1H and 31P NMR investigation of gadolinium uptake in maize roots

Quiquampoix, Hervé; Ratcliffe, George; Ratković, S.; Vučinić, Željko

doi:10.1016/0162-0134(90)80002-f

Cited by 55 publications

(29 citation statements)

References 16 publications

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“…The evidence is that REE phosphate precipitation from solution yields REE fractionation features of MREE enrichment and M-type tetrad effect in the precipitate (32), which are similar to those found in wheat roots (see Supporting Information, Figure S3). The coexistence of REE ions (La 3+ , Gd 3+ , and Yb 3+ ) with phosphate was also verified in root-tip portions of rice and pea (33) and in maize roots (34). XAS investigation shows that not only phosphate precipitation, but also cell wall absorption, might play an important role in REE fractionations in wheat roots.…”

Section: Fractionation Mechanisms Of Rees In Rootsmentioning

confidence: 72%

Fractionation Mechanisms of Rare Earth Elements (REEs) in Hydroponic Wheat: An Application for Metal Accumulation by Plants

Ding

Liang

Zhang

et al. 2006

Environ. Sci. Technol.

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Fractionations of rare earth elements (REEs) in wheat (Triticum aestivum L.) were observed through application of exogenous mixed REEs under hydroponic conditions. Middle REE (MREE), light REE (LREE), and heavy REE (HREE) enrichments were found in roots, stems, and leaves, respectively, accompanied by the tetrad effect (an effect that can cause a split of REE patterns into four consecutive segments) in these organs. Investigations into REE speciation in roots and in the xylem sap with X-ray absorption spectroscopy (XAS) and nanometer-sized TiO 2 adsorption techniques, associated with other controlled experiments, demonstrated that REE fractionations in wheat were caused by the combined effects of chemical precipitation, cell wall absorption, and solution complexation by organic ligands in the xylem vessels. REE fractionations in wheat, which were derived from the small differences of chemical properties across REE series, may reflect a sensitive internal chemical environment that influences plant accumulation for REEs and their analogues actinide radionuclides.

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Section: Fractionation Mechanisms Of Rees In Rootsmentioning

confidence: 72%

Fractionation Mechanisms of Rare Earth Elements (REEs) in Hydroponic Wheat: An Application for Metal Accumulation by Plants

Ding

Liang

Zhang

et al. 2006

Environ. Sci. Technol.

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“…Therefore, we suggest that the increased [Ca 2ϩ ] cyt observed in transformed tobacco seedlings during HS arises from both extracellular and intracellular sources. However, since ruthenium red-sensitive channels also occur in plant plasma membranes (Marshall et al, 1994) and lanthanum may enter into plant cells (Quiquampoix et al, 1990), these conclusions must be made tentatively.…”

Section: Discussionmentioning

confidence: 99%

Heat-Shock-Induced Changes in Intracellular Ca2+Level in Tobacco Seedlings in Relation to Thermotolerance1

et al. 1998

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Exposure of plants to elevated temperatures results in a complexThe responses of plants to HS have received increasing attention in recent years. Elevated temperatures initiate changes in transcription and selective translation of HS mRNA encoding HSPs, thereby enhancing thermotolerance of treated plants (Nover et al., 1989; Nover, 1991;Vierling, 1991; Howarth and Ougham, 1993;Waters et al., 1996). However, the pathways by which HS signals are perceived and transduced to activate gene expression of HSPs and to induced thermotolerance are not understood.In recent years a second-messenger Ca 2ϩ was found to be involved in the perception and regulation of many responses of plants to environmental signals (Gilroy et al., 1993; Poovaiah and Reddy, 1993; Gilroy and Trewavas, 1994; Bush, 1995;Braam et al., 1996;Webb et al., 1996). [Ca 2ϩ ] cyt often shows significant changes in plant cells under the influence of various stress signals such as touch, wind stimulation, cold shock, wounding, and mechanical stimulation (Knight et al., 1991(Knight et al., , 1992(Knight et al., , 1993 Haley et al., 1995;Campbell et al., 1996; Polisensky and Braam, 1996), oxidative stress (Price et al., 1994), salinity (Lynch et al., 1989; Bush, 1996; Okazaki et al., 1996), anoxia (Subbaiah et al., 1994a; Bush, 1996;Sedbrook et al., 1996), and hypoosmotic shock (Takahashi et al., 1997). It has been suggested that a stress-induced change in [Ca 2ϩ ] cyt might be one of the primary transduction mechanisms whereby gene expression and biochemical events are altered to adapt plant cells to environmental stresses (Monroy et al., 1993;Subbaiah et al., 1994aSubbaiah et al., , 1994b Monroy and Dhindsa, 1995;Braam et al., 1996).Several authors have suggested that Ca 2ϩ -mediated second-messenger systems might be involved in the HS responses of animal cells (Lamarche et al., 1985; Calderwood et al., 1988; Landry et al., 1988; Mosser et al., 1990), although other results indicated that Ca 2ϩ was not strictly required for some HSP synthesis (Drummond et al., 1986(Drummond et al., , 1988. In plant cells Klein and Ferguson (1987) observed that the uptake of Ca 2ϩ by suspension-cultured pear cells or protoplasts was significantly enhanced during heat stress. Braam (1992) demonstrated that HS induced a strongly up-regulated expression of calmodulin-related TCH genes in cultured Arabidopsis cells, and external Ca 2ϩ was required for maximal HS induction of these TCH genes. Wu et al. (1992) also indicated that pretreatment of hypocotyl segments and etiolated seedlings of Brassica napus with the Ca 2ϩ ionophore A23187 or the Ca 2ϩ chelator EGTA to modify Ca 2ϩ homeostasis resulted in changes in the synthesis of HSPs. Using the fluorescent dye Indo-1, Biyaseheva et al. (1993) reported that HS induced a 4-fold increase in [Ca 2ϩ ] cyt in pea mesophyll protoplasts, but the further dynamic changes in [Ca 2ϩ ] cyt during HS could not be detected because of limitations in the technique.We recently described a novel technology to measure [Ca 2ϩ ] ...

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“…In addition, little consensus has yet been reached regarding the life cycle of REEs in plant cells. Some studies report that REEs cannot enter the plant cells but only be localized in apoplast (8)(9)(10)(11)(12)(13)(14); other studies, however, argue that REEs cannot only enter the plant cells, but also be deposited inside the cells, such as in the membranes of chloroplast, vacuole, cytoplasm, and nucleus (15)(16)(17)(18)(19)(20)(21). The discrepancy may be because of different experimental methods and different concentrations of REE ions used in separate studies.…”

mentioning

confidence: 99%

Rare earth elements activate endocytosis in plant cells

Wang

Zhou

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

125

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It has long been observed that rare earth elements (REEs) regulate multiple facets of plant growth and development. However, the underlying mechanisms remain largely unclear. Here, using electron microscopic autoradiography, we show the life cycle of a light REE (lanthanum) and a heavy REE (terbium) in horseradish leaf cells. Our data indicate that REEs were first anchored on the plasma membrane in the form of nanoscale particles, and then entered the cells by endocytosis. Consistently, REEs activated endocytosis in plant cells, which may be the cellular basis of REE actions in plants. Moreover, we discovered that a portion of REEs was successively released into the cytoplasm, self-assembled to form nanoscale clusters, and finally deposited in horseradish leaf cells. Taken together, our data reveal the life cycle of REEs and their cellular behaviors in plant cells, which shed light on the cellular mechanisms of REE actions in living organisms.activation | endocytic vesicle S ome trace elements, such as rare earth elements (REEs), have been observed for a long time to be beneficial to plant growth (1, 2). REEs are f-block elements in the periodic table, including 15 lanthanides, plus scandium and yttrium (2). The beneficial effect of REEs on plants was first reported in 1917, when it was found that cerium, an REE, improved physiological activities of water-floss (Spirogyra) (3). Since the 1970s, REEs have been widely used in agriculture as plant growth stimulants (4). Currently, more than 100 of crop species have been applied with REEs, which has increased crop yields by 5-15% (4). In addition, REEs also serve to protect plants against certain plant diseases and some stresses, such as drought, cold, acid rain, or heavy metals (2). The wide use of REEs has caused an overaccumulation of REEs in the ecosystem, including soil (5), atmosphere (6), and water (7). Moreover, it was shown that REEs have dual effects on plant growth: low concentrations of REEs exert positive effects on growth and yield of crops, whereas high concentrations of REEs seem to be harmful for plants, indicating that REEs are not absolutely good for plants (2). Therefore, it is imperative to elucidate how REEs act on plant cells to ensure food safety.Despite of many advances achieved in recent years, the action mechanisms of REEs on plant cells still remain poorly understood (2). Several explanations, which are mainly focused on the physiological roles of REEs in plant cells, have been proposed (2). These mechanisms include the possible changes of photosynthesis, mineral nutrient uptake and metabolism, catalytic activities of some enzymes, hormonal balance, and so forth (2). However, these hypotheses are not connected to any cellular or molecular principles and are therefore far from explaining the action mechanisms of REEs in plants (2,8). In addition, little consensus has yet been reached regarding the life cycle of REEs in plant cells. Some studies report that REEs cannot enter the plant cells but only be localized in apoplast (8-14); other st...

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1H and 31P NMR investigation of gadolinium uptake in maize roots

Cited by 55 publications

References 16 publications

Fractionation Mechanisms of Rare Earth Elements (REEs) in Hydroponic Wheat: An Application for Metal Accumulation by Plants

Fractionation Mechanisms of Rare Earth Elements (REEs) in Hydroponic Wheat: An Application for Metal Accumulation by Plants

Heat-Shock-Induced Changes in Intracellular Ca2+Level in Tobacco Seedlings in Relation to Thermotolerance1

Rare earth elements activate endocytosis in plant cells

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