氨基酸的应用通过调节pectin甲基化来抑制中国白菜中根到芽的转移
Longcheng Li1, Wenliang Wu2, Huiru Lin3
1Beijing Key Laboratory of Biodiversity and Organic Farming, College of Resources and Environmental Sciences, China Agricultural University, Beijing, 100193, China; Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Sciences, China Agricultural University, Beijing, 100193, China.
Plant physiology and biochemistry : PPB
|February 1, 2024
概括
氨酸 (Cys) 应用通过增加其在根细胞壁中的结合来减少中国白菜芽中的 (Cd). 这种机制涉及改变点的特性和减少Cd转位,减轻植物毒性.
科学领域:
- 植物生理学 植物生理学
- 环境毒理学环境毒理学
- 生物化学 生化学
背景情况:
- 外源氨基酸 (AAs) 可以通过改变其分布来减轻植物中的 (Cd) 毒性.
- 在中国白菜中,AA介导的细胞壁 (CW) 封存Cd的具体机制尚未完全理解.
研究的目的:
- 研究素 (Cys) 诱导的中国白菜根细胞壁中的结合的生理机制.
- 为了比较Cys和threonine (Thr) 对Cd分布和毒性的影响,在两种中国白菜基因型中.
主要方法:
- 在Cd压力下对Cd耐受性 (Jingcui 60) 和Cd敏感性 (16-7) 的中国白菜基因型的比较分析.
- 评估根结构,Cd亚细胞分布,CW组分和相关的基因表达.
- 在芽和根中的Cd度的量化,以及甲基酶 (PME) 活性和PMEI1基因表达的分析.
主要成果:
- Cys补充剂显著降低了两种基因型中的射击Cd度超过64%.
- Cys增加了根CW中的Cd化,减少了其在细胞质和细胞器中的存在,从而减轻了叶子化.
- Cys降低了PMEI1的表达和增强了PME活动,导致Cd在pectin中的保留增加.
结论:
- 氨酸的应用有效地减少了中国白菜中Cd从根到芽的转移.
- 该机制涉及通过PMEI1下调调节的介导,通过改变的pectin甲基化,在根CW中增强Cd封存.
- 氨酸的应用对Cd分布没有显著影响,突出显示了Cys作用的特异性.
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