A JA-OsMYB72-OsTAM1 module promotes (R)-β-tyrosine-mediated lignin defense against brown planthopper in rice

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ID: 331708
2026
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Abstract
Brown planthopper (Nilaparvata lugens, BPH) is a major pest that severely limits rice production. Although plant defense against BPH involves complex metabolic and structural responses, the role of non-protein amino acids (NPAAs) in this process remains poorly understood. Here, we demonstrate that (R)-β-tyrosine functions as a key defense metabolite that enhances rice resistance to BPH. Exogenous application and genetic manipulation across different rice backgrounds revealed that (R)-β-tyrosine does not directly affect insect survival but instead acts through host-mediated mechanisms. Transcriptomic, histological, and physiological analyses showed that (R)-β-tyrosine promotes the expression of phenylpropanoid pathway genes, leading to increased lignin accumulation, enhanced mechanical strength, and reinforced physical barriers that restrict BPH feeding. Mechanistically, we identify the JA-inducible transcription factor OsMYB72 as a key activator of OsTAM1, the enzyme catalyzing β-tyrosine biosynthesis, thereby linking JA signaling to (R)-β-tyrosine accumulation. This JA-OsMYB72-OsTAM1 module coordinates β-tyrosine production with downstream phenylpropanoid metabolism, promoting lignin deposition and reinforcing structural defense against BPH. Together, our findings establish a link between NPAA metabolism and lignin-associated structural defense, offering insight into metabolite mediated plant resistance to piercing-sucking herbivores.
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Authors Mengyun Xu, Genxiang Bai, Yu He, Junru Long, Dongqian Li, Ping Li, Zepeng Chen, Zhongyan Yang, Jiayun Hu, Shaoqun Zhou, Jian Yan
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Journal Plant physiology and biochemistry : PPB
Year 2026
DOI
10.1093/plphys/kiag743
URL
https://doi.org/10.1093/plphys/kiag743
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