Transcriptional regulation of strigolactone signalling in Arabidopsis

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 and Jiayang Li ()
Additional contact information
Lei Wang: Innovation Academy for Seed Design, Chinese Academy of Sciences
Bing Wang: Innovation Academy for Seed Design, Chinese Academy of Sciences
Hong Yu: Innovation Academy for Seed Design, Chinese Academy of Sciences
Hongyan Guo: Innovation Academy for Seed Design, Chinese Academy of Sciences
Tao Lin: Innovation Academy for Seed Design, Chinese Academy of Sciences
Liquan Kou: Innovation Academy for Seed Design, Chinese Academy of Sciences
Anqi Wang: Innovation Academy for Seed Design, Chinese Academy of Sciences
Ning Shao: Innovation Academy for Seed Design, Chinese Academy of Sciences
Haiyan Ma: Innovation Academy for Seed Design, Chinese Academy of Sciences
Guosheng Xiong: Chinese Academy of Agricultural Sciences
Xiaoqiang Li: Chinese Academy of Sciences
Jun Yang: Chinese Academy of Sciences
Jinfang Chu: Innovation Academy for Seed Design, Chinese Academy of Sciences
Jiayang Li: Innovation Academy for Seed Design, Chinese Academy of Sciences

Nature, 2020, vol. 583, issue 7815, 277-281

Abstract: 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.

Date: 2020
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DOI: 10.1038/s41586-020-2382-x

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