Arsenic uptake and metabolism in plants.
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1,509 citations
Cites background from "Arsenic uptake and metabolism in pl..."
...Storage of As as inorganic arsenite in vacuoles is a key mechnism found in fronds of hyperaccumulator ferns, although the ransport system located at the tonoplast has not been identified et [87]....
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...Thus a high expression of such proteins might conceivably account for the arsenite transfer from root cell cytoplasm to xylem vessels in As hyperaccumulators [87]....
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1,025 citations
745 citations
Cites background from "Arsenic uptake and metabolism in pl..."
...Finally, because aquaglyceroporins mediate facilitated diffusion and not active transport, Lsi1 can mediate efflux of As(III) as well (Figure 2), a process that has been observed in several plant species (146)....
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...This difference is reflected in our article, which emphasizes the substantial progress made since several excellent reviews discussed the detoxification and accumulation of As and Cd by plants (81, 129, 146, 148)....
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...As(III) is the dominant As species in the xylem of most plants analyzed to date (129, 146)....
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703 citations
Cites background from "Arsenic uptake and metabolism in pl..."
...As(V) accounts for a variable but considerable fraction of the total xylem As of nonhyperaccumulators although As(III) is always more abundant than As(V) [54,8 ]....
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...vittata, xylem As is almost exclusively present as As(III), and As(III) efflux from roots into the rhizosphere is negligible, compared to non-As-hyperaccumulators (reviewed in [8 ]) (Figure 1)....
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...adapted from [8 ]....
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...As(V) is potentially toxic because it can substitute for phosphate in phosphorylation reactions, including ATP synthesis [8 ]....
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...vittata, hardly any As(III) efflux was observed (Figure 1) (reviewed in [8 ])....
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645 citations
Cites background or methods from "Arsenic uptake and metabolism in pl..."
...It can compete with phosphate during phosphorylation reactions, leading to the formation of AsV adducts that are often unstable and short-lived....
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...In the fronds, AsIII is sequestered as free AsIII in the vacuole (Lombi et al., 2002; Pickering et al., 2006), where it accumulates to extremely high levels (Zhao et al., 2009)....
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...The rapid rate of uptake and translocation to the frond and a higher antioxidant capacity to maintain lower ROS levels (Cao et al., 2004; Zhao et al., 2009), perhaps coupled with relatively rapid dilution in the bulk of the aerial tissues, together seem to provide the hyperaccumulators with…...
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...Of the small portion of As that is translocated, no more than 40% would be expected to be in the form of AsV, based on As speciation determinations in a number of species (Zhao et al., 2009)....
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...Conversely, Pi fertilization can protect plants, including the hyperaccumulator P. vittata, from AsV toxicity (Tu and Ma, 2003)....
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References
1,704 citations
"Arsenic uptake and metabolism in pl..." refers background in this paper
...Since the first discovery of As hyperaccumulation in P. vittata (Ma et al., 2001), a total of 12 As hyperaccumulators have been identified, all of them belonging to the Pteridaceae family of ferns and most being found within the Pteris genus (Supporting Information Table S1)....
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...vittata (Ma et al., 2001), a total of 12 As hyperaccumulators have been identified, all of them belonging to the Pteridaceae family of ferns and most being found within the Pteris genus (Supporting Information Table S1)....
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...Meanwhile, the discovery of As-hyperaccumulating fern species (Ma et al., 2001) has attracted much attention and further research focusing on understanding the mechanisms behind this extraordinary phenomenon and evaluation of the phytoremediation potential of various As hyperaccumulators....
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1,471 citations
"Arsenic uptake and metabolism in pl..." refers background in this paper
...In addition, Si application can increase rice yield by alleviating biotic and abiotic stresses (Ma & Yamaji, 2006)....
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1,469 citations
1,398 citations
"Arsenic uptake and metabolism in pl..." refers background in this paper
...They are sometimes called aquaglyceroporins (Wallace et al., 2006), although some of the NIPs (e.g. OsNIP2;1) have little permeability to glycerol (Ma et al., 2006; Mitani et al., 2008), and there is no direct evidence for a physiological role in plants of glycerol transport through NIPs (Bienert…...
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...Recently, Ma et al. (2008) have identified OsNIP2;1, also named Lsi1 because of its primary function as a silicon (Si) transporter (Ma et al., 2006), as a major pathway for the entry of arsenite into rice roots....
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...Lsi1 is strongly expressed in rice roots and its expression is further enhanced in plants not supplied with Si (Ma et al., 2006)....
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...(2008) have identified OsNIP2;1, also named Lsi1 because of its primary function as a silicon (Si) transporter (Ma et al., 2006), as a major pathway for the entry of arsenite into rice roots....
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...Therefore, the pathway of Si transport from the external medium to the stele involves the influx of silicic acid mediated by the aquaporin channel Lsi1 (Ma et al., 2006), and the efflux of Si towards the stele mediated by Lsi2 (Ma et al....
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1,181 citations
"Arsenic uptake and metabolism in pl..." refers background or result in this paper
...Recently, Ma et al. (2008) have identified OsNIP2;1, also named Lsi1 because of its primary function as a silicon (Si) transporter (Ma et al., 2006), as a major pathway for the entry of arsenite into rice roots....
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...Ma et al. (2008) showed that, in addition to Lsi1, three other NIP channel proteins in rice, OsNIP1;1, OsNIP2;2 (also named Lsi6) and OsNIP3;1, are also able to mediate arsenite influx into X. laevis oocytes expressing these genes....
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...While Lsi1 transports arsenite into rice root cells, a different transporter, Lsi2, has been found to mediate arsenite efflux in the direction of xylem (Ma et al., 2008) (Fig....
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...NIPs have low to no water permeability and the ability to transport multiple uncharged solutes of varying sizes including glycerol, urea, ammonia, boric acid and silicic acid (Wallace et al., 2006), as well as arsenite (Bienert et al., 2008b; Isayenkov & Maathuis, 2008; Ma et al., 2008)....
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...Recently, evidence that some plant aquaporin channels can mediate arsenite influx has been obtained from three independent studies (Bienert et al., 2008b; Isayenkov & Maathuis, 2008; Ma et al., 2008)....
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