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    National Tsing Hua University Institutional Repository > 生命科學院  > 生命科學系 > 期刊論文 >  Regulation of Arabidopsis thaliana Ku genes at different developmental stages under heat stress

    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/49044

    Title: Regulation of Arabidopsis thaliana Ku genes at different developmental stages under heat stress
    Authors: Liu PF;Wang YK;Chang WC;Chang HY;Pan RL
    教師: 張晃猷
    Date: 2008
    Publisher: Elsevier
    Relation: BIOCHIMICA ET BIOPHYSICA ACTA-GENE REGULATORY MECHANISMS,Elsevier,Volume 1779,Issue 6-7,JUN-JUL 2008,Pages 402-407
    Keywords: ABSCISIC-ACID
    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 realtime 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.
    URI: http://www.elsevier.com/
    Appears in Collections:[生命科學系] 期刊論文

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