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Transcriptional regulation of strigolactone signalling in Arabidopsis

机译：拟南芥中胞嘧啶信号传导调节

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摘要

Abstract Plant hormones known as strigolactones control plant development and interactions between host plants and symbiotic fungi or parasitic weeds1–4. In Arabidopsis thaliana and rice, the proteins DWARF14 (D14), MORE AXILLARY GROWTH 2 (MAX2), SUPPRESSOR OF MAX2-LIKE 6, 7 and 8 (SMXL6, SMXL7 and SMXL8) and their orthologues form a complex upon strigolactone perception and play a central part in strigolactone signalling5–10. However, whether and how strigolactones activate downstream transcription remains largely unknown. Here we use a synthetic strigolactone to identify 401 strigolactone-responsive genes in Arabidopsis, and show that these plant hormones regulate shoot branching, leaf shape and anthocyanin accumulation mainly through transcriptional activation of the BRANCHED 1, TCP DOMAIN PROTEIN 1 and PRODUCTION OF ANTHOCYANIN PIGMENT 1 genes. We find that SMXL6 targets 729 genes in the Arabidopsis genome and represses the transcription of SMXL6, SMXL7 and SMXL8 by binding directly to their promoters, showing that SMXL6 serves as an autoregulated transcription factor to maintain the homeostasis of strigolactone signalling. These findings reveal an unanticipated mechanism through which a transcriptional repressor of hormone signalling can directly recognize DNA and regulate transcription in higher plants.
机译：Abstract植物荷尔蒙称为杂皮内酯控制植物的开发和宿主植物和共生真菌或寄生杂草之间的相互作用。在拟南芥和水稻中，蛋白质Dwarf14（D14），更多的腋生生长2（MAX2），MAX2样6,7和8（SMX16，SMXL7和SMX18）及其矫形器形成杂志感知并发挥作用的复合物中枢部分滴漏标志标志5-10。但是，滴度如何以及如何激活下游转录仍然很大程度上是未知数。在这里，我们使用合成毒胞嘧啶来鉴定拟南芥中的401个棘作物响应基因，并表明这些植物激素主要通过分支1，TCP结构域蛋白1的转录激活来调节芽分支，叶形和花青素积累，以及花青素颜料1的生产1基因。我们发现SMXL6靶向拟南芥基因组中的729个基因，并通过直接结合到它们的启动子来抑制SMX16，SMX17和SMXL8的转录，表明SMX16用作自动调节的转录因子，以维持杂酮信号传导的稳态。这些发现揭示了一种意外的机制，激素信号传递的转录阻遏物可以直接识别DNA并调节高等植物中的转录。

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  • 来源
    《Nature》 |2020年第7815期|277-281|共5页
  • 作者

    Lei Wang; Bing Wang; Hong Yu; Hongyan Guo; Tao Lin; Liquan Kou; Anqi Wang; Ning Shao; Haiyan Ma; Guosheng Xiong; Xiaoqiang Li; Jun Yang; Jinfang Chu; Jiayang Li;

  • 作者单位

    Innovation Academy for Seed Design Chinese Academy of Sciences|Chinese Academy of Agricultural Sciences;

    Innovation Academy for Seed Design Chinese Academy of Sciences;

    Innovation Academy for Seed Design Chinese Academy of Sciences;

    Innovation Academy for Seed Design Chinese Academy of Sciences;

    Innovation Academy for Seed Design Chinese Academy of Sciences;

    Innovation Academy for Seed Design Chinese Academy of Sciences;

    Innovation Academy for Seed Design Chinese Academy of Sciences|University of Chinese Academy of Sciences;

    Innovation Academy for Seed Design Chinese Academy of Sciences;

    Innovation Academy for Seed Design Chinese Academy of Sciences;

    Chinese Academy of Agricultural Sciences|Nanjing Agricultural University;

    Chinese Academy of Sciences;

    Chinese Academy of Sciences;

    Innovation Academy for Seed Design Chinese Academy of Sciences|University of Chinese Academy of Sciences;

    Innovation Academy for Seed Design Chinese Academy of Sciences|University of Chinese Academy of Sciences;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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