GhUBC10-2 mediates GhGSTU17 degradation to regulate salt tolerance in cotton (Gossypium hirsutum)

文献类型： 外文期刊

第一作者： Sun, Yaru

作者： Sun, Yaru;Tian, Zailong;Zuo, Dongyun;Wang, Qiaolian;Song, Guoli;Tian, Zailong;Song, Guoli;Song, Guoli;Song, Guoli

作者机构：

关键词： GhWRKY13; salt stress; ubiquitination

期刊名称：PLANT CELL AND ENVIRONMENT （ 影响因子：7.3； 五年影响因子：8.1 ）

ISSN： 0140-7791

年卷期： 2024 年 47 卷 5 期

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收录情况： SCI

摘要： Ubiquitin-conjugating enzyme (UBC) is a crucial component of the ubiquitin-proteasome system, which contributes to plant growth and development. While some UBCs have been identified as potential regulators of abiotic stress responses, the underlying mechanisms of this regulation remain poorly understood. Here, we report a cotton (Gossypium hirsutum) UBC gene, GhUBC10-2, which negatively regulates the salt stress response. We found that the gain of function of GhUBC10-2 in both Arabidopsis (Arabidopsis thaliana) and cotton leads to reduced salinity tolerance. Additionally, GhUBC10-2 interacts with glutathione S-transferase (GST) U17 (GhGSTU17), forming a heterodimeric complex that promotes GhGSTU17 degradation. Intriguingly, GhUBC10-2 can be self-polyubiquitinated, suggesting that it possesses E3-independent activity. Our findings provide new insights into the PTM of plant GST-mediated salt response pathways. Furthermore, we found that the WRKY transcription factor GhWRKY13 binds to the GhUBC10-2 promoter and suppresses its expression under salt conditions. Collectively, our study unveils a regulatory module encompassing GhWRKY13-GhUBC10-2-GhGSTU17, which orchestrates the modulation of reactive oxygen species homeostasis to enhance salt tolerance.

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