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Zhi Ran, Cheng Chen, Fabo Chen, Ming'an Liao, Lijin Lin, Xiulan Lv, Qunxian Deng, Xun Wang, Jin Wang, Yi Tang, Huaxiong Li
Plant hormones can improve the phytoremediation capabilities of heavy metal hyperaccumulator plants. In this study, different doses of indole-3-butytric acid (IBA) were sprayed on the leaves of the lead (Pb) and zinc (Zn) accumulator plant Pseudostellaria maximowicziana, which was planted in Pb-Zn contaminated soil, and the effects of IBA on Pb and Zn accumulation levels in P. maximowicziana were studied. Spraying 25- and 50-mg/L IBA doses increased the stem, leaf and shoot biomasses of P. maximowicziana compared with the control, while 75- and 100-mg/L IBA doses decreased them...
March 13, 2018: Environmental Monitoring and Assessment
Ralph J M Temmink, Sarah F Harpenslager, Alfons J P Smolders, Gijs van Dijk, Roy C J H Peters, Leon P M Lamers, Monique M L van Kempen
Azolla spp., a water fern often used for phytoremediation, is a strong phosphorus (P) accumulator due to its high growth rate and N2 fixing symbionts (diazotrophs). It is known that plant growth is stimulated by P, but the nature of the interactive response of both symbionts along a P gradient, and related changes in growth-limiting factors, are unclear. We determined growth, and N and P sequestration rates of Azolla filiculoides in N-free water at different P concentrations. The growth response appeared to be biphasic and highest at levels ≥10 P µmol l-1 ...
March 13, 2018: Scientific Reports
Paola Mattei, Alessandro Gnesini, Cristina Gonnelli, Chiara Marraccini, Grazia Masciandaro, Cristina Macci, Serena Doni, Renato Iannelli, Stefano Lucchetti, Francesco P Nicese, Giancarlo Renella
Sediments dredged by an industrial port, slightly contaminated by heavy metals and petroleoum hydrocarbons, were phytoremediated and used as peat-free growing media for the red robin photinia (Photinia x fraseri L.). Plants were grown on sediment only (S), sediment mixed with composted pruning residues (S + PR), sediment fertilized with controlled release fertilizers (S + F) and peat-based growing media as control (C). Plant elongation and dry weight, leaf contents of chlorophyll, malondialdehyde (MDA), macronutrients and heavy metals were determined at the end of one growing season...
February 27, 2018: Chemosphere
Nongnuch Wiangkham, Benjaphorn Prapagdee
This work mainly aims to explore the potential of synergistic use of cadmium-resistant bacteria and Napier grass to promote cadmium phytoremediation and the possibility of using the harvested Napier grass for biomass fuel. A pot experiment was carried out by transplanting Napier grass with and without bacterial inoculation in cadmium contaminated soil for 6 months. The results found that Micrococcus sp. significantly promoted the shoot biomass of Napier grass but not the root biomass. Micrococcus sp. and Arthrobacter sp...
March 6, 2018: Chemosphere
Vineet Singh, Bhawna Pandey, Surindra Suthar
The increasing availability of antibiotics in wastewater has created a serious threat to non-target organisms in the environment. The aim of this study was to evaluate the potential toxicity of amoxicillin on duckweed Spirodela polyrhiza during a short-term exposure (7 d). The duckweed was exposed to a range of environmentally relevant (0.0001-0.01 mg L-1 ) and high (0.1 and 1 mg L-1 ) concentrations of amoxicillin. Subsequently, biomarkers of toxicity such as growth, pigments (Chl a, Chl b and carotenoids), antioxidative enzyme activity (catalase, CAT; superoxide dismutase, SOD; and ascorbate peroxidases, APX), and biochemical content (protein, lipid and starch) were analysed in their fronds...
March 5, 2018: Chemosphere
Hong Sun, Yixiao Xie, Yulong Zheng, Yanli Lin, Fuyu Yang
A greenhouse experiment was carried out to investigate the effects of arbuscular mycorrhizal fungi (AMF) on the growth, P and Cd concentrations and bioenergy quality-related factors of five cultivars of switchgrass, including three lowland cultivars (Alamo (Ala), Kanlow (Kan), Performer (Per)) and two highland cultivars (Blackwell (Bw), Summer (Sum)), with 0, 1 and 10 mg/kg Cd addition levels. The results showed that AMF inoculation notably increased the biomass and P concentrations of all the cultivars. The Cd concentrations in the roots were higher than those in the shoots of all cultivars irrespective of inoculation, but the AMF had different effects on Cd accumulation in highland and lowland cultivars...
2018: PeerJ
Maria Isidoria Silva Gonzaga, Cheryl Mackowiak, André Quintão de Almeida, Alberto Wisniewski, Danyelle Figueiredo de Souza, Idamar da Silva Lima, Amanda Nascimento de Jesus
Copper contamination and toxicity in soils is a worldwide problem, especially in areas where copper-based fungicides are applied. Indian mustard (Brassica juncea L.) plants are used in phytoremediation and are also edible crops commonly cultivated in organic agricultural areas. Application of biochar to Cu contaminated soils may reduce Cu availability and uptake, thereby allowing for greater Indian mustard production. A (3 × 2) + 1) experiment in a randomized complete block design was used to evaluate the effect of three different biochars (coconut shell, orange bagasse and sewage sludge) and two application rates (30 and 60 t ha-1 ) on Cu uptake by Indian mustard during three successive growth cycles and Cu immobilization in soil, under greenhouse conditions...
March 5, 2018: Chemosphere
Jie Luo, Jian Wu, Siyuan Huo, Shihua Qi, Xiaowen Sophie Gu
The combined utilization of direct or alternating electric fields and phytoremediation was designed to decontaminate multi-metal polluted soil at a field scale e-waste recycling impacted site. Eucalyptus globulus was chosen for metal purification for its resilient and unpalatable nature. Biomass production, metal concentration and water use efficiency of the species under direct current (DC) and alternating current (AC) fields with various voltages were investigated. DC and AC fields stimulated the growth of the plant, except for DC field with high voltage (10 V)...
March 5, 2018: Chemosphere
S Mykolenko, V Liedienov, M Kharytonov, N Makieieva, T Kuliush, I Queralt, E Marguí, M Hidalgo, G Pardini, M Gispert
The work was conducted to establish contamination from improper disposal of hazardous wastes containing lead (Pb) and antimony (Sb) into nearby soils. Besides other elements in the affected area, the biological role of Sb, its behaviour in the pedosphere and uptake by plants and the food chain was considered. Wastes contained 139532 ± 9601 mg kg-1 (≈14%) Pb and 3645 ± 194 mg kg-1 (≈0.4%) Sb respectively and variability was extremely high at a decimetre scale. Dramatically high concentrations were also found for As, Cd, Cu, Mn, Ni, Sn and Zn...
March 7, 2018: Environmental Pollution
Shunhui Yu, Li Sheng, Chunyan Zhang, Hongping Deng
The present paper deals with the physiological response of the changes in chemical contents of the root, stem and leaf of Arundo donax seedlings stressed by excess cadmium using Fourier transform infrared spectroscopy technique, cadmium accumulation in plant by atomic absorption spectroscopy were tested after different concentrations cadmium stress. The results showed that low cadmium concentrations (<1.0mg/L) the root tissue of Arundo donax uses osmosis of organic substances (e.g. carbohydrates and amino acids) to improve cadmium tolerance...
February 13, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Pankajkumar R Waghmare, Anuprita D Watharkar, Byong-Hun Jeon, Sanjay P Govindwar
In this study, we have described three steps to produce ethanol from Pogonatherum crinitum , which was derived after the treatment of textile wastewater. (a) Production of biomass: biomass samples collected from a hydroponic P. crinitum phytoreactor treating dye textile effluents and augmented with Ca-alginate immobilized growth-promoting bacterium, Bacillus pumilus strain PgJ (consortium phytoreactor), and waste sorghum husks were collected and dried. Compositional analysis of biomass (consortium phytoreactor) showed that the concentration of cellulose, hemicelluloses and lignin was 42, 30 and 17%, respectively, whereas the biomass samples without the growth-promoting bacterium (normal phytoreactor) was slightly lower, 40, 29 and 16%, respectively...
March 2018: 3 Biotech
Wen Zheng, Zheng-Yan Zhong, Hong-Bin Wang, Hai-Juan Wang, Dong-Mo Wu
A hydroponic experiment was conducted to investigate the effects of oxalic acid (OA) on arsenic (As) uptake and the physiological responses of Hydrilla verticillata exposed to 3 mg L-1 of As in different forms. Plant As(III) uptake was significantly increased by 200-2000 µg L-1 OA. However, an increase of As(V) uptake was only shown with 1000 µg L-1 OA, and no significant difference was observed with dimethylarsinate treatment. Peroxidase and catalase activities, and the contents of photosynthetic pigments, soluble sugar and proline, were significantly increased by 1000 µg L-1 OA during As(III) treatment...
March 6, 2018: Bulletin of Environmental Contamination and Toxicology
Marcela Brandão Costa, Francesca Valêncio Tavares, Claudia Bueno Martinez, Ioni Gonçalves Colares, Camila de Martinez Gaspar Martins
This study investigated the ability of Potamogeton pectinatus L. to accumulate copper and its effects on plants. In accumulation tests, macrophytes were exposed (96 h) to different copper concentrations (0-1000 µM) and the metal was measured in media and plant tissues (roots, stems and leaves) to determine the bioconcentration factor (BCF). Plants accumulated high concentrations of copper in a dose-dependent manner and roots was the main organ for copper accumulation. However, the more copper increased in water, the more BCF values decreased...
March 3, 2018: Ecotoxicology and Environmental Safety
Matsodoum Nguemte Pulchérie, Suzanne Ii Nina Gregoire Ndemba Etim, Guy Valerie Djumyom Wafo, Pierre François Djocgoue, Ives Magloire Kengne Noumsi, Adrien Wanko Ngnien
Soils pollution with hydrocarbons is on the increase, especially in developing countries like Cameroon. Identifying plant species capable of growing on hydrocarbon-polluted soils remains an essential step in phytoremediation, a low cost, solar energy driven clean up technique in which living green plants are used. Here, we report floristic surveys conducted in 4 cities of Cameroon to identify plants with phytoremediation capacities. A total of 13 hydrocarbon-polluted sites were surveyed in each city using the quadrat method...
February 23, 2018: International Journal of Phytoremediation
Aleksandra Koźmińska, Alina Wiszniewska, Ewa Hanus-Fajerska, Ewa Muszyńska
Avoidance and reduction of soil contamination with heavy metals is one of the most serious global challenges. Nowadays, science offers us new opportunities of utilizing plants to extract toxic elements from the soil by means of phytoremediation. Plant abilities to uptake, translocate, and transform heavy metals, as well as to limit their toxicity, may be significantly enhanced via genetic engineering. This paper provides a comprehensive review of recent strategies aimed at the improvement of plant phytoremediation potential using plant transformation and employing current achievements in nuclear and cytoplasmic genome transformation...
2018: Plant Biotechnology Reports
Anna Papierniak, Katarzyna Kozak, Maria Kendziorek, Anna Barabasz, Małgorzata Palusińska, Jerzy Tiuryn, Bohdan Paterczyk, Lorraine E Williams, Danuta M Antosiewicz
Tobacco has frequently been suggested as a candidate plant species for use in phytoremediation of metal contaminated soil but knowledge on the regulation of its metal-homeostasis is still in the infancy. To identify new tobacco metal transport genes that are involved in Zn homeostasis a bioinformatics study using the tobacco genome information together with expression analysis was performed. Ten new tobacco metal transport genes from the ZIP, NRAMP, MTP, and MRP/ABCC families were identified with expression levels in leaves that were modified by exposure to Zn excess...
2018: Frontiers in Plant Science
Zhihao Wu, Shengrui Wang, Jun Luo
DGT (diffusive gradients in thin films) technique and DIFS (DGT induced fluxes in sediment) model are firstly designed for macrophyte-rhizobox system and in-situ macrophytes in Lake Erhai. Dynamics of phosphorus (P) transfer in Zizania latifolia (ZL) and Myriophyllum verticiilatur (MV) rhizosphere is revealed and phytoremediation performance for P in sediment is evaluated. Dynamic transfer process of P at DGT/sediment interface includes (i) diffusion flux and concentration gradients at DGT(root)/porewater interface leading to porewater concentration (C0 ) depletion and (ii) P desorption from labile P pool in sediment solid to resupply C0 depletion...
February 7, 2018: Journal of Hazardous Materials
Xiaotong Wang, Junkai Zhi, Xinru Liu, Hao Zhang, Huabo Liu, Jichen Xu
Heavy metal ATPase (HMA) plays an important role in phytoremediation via long-distance transportation from root to shoot. In this report, we identified a heavy metal ATPase gene, PtoHMA5, from Populus tomentosa Carr. Its encoded peptide consists of 967 amino acids and has eight trans-membrane motifs inside. Tobacco plants were transformed with this gene via Agrobacterium tumefaciens-mediated method. After exposure to 50 mg/LCdCl2 for 10 d, the transgenic lines displayed higher cadmium accumulation in leaves than did the wild-type plants with an absolute increase of 25...
February 28, 2018: International Journal of Biological Macromolecules
Muhammad Moman Khan, Ejazul Islam, Samra Irem, Kalsoom Akhtar, Muhammad Yasin Ashraf, Javed Iqbal, Dan Liu
Hydroponics experiment was conducted to investigate the effects of different levels of Pb on Para Grass (Brachiaria mutica) and Castorbean (Ricinus communis L). Generally, Para Grass exhibited higher tolerance to excessive concentrations of Pb in nutrient solution, whereas a consistent decline was observed in growth of Castorbean plants exposed to similar Pb levels. Malondialdehyde (MDA) and H2 O2 contents exhibited contrasting results with a general decrease in Para Grass and a linear increase in case of Castorbean...
February 20, 2018: Chemosphere
Rasika M Potdukhe, Priyanka Bedi, Bijaya K Sarangi, Ram A Pandey, Sanjog T Thul
Hyperaccumulation of arsenic (As) by brake fern Pteris vittata has been described as an important genetic trait that provides an option for development of a sustainable phytoremediation process for As mitigation. Accumulation of very high concentration of arsenic in above-ground tissues may be the result of arsenic vacuole compartmentalization, but the mechanism(s) of arsenic uptake and transport by underground tissues are largely unknown. In this study, we made an attempt towards understanding the molecular mechanism of As hyperaccumulation in this plant...
March 2018: Journal of Biosciences
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