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  • New insights into light integrating strigolactone signaling to regulate branching
    Author: Click: Apr 23, 20
     
      

    Recently, researchers from Biotechnology Research Institute (BRI) of Chinese Academy of Agricultural Sciences (CAAS), in collaboration with South China Agricultural University, reported their research results in a paper entitled “Arabidopsis FHY3 and FAR1 integrate light and strigolactone signaling to regulate branching” published in the internationally reputed journal “Nature Communications”.
    Branching/ tillering is an important parameter of plant architecture and is tightly regulated by both internal factors (such as plant hormones) and external factors (such as light conditions). How the various signaling pathways converge to coordinately regulate branching is not well understood. Here, we report that in Arabidopsis, FHY3 and FAR1, two homologous transcription factors essential for phytochrome A-mediated light signaling, and SMXL6/SMXL7/SMXL8, three key repressors of the strigolactone (SL) signaling pathway, directly interact with SPL9 and SPL15 and suppress their transcriptional activation of BRC1, a key repressor of branching, thus promoting branching. In addition, FHY3 and FAR1 also directly up-regulate the expression of SMXL6 and SMXL7 to promote branching. Simulated shade treatment reduces the accumulation of FHY3 protein, leading to increased expression of BRC1 and reduced branching. Our results establish an integrated model of light and SL coordinately regulating BRC1 expression and branching through converging at the BRC1 promoter and will have important implications for future design of crops with improved plant architecture and thus increased yields, particularly under high-density planting conditions.
    Figure: FHY3 and FAR1 integrate light and strigolactone signaling to regulate branching.


    Dr. Yurong Xie (Innovation Team of Maize Functional Genomics of BRI) is the first author of this research. Professor Haiyang Wang (South China Agricultural University) is the corresponding author. This research was funded by National Natural Science Foundation of China (31770210 and 31570191), National Key Research and Development Program of China (2016YFD0100303) and the Innovative Research Program of Agricultural Sciences of CAAS.
    More information can be found through the link:https://doi.org/10.1038/s41467-020-15893-7
     

     

     

    
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