Scholarlink

<p>The negative effects of heavy metal toxicity on crop growth and yield have become a global issue. Cadmium (Cd) is a harmful heavy metal that does not undergo redox reactions and increases the synthesis of reactive oxygen species (ROS), subsequently initiating cellular apoptosis. The primary goal of the current study was to examine the beneficial effects of priming seeds with polyethylene glycol (PEG) on the biochemical, morphological, and physiological characteristics of <i>Raphanus sativus</i> L. (radish) under Cd-spiked conditions. During this study, it was assumed that PEG has the potential to alleviate Cd stress. For this purpose, <i>R. sativus</i> seeds were primed with 10%, 20%, 30%, and 40% PEG solutions. The current study revealed that cadmium had toxic effects on diverse physiological mechanisms in plants, including photosynthesis, transpiration, and nutrient uptake. These effects ultimately lead to impaired growth and limited biomass accumulation. Cadmium exposure has been found to limit plant growth, diminish the content of photosynthetic pigments and soluble proteins, disrupt parameters concerning gaseous exchange, and increase the efficacy of a diverse spectrum of antioxidant enzymes such as peroxidases (POD), catalase (CAT), and superoxide dismutase (SOD). Moreover, experimental studies suggested that PEG increases proline, hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) and malondialdehyde (MDA) contents in treated <i>R. sativus</i> plants. Compared with those subjected to Cd-induced stress, the PEG-primed (PEG-30%) seeds presented notable increases in germination (71.59%) and photosynthetic rates (46.13%), as well as elevated rates of plant height (44.84%) and shoot fresh biomass production (59.61%) and an elevated metal tolerance index (MTI) by 57.34%. In summary, the findings of our study suggest that polyethylene glycol (PEG) application enhances the ability of plants to withstand stress by modulating the antioxidant system, and the observed properties of PEG position it as a promising protective agent for mitigating the adverse effects of Cd on plants and improving yield.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Polyethylene Glycol Mitigates Cadmium Toxicity in Raphanus sativus L. by Regulating Enzymatic and Nonenzymatic Antioxidant Defence Mechanisms

  • 期刊论文

  • 发表日期：

    2025年7月9日

查看全文
  • Muhammad Sajid,
  • Shakil Ahmed,
  • Rehana Sardar,
  • Nasim Ahmad Yasin

摘要

The negative effects of heavy metal toxicity on crop growth and yield have become a global issue. Cadmium (Cd) is a harmful heavy metal that does not undergo redox reactions and increases the synthesis of reactive oxygen species (ROS), subsequently initiating cellular apoptosis. The primary goal of the current study was to examine the beneficial effects of priming seeds with polyethylene glycol (PEG) on the biochemical, morphological, and physiological characteristics of Raphanus sativus L. (radish) under Cd-spiked conditions. During this study, it was assumed that PEG has the potential to alleviate Cd stress. For this purpose, R. sativus seeds were primed with 10%, 20%, 30%, and 40% PEG solutions. The current study revealed that cadmium had toxic effects on diverse physiological mechanisms in plants, including photosynthesis, transpiration, and nutrient uptake. These effects ultimately lead to impaired growth and limited biomass accumulation. Cadmium exposure has been found to limit plant growth, diminish the content of photosynthetic pigments and soluble proteins, disrupt parameters concerning gaseous exchange, and increase the efficacy of a diverse spectrum of antioxidant enzymes such as peroxidases (POD), catalase (CAT), and superoxide dismutase (SOD). Moreover, experimental studies suggested that PEG increases proline, hydrogen peroxide (H2O2) and malondialdehyde (MDA) contents in treated R. sativus plants. Compared with those subjected to Cd-induced stress, the PEG-primed (PEG-30%) seeds presented notable increases in germination (71.59%) and photosynthetic rates (46.13%), as well as elevated rates of plant height (44.84%) and shoot fresh biomass production (59.61%) and an elevated metal tolerance index (MTI) by 57.34%. In summary, the findings of our study suggest that polyethylene glycol (PEG) application enhances the ability of plants to withstand stress by modulating the antioxidant system, and the observed properties of PEG position it as a promising protective agent for mitigating the adverse effects of Cd on plants and improving yield.