Endophytic bacteria and their potential to enhance heavy metal phytoextraction.
Endophytic bacteria and their potential to enhance heavy metal phytoextraction.
复制标题
DOI：
10.1016/j.chemosphere.2009.06.047
复制
发表时间：
2009-09
期刊：
影响因子：
8.8
通讯作者：
M. Rajkumar;N. Ae;H. Freitas
中科院分区：
文献类型：
--
作者：
M. Rajkumar;N. Ae;H. Freitas
土壤重金属污染已成为环境和人类健康最严重的危害之一。由于金属污染物的广泛存在，寻找新的方法来清除金属污染物已成为修复领域的优先事项。植物修复，即利用植物来恢复受污染物污染的环境，是一种相对较新的技术，比目前处理污染场地的工程解决方案更温和。最近，内生细菌与植物相结合的好处，增加修复污染物已成功地尝试从污染土壤中去除有毒金属。内生细菌存在于植物宿主内而不引起疾病症状。此外，据报道，金属抗性内生菌存在于生长在重金属污染土壤上的各种超富集植物中，并且在植物的成功存活和生长中起重要作用。此外，据报道，抗金属内生菌通过多种机制促进植物生长，例如固氮、溶解矿物质、产生植物激素、铁载体、利用1-氨基环丙烷-1-羧酸作为唯一N源以及转化营养元素。本文综述了植物内生抗重金属细菌的多样性和促生特性，并讨论了其在植物提取重金属污染土壤中的应用潜力。
Pollution of soils with heavy metals is becoming one of the most severe environmental and human health hazards. Due to its widespread contamination finding innovative ways to clean metal pollutant has become a priority in the remediation field. Phytoremediation, the use of plants for the restoration of environments contaminated with pollutants is a relatively new technology that is more benign than current engineering solutions to treat contaminated sites. Recently, the benefits of combining endophytic bacteria with plants for increased remediation of pollutants have been successfully tried for toxic metal removal from contaminated soils. Endophytic bacteria reside within plant hosts without causing disease symptoms. Further, the metal resistant endophytes are reported to be present in various hyperaccumulator plants growing on heavy metal contaminated soils and play an important role in successful survival and growth of plants. Moreover, the metal resistant endophytes are reported to promote plant growth by various mechanisms such as nitrogen fixation, solubilization of minerals, production of phytohormones, siderophores, utilization of 1-aminocyclopropane-1-carboxylic acid as a sole N source and transformation of nutrient elements. In this review we highlight the diversity and plant growth promoting features of metal resistant endophytic bacteria and discuss their potential in phytoextraction of heavy metals from contaminated soils.