Arsenic accumulation and distribution in relation to young seedling growth in Atriplex atacamensis Phil.

Vromman, Delphine; Flores-Bavestrello, Alejandra; Šlejkovec, Zdenka; Lapaille, Stéphanie; Teixeira-Cardoso, Carolina; Briceño, Margarita; Kumar, Mahendra; Martínez, Juan-Pablo; Lutts, Stanley

doi:10.1016/j.scitotenv.2011.09.085

Cited by 54 publications

(15 citation statements)

References 49 publications

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“…In addition, sorbitol (a sugar alcohol) and spermidine (a polyamine) were other osmoprotectants upregulated by As in P. calomelanos . The increase of the proportion of spermidine and spermine and decrease of putrescine in the polyamine pool was reported as a response to arsenate accumulation in Atriplex atacamensis (Vromman et al ).…”

Section: Discussionmentioning

confidence: 98%

Arsenic hyperaccumulation induces metabolic reprogramming in Pityrogramma calomelanos to reduce oxidative stress

Campos

Araújo

Arcanjo-Silva

et al. 2016

Physiologia Plantarum

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Arsenic (As) pollution is a major environmental concern due to its worldwide distribution and high toxicity to organisms. The fern Pityrogramma calomelanos is one of the few plant species known to be able to hyperaccumulate As, although the mechanisms involved are largely unknown. This study aimed to investigate the metabolic adjustments involved in the As-tolerance of P. calomelanos. For this purpose, ferns with five to seven fronds were exposed to a series of As concentrations. Young fronds were used for biochemical analysis and metabolite profiling using gas chromatography-mass spectrometry. As treatment increased the total concentration of proteins and soluble phenols, enhanced peroxidase activities, and promoted disturbances in nitrogen and carbon metabolism. The reduction of the glucose pool was one of the striking responses to As. Remarkable changes in amino acids levels were observed in As-treated plants, including those related to biosynthesis of glutathione and phenols, osmoregulation and two photorespiratory intermediates. In addition, increases in polyamines levels and antioxidant enzyme activities were observed. In summary, this study indicates that P. calomelanos tolerates high concentration of As due to its capacity to upregulate biosynthesis of amino acids and antioxidants, without greatly disturbing central carbon metabolism. At extremely high As concentrations, however, this protective mechanism fails to block reactive oxygen species production, leading to lipid peroxidation and leaf necrosis.

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Section: Discussionmentioning

confidence: 98%

Arsenic hyperaccumulation induces metabolic reprogramming in Pityrogramma calomelanos to reduce oxidative stress

Campos

Araújo

Arcanjo-Silva

et al. 2016

Physiologia Plantarum

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“…For total acid soluble non‐protein thiol (TAST) quantification in elongating leaves, 150 mg of frozen samples were ground in liquid nitrogen to a fine powder and then extracted according to Vromman et al . () using Ellman's reagent. The absorbance at 412 nm was recorded after 2 min.…”

Section: Methodsmentioning

confidence: 99%

Differential cadmium and zinc distribution in relation to their physiological impact in the leaves of the accumulatingZygophyllum fabago L.

Lefèvre

Vogel‐Mikuš

Jeromel

et al. 2013

Plant Cell & Environment

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Cadmium and zinc share many similar physiochemical properties, but their compartmentation, complexation and impact on other mineral element distribution in plant tissues may drastically differ. In this study, we address the impact of 10 μM Cd or 50 μM Zn treatments on ion distribution in leaves of a metallicolous population of the non-hyperaccumulating species Zygophyllum fabago at tissue and cell level, and the consequences on the plant response through a combined physiological, proteomic and metabolite approach. Microproton-induced X-ray emission and laser ablation inductively coupled mass spectrometry analyses indicated hot spots of Cd concentrations in the vicinity of vascular bundles in response to Cd treatment, essentially bound to S-containing compounds as revealed by extended X-ray absorption fine structure and non-protein thiol compounds analyses. A preferential accumulation of Zn occurred in vascular bundle and spongy mesophyll in response to Zn treatment, and was mainly bound to O/N-ligands. Leaf proteomics and physiological status evidenced a protection of photosynthetically active tissues and the maintenance of cell turgor through specific distribution and complexation of toxic ions, reallocation of some essential elements, synthesis of proteins involved in photosynthetic apparatus or C-metabolism, and metabolite synthesis with some specificities regarding the considered heavy metal treatment.

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“…In Cd-treated G. max, stomata closure contributed to an elevated RWC under conditions of lower leaf water availability evoked by an increase in root resistance (Marchiol et al 1996). Studies on As accumulation and distribution in Atriplex atacamensis have revealed that young seedlings close their stomata for osmotic regulation to avoid secondary water stress (Vromman et al 2011). It was indicated that P. guajava responds to low Ni concentration by means of a significant decrease in stomatal conductance and transpiration, and was able to maintain a growth rate similar to that of control plants (Bazihizina et al 2015).…”

Section: Effects Of Heavy Metals On Transpiratory Water Lossmentioning

confidence: 99%

Water relations in plants subjected to heavy metal stresses

2016

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Concentrations of heavy metals in soil seldom reach a level sufficient to cause osmotic disturbances in plants. It is likely that water entry to the roots is indirectly governed by other factors which are themselves affected by metals. Decreased elongation of the primary root, impaired secondary growth, increased root dieback, or reduced root hair caused by toxic ions all exert a deleterious effect on the root-absorbing area and water uptake. Moreover, metals are able to decelerate short-distance water transfer both in symplast and apoplast, which in turn reduce the movement of water into the vascular system and affect water supply to the shoot. Long-distance transport is limited also due to decreased hydraulic conductivity in the root, stem and leaf midrib caused by a reduction in the size of vessels and tracheids, and partial blockage of xylem elements by cellular debris or gums. Heavy metals influence water delivery to the shoot due to inhibition of transpiration as they decrease the size of the leaves and the thickness of the lamina, reduce intercellular spaces, affect the density of stomata and decrease their aperture. Stomata closure is induced by direct interaction of toxic metals with guard cells and/or as a consequence of the early effects of metal toxicity on roots and stems. In metal-stressed plants, rootderived ABA or ABA-induced signals might play a role in stomatal movement. Disturbances in water relations trigger differential regulation of aquaporin gene expression, which may contribute to further reductions in water loss.

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Arsenic accumulation and distribution in relation to young seedling growth in Atriplex atacamensis Phil.

Cited by 54 publications

References 49 publications

Arsenic hyperaccumulation induces metabolic reprogramming in Pityrogramma calomelanos to reduce oxidative stress

Arsenic hyperaccumulation induces metabolic reprogramming in Pityrogramma calomelanos to reduce oxidative stress

Differential cadmium and zinc distribution in relation to their physiological impact in the leaves of the accumulatingZygophyllum fabago L.

Water relations in plants subjected to heavy metal stresses

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