外源性谷氨通过促进抗氧化能力和激活黄生物合成途径,提高了帕丘利的盐分耐受性
Heqin Yan1, Yating Su1, Jieyun Fang1
1School of Breeding and Multiplication (Sanya Institute of Breeding and Multiplication), School of Tropical Agriculture and Forestry, Hainan University, Sanya 572025, China.
Plants (Basel, Switzerland)
|February 13, 2026
概括
谷氨 (GSH) 通过增强抗氧化防御和激活黄类生物合成,改善生长和光合作用效率,增强药用植物对盐应激的抵抗力.
科学领域:
- 植物生理学 植物生理学
- 生物化学 生物化学
- 分子生物学分子生物学
背景情况:
- 盐应激严重影响药用植物的生长,产量和质量.
- 众所周知,一种主要的抗氧化三类抗氧化剂 - - 谷氨酸 (GSH) 能够使植物对盐度压力有弹性.
- 通过GSH提高盐分耐受性的精确机制,特别是在Pogostemon cablin等药用植物中,需要进一步阐明.
研究的目的:
- 调查外源性谷氨 (GSH) 对受到盐应激的Pogostemon cablin幼苗的调节作用.
- 为了阐明在P. cablin中由GSH介导的盐耐受性背后的分子机制.
- 评估GSH对植物生长,光合作用效率,抗氧化系统和二次代谢物产生的影响.
主要方法:
- 在正常和盐应激条件下用外源GSH对P. cablin幼苗的处理.
- 评估生理参数,包括植物生长,叶绿素含量和光合作用效率 (Fv/Fm, Y(II)).
- 测量抗氧化酶活性 (SOD,CAT,APX,POD,GR),非酶性抗氧化剂 (GSH,AsA) 和氧化损伤标记物 (甲,ROS).
- 分析二次代谢物含量 (总多,黄).
- RNA测序 (RNA-seq) 用于识别差异表达的基因,特别是在黄类生物合成途径中.
主要成果:
- 在正常和盐的条件下,GSH显著改善了P. cablin苗木的质量,增加了干重,植物高度和根长度.
- 通过增加叶绿素,胡卜素,Y,II和Fv/Fm,GSH保护了光合作用系统免受盐引起的损害.
- GSH刺激了抗氧化剂防御系统,提高了关键酶和抗氧化剂的调节,并减少了氧化应激标志物,如甲和ROS.
- GSH促进了二次代谢物的生物合成,特别是总多和黄.
- 在GSH应用后,RNA-seq分析显示了黄类生物合成途径 (例如,PAL,4CL,C4H,CHI,ANS,F3'H,CYP93) 中关键基因的显著上调.
结论:
- 外源的GSH有效地减轻了Pogostemon cablin中盐引起的氧化应激.
- 通过一种双重策略,GSH通过增强抗氧化剂防御系统和激活黄类生物合成来赋予盐分耐受性.
- 这些发现为GSH的保护作用提供了宝贵的见解,并突出了其在改善药用植物耐盐性方面的潜在应用.
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