ABSTRACT

Bioenergy plants that are better adapted to metal-contaminated lands can be used for phytoremediation purposes and also can be additionally used to produce biofuels such as bioethanol, biodiesel, and biogas. These plants offer the dual advantages of phytoremediation and bioenergy production and majority of them are heavy metal accumulators sequestering exceptionally high amount of the absorbed metals into their biomass. Although diverse heavy metal stress tolerance mechanisms are observed in plants, mainly the metals are effectively immobilized in the roots or if transported to shoots, metal ions are avoided from the sensitive sites and thereby protect the plants from toxicity of the metals. Owing to the fact that most of the reviews published earlier have been focusing on the production of biofuels from the biomass, mostly emphasizing on edible plants, in the present review the heavy metals immobilization mechanisms operational in non-edible bioenergy plants having phytoremediation potential is highlighted. Growing energy plants in heavy metal-contaminated lands is a means of sustainable utilization of the contaminated lands and it also prevents the entry of heavy metals into the food chain. This review, therefore, gives an overview of heavy metal accumulating non-edible bioenergy plants, benefits of using bioenergy plants for phytoremediation, metal tolerance mechanisms in these accumulators, and future perspectives.

抽象的

更好地适应金属污染土地的生物能源工厂可用于植物修复，也可用于生产生物燃料，例如生物乙醇，生物柴油和沼气。这些植物具有植物修复和生物能源生产的双重优势，其中大多数是重金属蓄积器，将大量吸收的金属螯合到生物质中。尽管在植物中观察到多种重金属胁迫耐受机制，但主要是金属被有效地固定在根中，或者如果被运输到芽上，则应避免从敏感部位吸收金属离子，从而保护植物免受金属毒性的影响。由于先前发表的大多数评论都集中在利用生物质生产生物燃料，本文主要强调可食用植物，在本综述中重点介绍了在具有植物修复潜力的不可食用生物能源植物中可利用的重金属固定化机制。在重金属污染土地上种植能源植物是对污染土地进行可持续利用的一种手段，它还可以防止重金属进入食物链。因此，本综述概述了重金属积累的非食用生物能源厂，使用生物能源厂进行植物修复的好处，这些蓄电池中的金属耐受机制以及未来的前景。在重金属污染土地上种植能源植物是对污染土地进行可持续利用的一种手段，它还可以防止重金属进入食物链。因此，本综述概述了重金属积累的非食用生物能源厂，使用生物能源厂进行植物修复的好处，这些蓄电池中的金属耐受机制以及未来的前景。在重金属污染土地上种植能源植物是对污染土地进行可持续利用的一种手段，它还可以防止重金属进入食物链。因此，本综述概述了重金属积累的非食用生物能源厂，使用生物能源厂进行植物修复的好处，这些蓄电池中的金属耐受机制以及未来的前景。