Arsenic (As) is an environmental and food chain contaminant. Excessive accumulation of As, particularly inorganic arsenic (Asi), in rice (Oryza sativa) poses a potential health risk to populations with high rice consumption. Rice is efficient at As accumulation owing to flooded paddy cultivation that leads to arsenite mobilization, and the inadvertent yet efficient uptake of
2019-5-18 · Now, a team of scientists from Purdue University has finally unraveled the mystery of how the plant is able to do this by analyzing the genetic and cellular mechanisms that affect its arsenic ...
Arsenic (As) is an element that is nonessential for and toxic to plants. Arsenic contamination in the environment occurs in many regions, and, depending on environmental factors, its accumulation in food crops may pose a health risk to humans. Recent progress in understanding the mechanisms of As uptake and metabolism in plants is reviewed here.
2002-4-4 · Some plant species exhibit phenotypic variation in response to arsenic species, which helps us to understand the toxicity of arsenic and the way in which plants have evolved arsenic resistances. This knowledge, for example, could be used produce plant cultivars that are more arsenic resistant or that have reduced arsenic uptake.
Arsenic (As) is an element that is nonessential for and toxic to plants. Arsenic contamination in the environment occurs in many regions, and, depending on environmental factors, its accumulation in food crops may pose a health risk to humans.Recent progress in understanding the mechanisms of As uptake and metabolism in plants is reviewed here.
2015-8-4 · Arsenic is a naturally occurring element with a long history of toxicity. Sites of contamination are found worldwide as a result of both natural processes and anthropogenic activities. The broad scope of arsenic toxicity to humans and its unique interaction with the environment have led to extensive research into its physicochemical properties and toxic
This book contains 19 informative chapters on arsenic chemistry, plant uptake, toxicity and tolerance mechanisms, as well as approaches to mitigation. Readers will be introduced to the latest findings on plant responses to arsenic toxicity, various tolerance mechanisms, and remediation techniques.
2015-8-4 · Arsenic is a naturally occurring element with a long history of toxicity. Sites of contamination are found worldwide as a result of both natural processes and anthropogenic activities. The broad scope of arsenic toxicity to humans and its unique interaction with the environment have led to extensive research into its physicochemical properties and toxic behavior in biological systems. The ...
2015-9-19 · Mechanisms of arsenic toxicity and carcinogenesis Obinaju, Blessing Ebele ... of arsenic in plant and human tissues (Dickerson (1980) gives an idea of possible accumulation due to exposure in these tissues. Over the years, several epidemiological ... arsenic
2012-6-6 · The two forms of inorganic arsenic, arsenate (AsV) and arsenite (AsIII), are easily taken up by the cells of the plant root. Once in the cell, AsV can be readily converted to AsIII, the more toxic of the two forms. AsV and AsIII both disrupt plant metabolism, but through distinct mechanisms. AsV is a chemical analog of phosphate that can disrupt at least some phosphate
Understanding the mechanisms involved in arsenic tolerance and accumulation of this plant provides valuable tools to improve the phytoremediation efficiency. In this review, the current knowledge about the physiological and molecular mechanisms of arsenic tolerance and accumulation in P. vittata is summarized, and an attempt has been made to ...
2020-9-5 · Arsenic (As) which is a heavy metal is ubiquitously present in soil as well as in water. As has been ranked as a potent carcinogen and is found to be very harmful to all the living beings ranging from bacteria to plant to animals as well as humans. All the organisms possess various defense mechanisms to combat such types of stresses.
2018-9-29 · 1. Overview of Arsenic Transport and Detoxiﬁcation. A schematic representation of known and putative proteins and processes involved in arsenic uptake, efﬂux, distribution, and detoxiﬁcation in plants. In plant roots, arsenite (AsIII) and arsenate (AsV) are taken up by aquaporins [nodulin-26-like intrinsic protein (NIP)] and phosphate transporters
Arsenic is likely the most talked-about metalloid in the modern world because of its toxic effects on both animal and plants. Further, arsenic pollution is now producing negative impacts on food ...
Arsenic: behavior in the environment, plant uptake mechanisms and human health risks Letuzia Oliveira IntroductionArsenic (As) is a toxic metalloid from natural sources widely distributed in
Arsenic stress during vegetative and reproductive phases of plant growth affects the growth, flowering, and fruit/grain development due to a number of physiological, biochemical, and molecular effects. The metabolism of carbon, nitrogen, and sulfur is affected along with changes in photosynthetic and respiratory processes.
2010-12-7 · Heavy metals and metalloids are toxic for living organisms through oxidative and/or genotoxic mechanisms (1). Among them, the nonessential element arsenic (As) is known to be a poison and also to promote various cancers (skin, lungs, and kidneys) in humans. Exposure to As occurs mainly by drinking contaminated water (2) or eating plant food originating from As
2018-9-29 · Molecular Mechanisms to Reduce Arsenic in Crops Emma R. Lindsay1 and Frans J.M. Maathuis1,* Arsenic is toxic to all life forms and is a potent carcinogen. Its accumulation in crop ... arsenic toxicity depresses plant growth, and hence crop yields [4,5], it is the accumulation
Table 12.1 Summary of arsenic (III, V) removal (mgg1 dry cell weight), IC50 value, and time of incubation by various macroalgae, cyanobacteria, microalgae, and diatoms reported in the literature - "Mechanisms of Arsenic Toxicity and Tolerance in Plants"
Arsenic (As), classified as a metalloid element, is well known for its carcinogenicity and other toxic effects to humans. Arsenic exposure in plants results in the alteration of the physiochemical and biological properties and consequently, loss of crop yield. Being a staple food for half of the world's po Recent Review Articles
2016-12-1 · Arsenic (As), a naturally-occurring metalloid, is not essential for plant growth, but it can accumulate in plants to toxic levels. As a result, it can enter the food chain and pose health risk to humans. Multiple mechanisms are involved in the uptake and metabolism of As in plants. The most toxic forms of this element are As III and As V.
2010-12-7 · Arsenic is an extremely toxic metalloid causing serious health problems. In Southeast Asia, aquifers providing drinking and agricultural water for tens of millions of people are contaminated with arsenic. To reduce nutritional arsenic intake through the consumption of contaminated plants, identification of the mechanisms for arsenic accumulation and
2002-11-1 · The mechanisms of arsenic (As) hyperaccumulation in Pteris vittata, the first identified As hyperaccumulator, are unknown. We investigated the interactions of arsenate and phosphate on the uptake and distribution of As and phosphorus (P), and As speciation in P. vittata.
2014-4-16 · Arsenic (As) is a toxic metalloid found ubiquitously in the environment and widely considered an acute poison and carcinogen. However, the molecular mechanisms of the plant response to As and ensuing tolerance have not been extensively characterized. Here, we report on transcriptional changes with As treatment in two Arabidopsis accessions, Col-0 and Ws-2.
Rabia Amir, Momina Hayat, Irum Nauman, Marrium Khan and Faiza Munir, Plants Adaptive Mechanisms under Arsenic Pollution, Mechanisms of Arsenic Toxicity and Tolerance in Plants, 10.1007/978-981-13-1292-2_7, (171-190), (2018).
2019-6-6 · The research published in Current Biologydescribes the genetic and cellular mechanisms of the fern and could lead to the modification of other plants that would remediate arsenic from contaminated soils more quickly and efficiently.. Guarding against effects of arsenic. Once inside cells - both human and plant arsenic leads to cell death either through oxidative
Rice consumption is a source of arsenic (As) exposure, which poses serious health risks. In this study, the accumulation of As in rice was studied. Research shows that As accumulation in rice in Taiwan and Bangladesh is higher than that in other countries. In addition, the critical factors influencing the uptake of As into rice crops are defined.
T1 - Arsenic as a food chain contaminant. T2 - mechanisms of plant uptake and metabolism and mitigation strategies. AU - Zhao, Fang-Jie. AU - McGrath, Steve P. AU - Meharg, Andrew A. PY - 2010/6/2. Y1 - 2010/6/2. N2 - Arsenic (As) is an environmental and food chain contaminant.
The arsenic is found to be predominantly as inorganic species; and it was hypothesized that the plant uptakes arsenic as arsenate wAs (V )x and arsenate was converted to arsenite wAs (III)x within the plant.The mechanisms of arsenic uptake, translocation, and transformation by this plant are not known and are the objectives of our on-going ...
2020-9-5 · In response to arsenic toxicity, the plants use various detoxification mechanisms, which include non-enzymatic and enzymatic antioxidant defense mechanisms, hyperaccumulation, and phytochelation synthesis for protection of cells and subcellular systems.
The arsenic uptake and translocation systems in plants are dependent on As species. Uptake of inorganic arsenate [Asin(V)] is conducted via specified group of high-affinity phosphate (Pi) transporters belonging to the PHS family, called Pi transporter 1. Recently identified transcription factors involved in the regulation of Asin(V) intake in plants are also described in this chapter.
2014-9-24 · Foods produced on soils impacted by Pb-Zn mining activities are a potential health risk due to plant uptake of the arsenic (As) associated with such mining. A field survey was undertaken in two Pb-Zn mining-impacted paddy fields in Guangdong Province, China to assess As accumulation and translocation, as well as other factors influencing As in twelve commonly
2020-8-21 · Bioremediation of Arsenic and Lead by Plants and Microbes from Contaminated Soil. Mohd Sayeed Akhtar 1,, Birtaut Chali 1, Tanweer Azam 2. 1 Department of Biology, College of Natural Sciences, Jimma University, Jimma, Ethiopia. 2 Department Plant Sciences and Horticulture, College of Agriculture and Veterinary Sciences, Ambo University, Ambo, Ethiopia
2015-9-19 · Mechanisms of arsenic toxicity and carcinogenesis Obinaju, Blessing Ebele ... of arsenic in plant and human tissues (Dickerson (1980) gives an idea of possible accumulation due to exposure in these tissues. Over the years, several epidemiological ... arsenic can replace phosphorous in many biochemical
2020-9-1 · Understanding the mechanisms underlying arsenic uptake by roots, the role of various transporters involved in uptake of AsV and AsIII, the role of transcription factors, reduction of AsV to AsIII in the tissues, efflux of AsIII from the cells to external environment, complexation of AsIII with thiol containing compounds, sequestration of AsIII-ligand complexes in the vacuoles, oxidative stress tolerance mechanisms in plants, has helped in identification of certain putative candidate genes ...
2018-2-1 · Arsenic resistance mechanisms in plants span a range of strategies (Ahmad et al., 2012, Tripathi et al., 2012, Gupta and Ahmad, 2014). Broadly, they can be either to assimilate less As (i.e. avoidance of As uptake), as discussed in the previous section, and/or to restrict As translocation to the shoot including seeds.
2009-6-1 · The metalloid arsenic and the heavy metal cadmium have no demonstrated biological function in plants. Both elements are highly toxic and of major concern with respect to their accumulation in soils, in the food-chain or in drinking water. Arsenate is taken up by phosphate transporters and rapidly reduced to arsenite, As (III).
2010-12-7 · Arsenic is an extremely toxic metalloid causing serious health problems. In Southeast Asia, aquifers providing drinking and agricultural water for tens of millions of people are contaminated with arsenic. To reduce nutritional arsenic intake through the consumption of contaminated plants, identification of the mechanisms for arsenic accumulation and detoxification in plants is a prerequisite.