The F‐box protein <scp>RCN127</scp> enhances rice tillering and grain yield by mediating the degradation of <scp>OsTB1</scp> and <scp>OsTCP19</scp>

Tillering ability is a crucial agronomic trait that determines rice yield potential. OsTB1 (the rice ortholog of TEOSINTE BRANCHED 1) and OsTCP19 of the TCP protein family are two key repressors of rice tillering. Until now, their post-translational regulatory mechanisms have remained elusive. In this study, we identified the F-box protein RCN127 as a novel post-translational regulator that promotes rice tillering by targeting them for degradation. The rcn127 mutant exhibits reduced tillering. The target gene RCN127 encodes an F-box protein that localizes in both the nucleus and cytoplasm, with higher expression levels in roots, stem bases, and young panicles. We demonstrate that RCN127 physically interacts with both OsTB1 and OsTCP19, mediating their ubiquitination and subsequent degradation via the 26S proteasome pathway. This reduction in OsTB1 and OsTCP19 protein levels weakens their suppression on tillering, leading to significantly increased tiller numbers. Importantly, RCN127-mediated regulation enhances grain yield in both the model variety Nipponbare and the dominant cultivated variety LJ31, providing a promising strategy for yield improvement. Therefore, our study unveils a novel post-translational regulatory mechanism of TCP protein family, providing a new strategy to increase grain yield by enhancing rice tillering capacity.

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Publication Details

Journal
Plant Biotechnology Journal
Published
2025-06-09
DOI
https://doi.org/10.1111/pbi.70180
Citations
2
Primary Topic
Plant Molecular Biology Research
Type
article
Field-Weighted Citation Impact
3.50

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article

The F‐box protein RCN127 enhances rice tillering and grain yield by mediating the degradation of OsTB1 and OsTCP19

Zhichao Zhao, Sheng Luo, Miao Feng, Zhijun Cheng et al.
2 citations
Plant Biotechnology Journal
Plant Molecular Biology Research
3.50
article

The F‐box protein RCN127 enhances rice tillering and grain yield by mediating the degradation of OsTB1 and OsTCP19

Zhichao Zhao, Sheng Luo, Miao Feng, Zhijun Cheng, Shanshan Zhu, Ling Jiang, Yulong Ren, Rong Miao, Yiqi Luo, Cailin Lei, Jian Wang, Jianmin Wan, Xin Liu, Shuai Li, Tong Luo, Jinsheng Qian, Xin Wang, Qibing Lin, Yimin Ling, Wenfan Luo, Chunlei Zhou, Bin Lei, Jiale Shao
article en
2 citations

Abstract

Tillering ability is a crucial agronomic trait that determines rice yield potential. OsTB1 (the rice ortholog of TEOSINTE BRANCHED 1) and OsTCP19 of the TCP protein family are two key repressors of rice tillering. Until now, their post-translational regulatory mechanisms have remained elusive. In this study, we identified the F-box protein RCN127 as a novel post-translational regulator that promotes rice tillering by targeting them for degradation. The rcn127 mutant exhibits reduced tillering. The target gene RCN127 encodes an F-box protein that localizes in both the nucleus and cytoplasm, with higher expression levels in roots, stem bases, and young panicles. We demonstrate that RCN127 physically interacts with both OsTB1 and OsTCP19, mediating their ubiquitination and subsequent degradation via the 26S proteasome pathway. This reduction in OsTB1 and OsTCP19 protein levels weakens their suppression on tillering, leading to significantly increased tiller numbers. Importantly, RCN127-mediated regulation enhances grain yield in both the model variety Nipponbare and the dominant cultivated variety LJ31, providing a promising strategy for yield improvement. Therefore, our study unveils a novel post-translational regulatory mechanism of TCP protein family, providing a new strategy to increase grain yield by enhancing rice tillering capacity.

Plant Biotechnology JournalVol. 23(9)
Nanjing Agricultural University (CN), Chinese Academy of Agricultural Sciences (CN), Institute of Crop Sciences (CN)
National Natural Science Foundation of China, Chinese Academy of Agricultural Sciences, National Science and Technology Major Project
Zero hunger
Openalex Percentile: Top 8%
Plant Molecular Biology Research
3.50
DOIOpen Access PDFOpenAlex
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