Geogenic arsenic (As) contamination in Bengal Delta Plain is a growing environmental and research concern. Cultivation of staple crops like paddy on these contaminated fields is one of the major routes for human dietary exposure. The present study investigates changes of arsenic concentrations in paddy plant parts, root soil and surface soil throughout the various phases of pre-monsoon (boro) cultivation. Arsenic uptake property of paddy plants collected from 10 fields was found to be dependent on the variety of paddy plant (like Minikit, Jaya) rather than arsenic levels in groundwater (0.074-0.301 mg/l) or soil (25.3-60 mg/kg). Arsenic is translocated from root to aerial parts in descending order. Leaf, stem, root, root soil and surface soil showed a similar trend in their change of arsenic concentration throughout the cultivation period. Arsenic concentration was highest in vegetative phase; sharply declined in reproductive phase; followed by moderate increase in ripening phase. The young root tissues in vegetative (primary) phase could uptake arsenic at a much faster rate than the older tissues in later phases. With the growth of the plant, higher concentrations of iron in root soil in the reproductive phase confirmed the formation of iron plaques on the surface of the root, which sequester arsenic and prevented its uptake by plants. Finally, co-precipitation of arsenic with iron released from crystallized iron plaques results in loosening of the iron plaques from root surface. Thus, soil arsenic concentration increases in the final phase of cultivation which in turn contributes to increased concentration in plant parts.
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http://dx.doi.org/10.1016/j.chemosphere.2018.07.041 | DOI Listing |
Front Public Health
January 2025
Department of Otorhinolaryngology, Air Force Hospital Medical Service Department in Western Theatre, Chengdu, China.
Background: Hearing loss (HL) is a common sensory disorder in humans. Studies on the relationship between arsenic, which is a highly toxic and widely distributed heavy metal with a health risk to humans, and hearing status in humans are contradictory and mostly focused on people living in arsenic-contaminated areas. This study investigated the association between urinary arsenic levels and hearing threshold shifts in the general population in the United States.
View Article and Find Full Text PDFMicrob Pathog
December 2024
Department of Biology, Faculty of Science, Arak University, Arak, 38156-8-8349, Iran.
Ecotoxicol Environ Saf
December 2024
Chinese Academy of Geological Sciences, China Geology Survey, Ministry of Natural Resources, Beijing 100037, China.
This study investigates the pollution characteristics, spatial patterns, causes, and ecological risks of heavy metals in the soils of the southeastern Hubei polymetallic mining areas, specifically the Jilongshan (JLS) and Tonglushan (TLS) regions, located in the middle and lower reaches of the Yangtze River. The main findings are as follows: (1) Among the heavy metals present in the soil, copper (Cu) has the highest average concentration at 278.54 mg/kg, followed by zinc (Zn) at 161.
View Article and Find Full Text PDFChemosphere
December 2024
Systems Toxicology Group, Food, Drug & Chemical, Environment and Systems Toxicology Division, CSIR-Indian Institute of Toxicology Research (CSIR-IITR), Vishvigyan Bhawan, 31, Mahatma Gandhi Marg, Lucknow-226001, Uttar Pradesh, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India. Electronic address:
The review aims to examine the neurotoxic effects of arsenic, particularly exploring the roles of glial cells-astrocytes, microglia, and oligodendrocytes, amid its widespread environmental contamination and impact on cognitive impairments. It highlights the role of altered neurotrophin and growth factor signaling in disrupting neuronal health and cognitive performance. It elucidates the intricate interactions between oxidative stress, DNA damage, neurotransmitter disruption, and cellular signaling alterations, underscoring the vital importance of the glial cells.
View Article and Find Full Text PDFEnviron Sci Technol
December 2024
Institute of Biology, University of Neuchatel, 2000 Neuchatel,Switzerland.
The use of nanoparticles is a promising ecofriendly strategy for mitigating both abiotic and biotic stresses. However, the physiological and defense response mechanisms of plants exposed to multiple stresses remain largely unexplored. Herein, we examined how foliar application of biogenic nanosilica (BNS) impacts rice plant growth, molecular defenses, and metabolic responses when subjected to arsenic (As) toxicity and infested by the insect .
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