皮拉米达D-乳酸脱酶与glyoxalase途径增强了植物中的非生物应激耐受性
Nazmir Binta Alam1, Muskan Jain1, Ananda Mustafiz1
1Plant Molecular Biology Laboratory, Faculty of Life Sciences and Biotechnology, South Asian University, New Delhi, 110068, India.
Plant physiology and biochemistry : PPB
|February 3, 2024
概括
与只有GLYI和GLLYII过度表达的植物相比,经过工程改造以过度表达甘氨酸酶I (GLYI),甘氨酸酶II (GLYII) 和D-乳酸脱酶 (D-LDH) 的植物表现出改善的甲基甘氨酸 (MG) 排毒和增强的非生物应激耐受性.
科学领域:
- 植物科学 植物科学
- 生物化学 生化学
- 压力生理学 压力生理学
背景情况:
- 甲基醇 (MG) 是一种在植物应激过程中产生的细胞毒性代谢物.
- 氧酶途径,涉及氧酶I (GLYI) 和氧酶II (GLYII),可以排毒MG.
- D-乳酸脱酶 (D-LDH) 代谢D-乳酸盐,这是该途径的最终产物.
研究的目的:
- 研究GLYI,GLYII和D-LDH过度表达对MG排毒和Abidopsis中的非生物应激耐受性的联合作用.
- 探索工程工厂中潜在的耐压机制.
主要方法:
- 用于创建过度表达GLYI+GLYII和GLYI+GLYII+D-LDH的Arabidopsis转基因线的基因金字塔化技术.
- 测量MG和D-乳酸盐的水平.
- 对非生物应激耐力的分析.
- 对应激基因和植物激素的基因表达分析.
主要成果:
- 与G-I+II和野生型植物相比,GLYI+GLYII+D-LDH过度表达的植物 (G-I+II+D) 的MG和D-乳酸盐水平明显较低.
- G-I+II+D植物对非生物压力的耐受性提高.
- 在压力下的G-I+II+D植物中观察到ABA依赖的应激反应基因 (RAB18,RD22,RD29B) 和特定转录 (STY46,GPX3,CAMTA1) 的表达增加.
结论:
- 过度表达GLYI,GLYII和D-LDH可以协同增强植物中的甲基氧解毒和非生物应激耐受性.
- 这项研究表明,ABA信号传递和MG解毒途径之间存在潜在的相关性.
- 工程植物拥有改善的保护机制,可以抵抗氧化应激和非生物应激.
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