Tomato SlNAC3 regulates proteostasis in response to early cold stress

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ID: 321033
2026
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Abstract
Cold stress poses a significant challenge to the tomato production. SlNAC3, a NAC transcription factor in tomato, plays a critical role in the early response to cold stress. However, only a few genes involved in ethylene biosynthesis were identified as NAC3-targets negatively regulating cold tolerance. This study investigated the mechanisms by which SlNAC3 influenced cold tolerance. RNA-seq analyses of SlNAC3 transient silencing and overexpression lines subjected to 2-hour cold stress revealed that SlNAC3 downregulated the ribosome pathway while upregulating the ubiquitin-proteasome system (UPS). Further analysis showed that SlNAC3 directly targeted genes involved in UPS, leading to the accumulation of ubiquitinated proteins and free amino acids. Additionally, SlNAC3 negatively regulated ribosomal protein expression, reducing soluble protein accumulation and impairing CBF protein levels under cold stress. Our findings suggest that the early induction of SlNAC3 likely activates CBF transcription, while constant high levels of SlNAC3 activates UPS, thus impaired CBF protein accumulation and tomato cold tolerance.
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openalex_W7168277786 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Lunda Wei, Ying Chen, Tao Wang, Miao Zhang, Yujia Ma, Xuemin Ma, Xinjun Zhang, Meilan Wu, Yuhan Qi, Junkai Wu, Zhuangsheng Wu, Daolong Liao, Yihan Dong, Wenna Zhang
Journal Plant physiology and biochemistry : PPB
Year 2026
DOI
10.1093/plphys/kiag501
URL
https://doi.org/10.1093/plphys/kiag501
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