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cadmium tolerance

Karin Kollárová, Zuzana Kusá, Zuzana Vatehová-Vivodová, Desana Lišková
The aim of this article was to evaluate the viability of maize protoplasts, cell wall regeneration, Cd uptake by protoplasts, and the impact of silicon under cadmium cations (Cd) stress in two maize hybrids with contrasting tolerances to Cd toxicity. The differences in protoplast viability between the sensitive (Novania) and tolerant (Almansa) hybrids were noticeable even at the beginning of culture. The percentage of living protoplasts in the presence of Cd was higher in the tolerant hybrid. In both hybrids, Si supplementation significantly increased the viability of protoplasts exposed to Cd...
December 13, 2018: Ecotoxicology and Environmental Safety
Yu Cao, Hui Liu, Junyao Sun, Yang Liu, Hong Sheng Jiang, Wei Wang, Wei Li
Submerged macrophytes are considered the main primary producers in shallow lakes. Recently, they have experienced a decline due to increasing environmental impacts, e.g., excessive heavy metal loads. Compared to extensive studies on vegetative growth, reports on effects of heavy metals on propagule germination and reproduction remain scarce. In this study, three experiments were conducted to investigate the effects of cadmium (Cd) on the propagule germination and sexual reproduction of submerged macrophytes...
December 8, 2018: Chemosphere
Adeline Jacquet, Damien Barbeau, Josiane Arnaud, Samer Hijazi, Florence Hazane-Puch, Frédéric Lamarche, Charline Quiclet, Karine Couturier, Eric Fontaine, Jean-Marc Moulis, Christine Demeilliers
Cadmium (Cd) is a metal which may participate in the development of type II diabetes even if Cd exposure levels are mild. However, experimental studies focusing on daily environmentally relevant doses are scarce, particularly for glucose metabolism of the offspring of chronically exposed mothers. The aim is to measure the impact of maternal low level Cd exposure on glucose and lipid metabolism of offspring. Female rats were exposed to 0, 50 or 500 μ .d-1 of CdCl2 , 21 days before mating and during 21 days of gestation and 21 days of lactation...
November 26, 2018: Chemosphere
Zhengfei Wang, Dan Tang, Linxia Sun, Xueling Shi, Ruobing Liu, Huayun Guo, Boping Tang
BACKGROUND: The mudflat crab Helice tientsinensis is one of the most commercially valuable species for crabmeat production due to its delicious taste. These crabs are mainly found in coastal wetland where they are seriously threatened by toxic heavy metal pollution. In crustaceans, the hepatopancreas is an important organ for detoxification, and metal toxic substances can be converted to non-toxic or less toxic compounds in this organ. OBJECTIVE: To develop a better understanding of the molecular response of H...
December 7, 2018: Genes & Genomics
Kun Qiao, Yanbao Tian, Zhangli Hu, Tuanyao Chai
Heavy metal contamination affects crop growth and development, and can indirectly threaten human health. Therefore, improving the content of microelements and reducing the accumulation of toxic metals by genetic breeding in crops is an effective strategy to solve this environmental problem. Previous reports show plant cadmium resistance (PCR) protein can transport zinc (Zn) and cadmium (Cd). The cell number regulator (CNR) protein, which functions to regulate organ size, has high similarity to, and shares conserved motifs with, PCR...
December 11, 2018: Environmental Science & Technology
Meng Wang, Shuhui Duan, Zhicheng Zhou, Shibao Chen, Duo Wang
Melatonin is a multifunctional signaling molecule that regulates broad aspects of responses to environmental stresses in plants. Cadmium (Cd) is a persistent soil contaminant that is toxic to all living organisms. Recent reports have uncovered the protective role of melatonin in alleviating Cd phytotoxicity, but little is known about its regulatory mechanisms in plants. In this study, we found that foliar application of melatonin (in particular 100 μmol L-1 ) remarkably enhanced Cd tolerance of tobacco (Nicotiana tabacum L...
December 4, 2018: Ecotoxicology and Environmental Safety
Chunsheng Li, Ying Xu, Laihao Li, Xianqing Yang, Yueqi Wang
The toxicity of cadmium (Cd) is the major limitation to its removal using microorganisms. The Cd tolerance of Pichia kudriavzevii was obviously enhanced by acid stress based on multi-stress cross-protection. RNA-Seq showed that most differentially expressed genes (DEGs) in the Pentose phosphate pathway, Citrate cycle (TCA cycle), Glycolysis/Gluconeogenesis, Peroxisome and Glutathione metabolism were up-regulated by acid stress. The up-regulated expression of genes related to ATP synthesis (GOR1, ALD5, ADH4, ADH6, MDH2, IDH1, IDH2, and ATP19) and Cd transport (GSTY2, GTO2, GLO2, and YOR1), and the improvement of intracellular GSH level and GST activity, reduced the Cd toxicity towards P...
November 27, 2018: Journal of Hazardous Materials
Hye-Min Kang, Jin-Sol Lee, Young Hwan Lee, Min-Sub Kim, Heum Gi Park, Chang-Bum Jeong, Jae-Seong Lee
Although several studies have reported on different interspecific sensitivities in response to various toxicants, the response mechanisms are still poorly understood. Here, we investigate the interspecific toxicity of cadmium (Cd) and its mechanism using three marine rotifer Brachionus spp. that are distinguishable by body size, which is considered the most significant indicator of phenotypic difference. The body sizes of B. plicatilis, B. koreanus, and B. rotundiformis are significantly different throughout their life cycles (egg, neonate, and adult), with the smaller rotifer exhibiting higher sensitivity to Cd...
October 29, 2018: Aquatic Toxicology
Yuan-Yuan Wang, Yu Wang, Guang-Zhe Li, Lin Hao
Previous studies have demonstrated that the genetic modification of basal salicylic acid (SA) level changed Arabidopsis plant response to cadmium (Cd) stress, but the mechanisms remain evaluated. In this study, Arabidopsis wild type (WT) and its SA-reducing transgenic line nahG (naphthalene hydroxylase G), SA-accumulating mutant snc1 (suppressor of nonexpressor of PR gene, constitutive 1) were exposed to 50 μM Cd2+ for 48 h or 7 d (just for assessing plant growth). The Cd treatment increased the expression levels of SA biosynthesis-related genes leading to enhanced SA accumulations in plant leaves, which was further confirmed by the expression patterns of SA marker genes...
November 26, 2018: Ecotoxicology and Environmental Safety
Yanmei Li, Xiumei Yu, Yongliang Cui, Weiguo Tu, Tian Shen, Min Yan, Yumai Wei, Xianggui Chen, Qiongyao Wang, Qiang Chen, Yunfu Gu, Ke Zhao, Quanju Xiang, Likou Zou, Menggen Ma
AIMS: Because the effect of Cd2+ - immobilized microbe on Cd uptake of plants in Cd contaminated soil remains underexplored, this study focuses on the effect of Cd2+ - immobilized rhizobia on Cd uptake of soybean. METHODS AND RESULTS: Strain KG2 from soybean nodule was identified as Rhizobium pusense KG2 by phylogenetic analysis. Rhizobium pusense KG2 showed the 120 mg L-1 of minimal lethal concentration for Cd2+ . In 50 and 100 mg L-1 of Cd2+ liquid, approximately 2×1010 cells removed 56...
November 29, 2018: Journal of Applied Microbiology
B K K K Jinadasa, G S Chathurika, C D Jayaweera, G D T M Jayasinghe
Commercially important marine fish, yellowfin tuna (YFT), and swordfish (SF), collected from the Indian Ocean around Sri Lanka were analysed for mercury (Hg) and cadmium (Cd) content. The ranges for Hg were < 0.07-1.60 and < 0.07-4.30 mg/kg, while for Cd < 0.006-0.134 and 0.006-0.180 mg/kg in YFT and SF, respectively. In SF 13.3% and in YFT 9.2% exceeded the 1 mg/kg limit for Hg, while 3.1% of YFT exceeded the 0.1 mg/kg limit for Cd. All other samples were well below the maximum limits. Human health risk assessment was investigated using Estimated Daily Intake, Total Hazard Quotient, Hazard Index, and Provisional Tolerable Weekly Intake values for Hg and Cd...
November 29, 2018: Food Additives & Contaminants. Part B, Surveillance
S A Ayesa, K S Chukwuka, O O Odeyemi
Soil heavy metals pollution is of global concern in view of their flow through the food chain. The convectional, physical, and chemical approaches to remediate polluted soils are usually expensive and not eco-friendly. Phytoextraction is a promising alternative because of the cost effectiveness and eco-friendliness. Therefore, this study was designed to determine the abilities of Chromolaena odorata (Co) and Tithonia diversifolia (Td) to extract heavy metals from polluted soil. Soil analysis was done in part per million (ppm) before Td and Co were grown separately on sixty soil samples of 6...
2018: Toxicology Reports
Maryam Nourimand, Christopher D Todd
Allantoin, an important intermediate of ureide metabolism, has been the subject of investigation recently due to its dual function in nitrogen recycling and abiotic stress response in plants. Allantoin appears to be the dominant ureide accumulating in response to different abiotic stresses, and mutants containing elevated allantoin concentrations exhibit a stress-tolerant phenotype due to limited reactive oxygen species (ROS) generation. Here we describe the involvement of allantoin in stress response and attempt to explain the regulatory mechanism(s) underlying allantoin function in plants...
November 15, 2018: Plant Physiology and Biochemistry: PPB
Kamil Jurowski, Mirosław Krośniak, Maria Fołta, Michael Cole, Wojciech Piekoszewski
There is currently a lack of risk assessments around Pb and Cd in prescription food for special medical purposes (FSMPs) and modified milk products available in from pharmacies in Poland. This article describes and evaluates a toxicological analysis of lead and cadmium in prescription FSMPs (n = 6) and modified milk products (n = 6) available in Polish pharmacies. The metals were determined using electrothermal atomisation atomic absorption spectrometry. To make the appropriate risk assessment, we considered (1) the levels of lead and cadmium in a powdered product, (2) the amount of the metals consumed in one portion (single exposure), (3) the daily dose depending on age (months) and body weight and (4) the weekly intake of Pb and Cd in samples in comparison to provisional tolerable weekly intake (PTWI)...
January 2019: Journal of Trace Elements in Medicine and Biology
Orish Ebere Orisakwe, Zelinjo Nkeiruka Igweze, Nnaemeka Arinze Udowelle
The affordability of candies and chocolates makes their consumption common especially in children. Heavy metal contamination of these candies is well known. This study has estimated health risks associated with heavy metals (HM; Pb, Cd, Cr, Ni, and Zn) in commonly consumed candies in Nigeria. Fifty candies/sweets and chocolates/chewing gums bought from different stores in Port Harcourt and Uyo in Niger Delta, Nigeria, were processed and digested in perchloric acid. The filtrate was analyzed for these heavy metals using atomic absorption spectroscopy (AAS)...
November 20, 2018: Environmental Science and Pollution Research International
Lin Tang, Yasir Hamid, Hanumanth Kumar Gurajala, Zhenli He, Xiaoe Yang
Plant uptake of cadmium (Cd) is affected by soil and environmental conditions. In this study, hydroponic experiments were conducted to investigate the effects of elevated CO2 coupled with inoculated endophytic bacteria M002 on morphological properties, gas exchange, photosynthetic pigments, chlorophyll fluorescence, and Cd uptake of S. alfredii. The results showed that bio-fortification processes (elevated CO2 and/or inoculated with endophytic bacteria) significantly (p < 0.05) promoted growth patterns, improved photosynthetic characteristics and increased Cd tolerance of both ecotypes of S...
November 19, 2018: Environmental Science and Pollution Research International
Thomas King, Robert Sheridan
A method was developed to determine 27 elements (aluminum, arsenic, boron, cadmium, calcium, chromium, cobalt, copper, iron, lead, magnesium, manganese, mercury, molybdenum, nickel, phosphorus, potassium, selenium, sodium, sulfur, vanadium, zinc, antimony, uranium, beryllium, thallium, and thorium) in animal feeds and pet foods using closed vessel microwave digestion and inductively coupled plasma-mass spectrometry. These elements can adversely affect animal health when amounts become excessive or deficient in food...
November 16, 2018: Journal of AOAC International
Shan Chen, Qiang Wang, Haoliang Lu, Junwei Li, Dan Yang, Jingchun Liu, Chongling Yan
In the present study, a set of pot culture experiments was conducted to reveal how the metabolism process of phenolic compounds was affected by cadmium (Cd) and zinc (Zn) and to further uncover heavy metal tolerance mechanisms in Kandelia obovata. After 60d of treatment, the biomass and chlorophyll a content in the leaves were suppressed, but total phenolic compounds in roots and leaves were improved by the increasing gradient of Cd or Zn concentrations; Total phenolic compounds significantly increased by 3...
November 13, 2018: Ecotoxicology and Environmental Safety
Lebeth C Manguilimotan, Jayzon G Bitacura
The use of microorganisms in decontaminating the environment encumbered with heavy metal pollutants through biosorption is considered as a good option for bioremediation. This study was conducted to isolate Cadmium (Cd) tolerant fungi from coastal waters and sediments, compare their biosorption capabilities, and identify the isolates with the highest Cd uptake. Water and sediment samples were collected near the effluent sites of industrial belt in Ibo, Lapu-lapu City, Cebu, Philippines. Potato dextrose agar (PDA) plates containing Cd (25, 50, 75, and 100 ppm) were used to isolate Cd tolerant fungi from the samples...
2018: Journal of Toxicology
Parzhak Zoufan, Roya Jalali, Payman Hassibi, Elham Neisi, Saadat Rastegarzadeh
In this study, the effect of cadmium (Cd) uptake and concentration on some growth and biochemical responses were investigated in Malva parviflora under Cd treatments including 0, 10, 50 and 100 µM. The shoots and roots were able to accumulate Cd. However, increased Cd dose led to a considerable Cd content in the roots. Cd stress decreased growth, increased lipid peroxidation and also enhanced proline and ascorbic acid contents in both shoots and roots. Chlorophyll and carotenoid contents decreased in the plants with the increasing Cd concentration...
November 2018: Physiology and Molecular Biology of Plants: An International Journal of Functional Plant Biology
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