Huang Danlian, Gong Xiaomin, Liu Yunguo, Zeng Guangming, Lai Cui, Bashir Hassan, Zhou Lu, Wang Dafei, Xu Piao, Cheng Min, Wan Jia
College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China.
Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha, 410082, China.
Planta. 2017 May;245(5):863-873. doi: 10.1007/s00425-017-2664-1. Epub 2017 Feb 15.
This review provides new insight that calcium plays important roles in plant growth, heavy metal accumulation and translocation, photosynthesis, oxidative damage and signal transduction under cadmium stress. Increasing heavy metal pollution problems have raised word-wide concerns. Cadmium (Cd), being a highly toxic metal, poses potential risks both to ecosystems and human health. Compared with conventional technologies, phytoremediation, being cost-efficient, highly stable and environment-friendly, is believed to be a promising green technology for Cd decontamination. However, Cd can be easily taken up by plants and may cause severe phytotoxicity to plants, thus limiting the efficiency of phytoremediation. Various researches are being done to investigate the effects of exogenous substances on the mitigation of Cd toxicity to plants. Calcium (Ca) is an essential plant macronutrient that involved in various plant physiological processes, such as plant growth and development, cell division, cytoplasmic streaming, photosynthesis and intracellular signaling transduction. Due to the chemical similarity between Ca and Cd, Ca may mediate Cd-induced physiological or metabolic changes in plants. Recent studies have shown that Ca could be used as an exogenous substance to protect plants against Cd stress by the alleviation of growth inhibition, regulation of metal uptake and translocation, improvement of photosynthesis, mitigation of oxidative damages and the control of signal transduction in the plants. The effects of Ca on toxic concentrations of Cd in plants are reviewed. This review also provides new insight that plants with enhanced Ca level have improved resistance to Cd stress.
本综述提供了新的见解，即钙在镉胁迫下对植物生长、重金属积累与转运、光合作用、氧化损伤及信号转导中发挥着重要作用。日益严重的重金属污染问题已引起全球关注。镉（Cd）作为一种剧毒金属，对生态系统和人类健康均构成潜在风险。与传统技术相比，植物修复成本低、稳定性高且环境友好，被认为是一种很有前景的镉污染治理绿色技术。然而，镉很容易被植物吸收，并可能对植物造成严重的毒害作用，从而限制了植物修复的效率。目前正在开展各种研究，以探究外源物质对减轻镉对植物毒性的影响。钙（Ca）是植物必需的大量元素，参与植物的各种生理过程，如植物生长发育、细胞分裂、胞质环流、光合作用及细胞内信号转导。由于钙和镉在化学性质上相似，钙可能介导植物中镉诱导的生理或代谢变化。最近的研究表明，钙可作为一种外源物质，通过缓解生长抑制、调节金属吸收与转运、改善光合作用、减轻氧化损伤以及控制植物中的信号转导来保护植物免受镉胁迫。本文综述了钙对植物中镉毒性浓度的影响。本综述还提供了新的见解，即钙水平提高的植物对镉胁迫的抗性增强。
