根际促生菌影响植物吸收和转运重金属的研究进展

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国家科技期刊平台
NETL
NSTL
万方数据
维普

中文摘要：土壤重金属污染对生态环境和人类健康造成严重危害，使得土壤重金属污染修复成为全球关注的研究热点之一。根际土壤中存在着数量和种类丰富的微生物种群，是根际环境中最重要的生物因素。重金属污染土壤中根际微生物与植物根系以及土壤形成特殊根际微环境，影响植物重金吸收、转运过程。根际促生菌通过产生植物生长激素类物质促进植物生长，改变根际微环境中重金属元素生物有效性，增加修复植物重金属吸收量，强化重金属污染土壤植物修复效率。近年来，根际促生菌强化重金属污染土壤植物修复效率相关研究文献数量迅速增加，最新研究成果表明：根际促生菌通过菌体表面活性基团吸附，诱导植物系统抗性（ISR），激活植物抗氧化酶活性，分泌高亲和性铁载体（Siderophores）增加根际铁供给量，竞争性抑制重金属元素的根系吸收，改变植物重金属的吸收、转运及胞内分布过程，抑制重金属元素向植物地上部分转运，同时增加农作物产量。文章对根际促生菌影响植物重金属吸收﹑转运最新研究进展进行综述，提出根际促生菌原位定殖，重金属元素亚细胞分布和重金属吸收、转运分子调控机制等方面的深入研究，将有助于进一步阐明重金属污染土壤植物根际促生菌-植物相互作用机制。通过根际促生菌调控农作物可食部分重金属的累积量，为实现中低污染农田安全生产与修复研究提供新思路。

外文标题：Effects of Plant Growth Promoting Rhizobacteria on Plants Heavy Metal Uptake and Transport：A Review

外文摘要：Given that soil pollution heavy metals is a major threat to ecological environment and human well-being. The remediation of heavy metals polluted soils is a hot topic of global concern being vigorously studied these days. This paper presents a review of the current research of the plant growth promoting rhizobacteria (PGPR), which are known to play a particular vital role in rhizosphere heavy metals uptake and translocation of plants. The rhizosphere soil harbored a wide variety of microorganisms that are key factors dominating the rhizosphere environment. As known, the rhizosphere provides a complex and dynamic microenvironment where microorganism in metal contaminated soils, in association with the surroundings of plant roots and rhizosphere soil.The PGPG have been shown to possess several characteristics that can alter heavy metal bioavailability, through releasing of plant growth hormones, and thus accentuating heavy metals uptake in plants, eventually resulting in the improvement of phytoremediation efficiency for heavy metal contaminated soil. To date, there has been a boom in numbers of studies that focus on the reinforcement of phytoremediation efficiency involved in the heavy metals tolerant PGPR. Latest studies show that the PGPG could enhance agricultural yields with preventing the upward transport of metal ions to the above ground parts of plants or crops via several mechanism such as, accelerating the metal absorption onto cell rhizobacteria cell wall active and functional groups, inducing plant systemic resistance (ISR), triggering the antioxidant enzymes activity, secreting high affinity iron carrier termed Siderophores into rhizosphere, competitively inhibiting the heavy metal uptake by roots, and modifying the processes of absorption, transportation and intracellular distribution of metal ions. This review provides new progresses about the mechanisms possessed by PGPR that ameliorate heavy metal stress of plants and how the Cd accumulation reduced by the inoculants. Furthermore, the studies of PGPR highlight suit colonization, subcellular distribution and the molecular mechanism of heavy metal uptake and transportation will help to clarify the PGPR-plant interaction mechanism. The conclusion of this review highlight a new insight into the exploration of PGPR on heavy metal contaminated soil crops safety production and remediation.

外文关键词：

plant growth promoting rhizobacteria (PGPR)heavy metaluptaketransportationsoil contamination remediation

作者：

郭军康、董明芳、丁永祯、冯人伟、王瑞刚、徐应明

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作者单位：

农业部环境保护科研监测所，中国农业科学院农田重金属污染修复创新团队，天津 300191

广西大学农学院，广西南宁 530003

农业部环境保护科研监测所，天津 300191

关键词：

植物根际促生菌重金属吸收转运污染土壤修复

基金：

中央级公益性科研院所基本科研业务费专项资金（农业部环境保护科研监测所）国家自然科学基金国家自然科学基金天津市自然科学基金

项目编号：

410011914147311512JCYBJC14900

出版年：

2015

DOI：

10.16258/j.cnki.1674-5906.2015.07.023

生态环境学报

广东省生态环境与土壤研究所广东省土壤学会

生态环境学报

CSTPCDCSCD北大核心

影响因子：1.608

ISSN：1674-5906

年,卷(期)：2015.(7)

被引量46
参考文献量13