谷氨通过细胞壁重塑和代谢调节促进米中的耐受性
Muhammad Riaz1, Saddam Hussain2, Qurban Ali3
1Guangdong Engineering and Technology Center for Environmental Pollution Prevention and Control in Agricultural Producing Areas, College of Resources and Environment, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China.
Ecotoxicology and environmental safety
|June 25, 2025
概括
外源性谷氨酸 (GSH) 通过减少的积累和氧化应激来减轻米苗中的 (Al) 毒性. GSH改善了代谢和pectin修饰,增强了植物对酸性土壤中Al诱导的损伤的弹性.
科学领域:
- 植物科学 植物科学
- 环境毒理学环境毒理学
- 生物化学 生物化学
背景情况:
- (Al) 的毒性严重限制了植物的生长,特别是在酸性土壤中,离子的溶解度很高.
- 谷氨 (GSH) 是一种关键的抗氧化剂,已知可以减轻各种非生物压力,但其在缓解大米中Al毒性的作用尚未完全理解.
研究的目的:
- 研究外源GSH在Al压力下对苗的改善作用.
- 阐明GSH的保护作用背后的机制,重点关注Al分布,pectin修饰,抗氧化防御和代谢.
主要方法:
- 米苗接受了四种治疗:对照 (CK),GSH (50 μM),Al (100 μM AlCl3) 和GSH+Al (50 μM GSH + 100 μM AlCl3).这些治疗包括:
- 评估了对根/芽长度,叶绿素含量,积,脂质过氧化,pectin methylesterase (PME) 活性,pectin甲基化和代谢指标 (氨,酸,酸) 的影响.
主要成果:
- 的毒性降低了植物生长,叶绿素和代谢酶活性. 治疗GSH显著降低了根和芽中的Al含量,并减少了脂质过氧化.
- GSH+Al治疗抑制了Al在根尖 (53.73%) 和细胞壁 (34.61%),抑制了PME活动 (50.15%),并增加了pectin甲基化 (58.05%).
- GSH增强了酸度和代谢酶活动,在Al压力下改变了叶子中的和酸盐水平.
结论:
- 外源性GSH通过减少Al吸收和氧化损伤,有效地减轻米苗中的Al毒性.
- GSH的保护作用包括调节pectin结构和增强代谢,为改善受Al影响的土壤中的作物弹性提供了潜在的策略.
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