通过SC35介导的bZIP49拼接调节K+通道AKT1以适应树中的盐应激
Xiao Liu1,2,3, Yu Bao1,2,3, Man-Yu Zhang1,2,3
1State Key Laboratory of Tree Genetics and Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, China.
Nature communications
|August 6, 2025
概括
植物使用bZIP49拼接来管理盐应激. UBC32-SC35-bZIP49-AKT1通路调节的吸收,改善树木的盐分耐受性.
科学领域:
- 植物生物学 植物生物学
- 分子生物学分子生物学
- 生态生态学 生态生态学
背景情况:
- 土壤盐化对植物分布,作物产量和生态系统稳定性构成重大威胁.
- 植物利用 (K+) 信号来维持盐应激下的 (Na+/K+) 平衡,但对K+摄取调节的潜在机制尚未完全理解.
研究的目的:
- 研究bZIP49转录因子及其拼接变体在 (Populus tomentosa) 盐耐受性中的作用.
- 阐明控制K+吸收和Na+/K+在盐应激下恒温的调节机制.
主要方法:
- 在Populus tomentosa.中识别和描述bZIP49拼接变体 (bZIP49L和bZIP49S).
- 研究了SC35 (富有氨酸/氨酸的拼接因子) 在调节bZIP49拼接中的作用.
- 研究了bZIP49S,K+载体AKT1和E2无素结合酶UBC32.2之间的相互作用.
主要成果:
- 确定了两个bZIP49拼接变体,bZIP49L和bZIP49S;bZIP49S是盐应激下的活性形式.
- SC35调节bZIP49拼接,其过度表达增加了盐敏感性.
- bZIP49S抑制AKT1,而UBC32促进SC35降解,降低bZIP49S水平并增强K+吸收和盐耐受性.
结论:
- 这项研究揭示了一种新的调节模块 (UBC32-SC35-bZIP49-AKT1),对于调节盐应激下树中Na+/K+平衡至关重要.
- bZIP49剪接和随后的AKT1调节是改善植物盐分耐受性的关键.
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