College of Animal Science and Technology, Yangzhou University, Yangzhou, 225009, China.
Joint International Research Laboratory of Agriculture and Agri-Product Safety of Ministry of Education of China, Yangzhou University, Yangzhou, 225009, China.
Environ Pollut. 2024 Nov 1;360:124711. doi: 10.1016/j.envpol.2024.124711. Epub 2024 Aug 10.
Cadmium (Cd) poses a significant threat to plant growth and the environment. Nano-FeO is effective in alleviating Cd stress in plants. Elymus nutans Griseb. is an important fodder crop on the Qinghai-Tibetan Plateau (QTP). However, the potential mechanism by which nano-FeO alleviates Cd stress in E. nutans is not well understood. E. nutans were subjected to single Cd, single nano-FeO, and co-treatment with nano-FeO and Cd, and the effects on morphology, Cd uptake, antioxidant enzyme activity, reactive oxygen species (ROS) levels and programmed cell death (PCD) were studied to clarify the regulatory mechanism of nano-FeO. The results showed that Cd stress significantly decreased the germination percentage and biomass of E. nutans. The photosynthetic pigment content decreased significantly under Cd stress. Cd stress also caused oxidative stress and lipid peroxidation, accumulation of excessive ROS, resulting in PCD, but the effect of nano-FeO was different. Seed germination, seedling growth, and physiological processes were analyzed to elucidate the regulatory role of nano-FeO nanoparticles in promoting photosynthesis, reducing Cd accumulation, scavenging ROS, and regulating PCD, to promote seed germination and seedling growth in E. nutans. This report provides a scientific basis for improving the tolerance of Elymus to Cd stress by using nano-FeO.
镉 (Cd) 对植物生长和环境构成重大威胁。纳米-FeO 可有效缓解植物的 Cd 胁迫。披碱草是青藏高原上的一种重要饲料作物。然而，纳米-FeO 缓解披碱草 Cd 胁迫的潜在机制尚不清楚。本研究采用单 Cd、单纳米-FeO 和纳米-FeO 和 Cd 共处理披碱草，研究其对形态、Cd 吸收、抗氧化酶活性、活性氧 (ROS) 水平和程序性细胞死亡 (PCD) 的影响，以阐明纳米-FeO 的调节机制。结果表明，Cd 胁迫显著降低了披碱草的发芽率和生物量。Cd 胁迫下光合色素含量显著降低。Cd 胁迫还导致氧化应激和脂质过氧化，ROS 积累过多，导致 PCD，但纳米-FeO 的作用不同。分析种子萌发、幼苗生长和生理过程，阐明纳米-FeO 纳米粒子在促进光合作用、减少 Cd 积累、清除 ROS 和调节 PCD 方面的调节作用，以促进披碱草种子的萌发和幼苗生长。本研究为利用纳米-FeO 提高披碱草对 Cd 胁迫的耐受性提供了科学依据。
