliana Ku genes (AtKu) is modulated by certain plant hormones through several signal transduction pathways. This study investigated how AtKu are regulated by heat stress. AtKu expression in 3-week-old young seedlings was down-regulated by heat stress in a time-dependent manner, as examined using real-time quantitative PCR, GUS reporter systems, and western blotting analysis. Additionally, the heat-induced repression of AtKu was mediated through the abscisic acid (ABA) biosynthetic pathway, as shown by the reversal of AtKu suppression in the ABA biosynthesis mutant, aba3, and by an increase in the ABA level as analyzed by reverse-phase high performance liquid chromatography. Heat stress-induced regulation of AtKu repression also involved ethylene signaling, DNA repair pathways, and fatty acid synthesis. Furthermore, AtKu expression was repressed in stems, rosette leaves, and cauline leaves in 4-5-week-old plants under heat stress, whereas it remained unchanged in roots and primary inflorescence, indicating that heat differentially modulated AtKu expression in distinct tissues of Arabidopsis.

Original languageEnglish
Pages (from-to)402-407
Number of pages6
JournalBiochimica et Biophysica Acta - Gene Regulatory Mechanisms
Volume1779
Issue number6-7
DOIs
Publication statusPublished - 2008 Jun 1

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Structural Biology
  • Biochemistry
  • Molecular Biology
  • Genetics

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