{"title":"Phytoremediation of Chromium (VI)-Contaminated Soil by Euphorbia tithymaloides L. and Metagenomic Analysis of Rhizospheric Bacterial Community","authors":"Deepika, Anil Kumar Haritash","doi":"10.1007/s11270-024-07305-z","DOIUrl":null,"url":null,"abstract":"<p>This study investigated the growth of <i>Euphorbia tithymaloides</i> L. in soil contaminated with Cr (VI), focusing on plant development, Cr (VI) accumulation in the plant, and associated rhizosphere bacterial communities. Plants were cultivated in pots for a period of 123 days with varying Cr (VI) levels (0, 10, 20, 30, and 40 mg-kg<sup>−1</sup>) in the soil. As Cr (VI) concentration increased, plant growth indicators such as fresh weight, dry weight, root length, and shoot length were observed to be decreasing. The Cr (VI) concentration peaked in plant tissues under the 40 mg-kg<sup>−1</sup> treatment, with concentrations of 397.5 mg-kg<sup>−1</sup>, 98.12 mg-kg<sup>−1</sup>, and 62.32 mg-kg<sup>−1</sup> in roots, stems, and leaves respectively. Whereas, the total Cr (VI) accumulation was maximum in the 30 mg-kg<sup>−1</sup> treatment due to higher plant biomass. Further, the phytoremediation efficiency of the plant was evaluated through the bio-concentration factor (BCF) and translocation factor (TF). The BCF indicated soil-to-plant heavy metal uptake capacity exceeding 1, while the TF showed root-to-shoot translocation below 1 for all treatments, implying effective phytostabilisation potential. Metagenomic analysis of rhizospheric soil highlighted dominant bacterial phyla of Firmicutes, Proteobacteria, Bacteroidetes, Actinobacteria, and Acidobacteria. Many observed bacterial taxa are metal-tolerant and commonly found in heavy metal-contaminated soil, suggesting a potential contribution to mitigating metal toxicity and enhancing plant growth. However, a comprehensive investigation into microbial communities' roles during phytoremediation requires further in-depth research.</p><h3 data-test=\"abstract-sub-heading\">Graphical Abstract</h3>\n","PeriodicalId":808,"journal":{"name":"Water, Air, & Soil Pollution","volume":null,"pages":null},"PeriodicalIF":3.8000,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Water, Air, & Soil Pollution","FirstCategoryId":"6","ListUrlMain":"https://doi.org/10.1007/s11270-024-07305-z","RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}
引用次数: 0
Abstract
This study investigated the growth of Euphorbia tithymaloides L. in soil contaminated with Cr (VI), focusing on plant development, Cr (VI) accumulation in the plant, and associated rhizosphere bacterial communities. Plants were cultivated in pots for a period of 123 days with varying Cr (VI) levels (0, 10, 20, 30, and 40 mg-kg−1) in the soil. As Cr (VI) concentration increased, plant growth indicators such as fresh weight, dry weight, root length, and shoot length were observed to be decreasing. The Cr (VI) concentration peaked in plant tissues under the 40 mg-kg−1 treatment, with concentrations of 397.5 mg-kg−1, 98.12 mg-kg−1, and 62.32 mg-kg−1 in roots, stems, and leaves respectively. Whereas, the total Cr (VI) accumulation was maximum in the 30 mg-kg−1 treatment due to higher plant biomass. Further, the phytoremediation efficiency of the plant was evaluated through the bio-concentration factor (BCF) and translocation factor (TF). The BCF indicated soil-to-plant heavy metal uptake capacity exceeding 1, while the TF showed root-to-shoot translocation below 1 for all treatments, implying effective phytostabilisation potential. Metagenomic analysis of rhizospheric soil highlighted dominant bacterial phyla of Firmicutes, Proteobacteria, Bacteroidetes, Actinobacteria, and Acidobacteria. Many observed bacterial taxa are metal-tolerant and commonly found in heavy metal-contaminated soil, suggesting a potential contribution to mitigating metal toxicity and enhancing plant growth. However, a comprehensive investigation into microbial communities' roles during phytoremediation requires further in-depth research.
期刊介绍:
Water, Air, & Soil Pollution is an international, interdisciplinary journal on all aspects of pollution and solutions to pollution in the biosphere. This includes chemical, physical and biological processes affecting flora, fauna, water, air and soil in relation to environmental pollution. Because of its scope, the subject areas are diverse and include all aspects of pollution sources, transport, deposition, accumulation, acid precipitation, atmospheric pollution, metals, aquatic pollution including marine pollution and ground water, waste water, pesticides, soil pollution, sewage, sediment pollution, forestry pollution, effects of pollutants on humans, vegetation, fish, aquatic species, micro-organisms, and animals, environmental and molecular toxicology applied to pollution research, biosensors, global and climate change, ecological implications of pollution and pollution models. Water, Air, & Soil Pollution also publishes manuscripts on novel methods used in the study of environmental pollutants, environmental toxicology, environmental biology, novel environmental engineering related to pollution, biodiversity as influenced by pollution, novel environmental biotechnology as applied to pollution (e.g. bioremediation), environmental modelling and biorestoration of polluted environments.
Articles should not be submitted that are of local interest only and do not advance international knowledge in environmental pollution and solutions to pollution. Articles that simply replicate known knowledge or techniques while researching a local pollution problem will normally be rejected without review. Submitted articles must have up-to-date references, employ the correct experimental replication and statistical analysis, where needed and contain a significant contribution to new knowledge. The publishing and editorial team sincerely appreciate your cooperation.
Water, Air, & Soil Pollution publishes research papers; review articles; mini-reviews; and book reviews.