ABA-mediated regulation of rice grain quality and seed dormancy via the NF-YB1-SLRL2-bHLH144 Module

Jin-Dong Wang, Jing Wang, Li-Chun Huang, Li-Jun Kan, Chu-Xin Wang, Min Xiong, Peng Zhou, Li-Hui Zhou, Chen Chen, Dong-Sheng Zhao, Xiao-Lei Fan, Chang-Quan Zhang, Yong Zhou, Lin Zhang, Qiao-Quan Liu () and Qian-Feng Li ()
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Jin-Dong Wang: Yangzhou University
Jing Wang: Yangzhou University
Li-Chun Huang: Yangzhou University
Li-Jun Kan: Yangzhou University
Chu-Xin Wang: Yangzhou University
Min Xiong: Yangzhou University
Peng Zhou: Yangzhou University
Li-Hui Zhou: Yangzhou University
Chen Chen: Yangzhou University
Dong-Sheng Zhao: Yangzhou University
Xiao-Lei Fan: Yangzhou University
Chang-Quan Zhang: Yangzhou University
Yong Zhou: Yangzhou University
Lin Zhang: Yangzhou University
Qiao-Quan Liu: Yangzhou University
Qian-Feng Li: Yangzhou University

Nature Communications, 2024, vol. 15, issue 1, 1-16

Abstract: Abstract Abscisic acid (ABA) plays a crucial role in promoting plant stress resistance and seed dormancy. However, how ABA regulates rice quality remains unclear. This study identifies a key transcription factor SLR1-like2 (SLRL2), which mediates the ABA-regulated amylose content (AC) of rice. Mechanistically, SLRL2 interacts with NF-YB1 to co-regulate Wx, a determinant of AC and rice quality. In contrast to SLR1, SLRL2 is ABA inducible but insensitive to GA. In addition, SLRL2 exhibits DNA-binding activity and directly regulates the expression of Wx, bHLH144 and MFT2. SLRL2 competes with NF-YC12 for interaction with NF-YB1. NF-YB1 also directly represses SLRL2 transcription. Genetic validation supports that SLRL2 functions downstream of NF-YB1 and bHLH144 in regulating rice AC. Thus, an NF-YB1-SLRL2-bHLH144 regulatory module is successfully revealed. Furthermore, SLRL2 regulates rice dormancy by modulating the expression of MFT2. In conclusion, this study revealed an ABA-responsive regulatory cascade that functions in both rice quality and seed dormancy.

Date: 2024
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DOI: 10.1038/s41467-024-48760-w

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