Chinese Bulletin of Botany ›› 2020, Vol. 55 ›› Issue (4): 397-402.DOI: 10.11983/CBB20099

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New Insight into Strigolactone Signaling

Ruifeng Yao1,*(),Daoxin Xie2,*()   

  1. 1Hunan Provincial Key Laboratory of Plant Functional Genomics and Developmental Regulation, State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Biology, Hunan University, Changsha 410082, China
    2Ministry of Education Key Laboratory of Bioinformatics, Tsinghua-Peking Joint Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing 100084, China
  • Received:2020-05-28 Accepted:2020-06-02 Online:2020-07-01 Published:2020-06-11
  • Contact: Ruifeng Yao,Daoxin Xie

Abstract: It is well-known that DELLA, AUX/IAA, JAZ and D53/SMXL act as repressor proteins that bind and repress transcription factors to suppress expression of hormone-responsive genes, while hormone molecules trigger signal transduction to induce degradation of these repressor proteins and eventually activate expression of hormone-responsive genes essential for various biological processes. The research team led by Dr. Jiayang Li recently reported that SMXL6, SMXL7 and SMXL8 (SMXL6,7,8) in strigolactone (SL) signaling pathway serve as dual-function repressor proteins which act as both repressors and transcription factors. They found that SMXL6,7,8 can function as transcription factors by directly binding to the promoters of SMXL6,7,8 genes and repressing their expression. In addition, they identified a large number of novel SL-responsive genes, and revealed molecular mechanisms underlying how SL regulates shoot branching, leaf elongation and anthocyanin biosynthesis. These important findings provide new insights into our understanding of plant hormone action, which are scientifically significant and agriculturally important.

Key words: phytohormone, strigolactone, repressor, transcription factor, dual functions, negative feedback regulation