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Different Cold-Signaling Pathways Function in the Responses to Rapid and Gradual Decreases in Temperature

机译:不同的冷信令途径在响应中的响应,在温度下快速且逐渐降低

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摘要

In plants, cold temperatures trigger stress responses and long-term responses that result in cold tolerance. In Arabidopsis thaliana, three dehydration-responsive element (DRE) binding protein 1/C-repeat binding factors (DREB1/CBFs) act as master switches in cold-responsive gene expression. Induction of DREB1 genes triggers the cold stress-inducible transcriptional cascade, followed by the induction of numerous genes that function in the cold stress response and cold tolerance. Many regulatory factors involved in DREB1 induction have been identified, but how these factors orchestrate the cold stress-specific expression of DREB1s has not yet been clarified. Here, we revealed that plants recognize cold stress as two different signals, rapid and gradual temperature decreases, and induce expression of the DREB1 genes. CALMODULIN BINDING TRANSCRIPTION ACTIVATOR3 (CAMTA3) and CAMTA5 respond to a rapid decrease in temperature and induce the expression of DREB1s, but these proteins do not respond to a gradual decrease in temperature. Moreover, they function during the day and night, in contrast to some key circadian components, including CIRCADIAN CLOCK ASSOCIATED1 and LATE ELONGATED HYPOCOTYL, which regulate cold-responsive DREB1 expression as transcriptional activators only during the day. Thus, plants efficiently control the acquisition of freezing tolerance using two different signaling pathways in response to a gradual temperature decrease during seasonal changes and a sudden temperature drop during the night.
机译:在植物中,低温会引发应激反应和长期反应,从而产生耐寒性。在拟南芥中,三个脱水反应元件(DRE)结合蛋白1/C-重复序列结合因子(DREB1/CBF)在冷反应基因表达中充当主开关。DREB1基因的诱导触发了冷应激诱导的转录级联反应,随后诱导了许多在冷应激反应和耐寒性中起作用的基因。许多与DREB1诱导有关的调节因素已经被确定,但这些因素如何协调DREB1的冷应激特异性表达尚不清楚。在这里,我们发现植物将冷胁迫识别为两种不同的信号,快速和逐渐的温度降低,并诱导DREB1基因的表达。钙调蛋白结合转录激活因子3(CAMTA3)和CAMTA5对温度的快速降低做出反应,并诱导DREB1s的表达,但这些蛋白质对温度的逐渐降低没有反应。此外,它们在白天和夜间发挥作用,与一些关键的昼夜节律成分相反,包括与昼夜节律相关的生物钟1和后期伸长的下胚轴,它们仅在白天作为转录激活剂调节冷反应DREB1的表达。因此,植物通过两种不同的信号途径有效地控制抗冻性的获得,以响应季节变化期间温度的逐渐下降和夜间温度的突然下降。

著录项

  • 来源
    《The Plant Cell》 |2017年第4期|共15页
  • 作者单位

    Univ Tokyo Grad Sch Agr &

    Life Sci Lab Plant Mol Physiol Bunkyo Ku Tokyo 1138657 Japan;

    Univ Tokyo Grad Sch Agr &

    Life Sci Lab Plant Mol Physiol Bunkyo Ku Tokyo 1138657 Japan;

    RIKEN Ctr Sustainable Resource Sci Gene Discovery Res Grp Yokohama Kanagawa 2300045 Japan;

    RIKEN Ctr Sustainable Resource Sci Gene Discovery Res Grp Yokohama Kanagawa 2300045 Japan;

    RIKEN Ctr Sustainable Resource Sci Gene Discovery Res Grp Yokohama Kanagawa 2300045 Japan;

    Univ Tokyo Grad Sch Agr &

    Life Sci Lab Plant Mol Physiol Bunkyo Ku Tokyo 1138657 Japan;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 植物细胞学;
  • 关键词

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