Cadmium has contrasting effects on polyethylene glycol – Sensitive and resistant cell lines in the Mediterranean halophyte species Atriplex halimus L.

Lefèvre, Isabelle S.; Marchal, Geoffrey; Ghanem, Michel Edmond; Corréal, Enrique; Lutts, Stanley

doi:10.1016/j.jplph.2009.09.019

Cited by 43 publications

(18 citation statements)

References 53 publications

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“…A previous study performed on proliferating callus culture of Atriplex halimus indicated that the most resistant cell lines to Cd displayed a high constitutive superoxide dismutase activity and an efficient Cd‐induced increase in glutathione reductase and ascorbate peroxidase activity (Lefèvre et al . ). These results suggested that the antioxidant response is not necessarily related to any transcriptional or translational regulation, but may be related to a stimulation of enzyme activity.…”

Section: Discussionmentioning

confidence: 97%

“…After 28 d of Cd treatment, proteome analysis of Z. fabago revealed that the photosynthetic apparatus-related proteins were affected, but we observed an increase in the number of up-regulated stress-defence proteins (catalase, endo-β-1,3-glucanase, chitinase; unpublished results), underlying an evolution in the strategy of plant response with the duration of the exposure. However, the number of these stress-defence proteins remained limited in comparison with other non-hyperaccumulating species (Hossain et al 2012).A previous study performed on proliferating callus culture of Atriplex halimus indicated that the most resistant cell lines to Cd displayed a high constitutive superoxide dismutase activity and an efficient Cd-induced increase in glutathione reductase and ascorbate peroxidase activity (Lefèvre et al 2010b). These results suggested that the antioxidant response is not necessarily related to any transcriptional or translational regulation, but may be related to a stimulation of enzyme activity.…”

Section: And Zn Distribution In Syrian Beancaper 1315mentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 97%

Section: And Zn Distribution In Syrian Beancaper 1315mentioning

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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“…We cannot exclude the role of SnRK2s in the regulation of other processes involved in the plant response to this stress, for example by controlling antioxidative enzymes' and metal transporters' activity, as well as expression of various stress-related genes. It is noteworthy that osmotic stress (water deficit and salinity) influences the plant response to heavy metal stress (Lefèvre et al, 2010;Xu et al, 2010) and that the Cd 2+ -response signaling pathways overlap and cross talk with different abiotic stress pathways (Dal Corso et al, 2010). It should be stressed out that the common signaling molecules, ROS and NO, triggering and regulating plant responses to various environmental conditions are key elements contributing to activation of SnRK2s studied by a variety of abiotic stresses (e.g.…”

Section: Discussionmentioning

confidence: 99%

SNF1-Related Protein Kinases Type 2 Are Involved in Plant Responses to Cadmium Stress

et al. 2012

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Cadmium ions are notorious environmental pollutants. To adapt to cadmium-induced deleterious effects plants have developed sophisticated defense mechanisms. However, the signaling pathways underlying the plant response to cadmium are still elusive. Our data demonstrate that SnRK2s (for SNF1-related protein kinase2) are transiently activated during cadmium exposure and are involved in the regulation of plant response to this stress. Analysis of tobacco (Nicotiana tabacum) Osmotic StressActivated Protein Kinase activity in tobacco Bright Yellow 2 cells indicates that reactive oxygen species (ROS) and nitric oxide, produced mainly via an L-arginine-dependent process, contribute to the kinase activation in response to cadmium. SnRK2.4 is the closest homolog of tobacco Osmotic Stress-Activated Protein Kinase in Arabidopsis (Arabidopsis thaliana). Comparative analysis of seedling growth of snrk2.4 knockout mutants versus wild-type Arabidopsis suggests that SnRK2.4 is involved in the inhibition of root growth triggered by cadmium; the mutants were more tolerant to the stress. Measurements of the level of three major species of phytochelatins (PCs) in roots of plants exposed to Cd 2+ showed a similar (PC2, PC4) or lower (PC3) concentration in snrk2.4 mutants in comparison to wild-type plants. These results indicate that the enhanced tolerance of the mutants does not result from a difference in the PCs level. Additionally, we have analyzed ROS accumulation in roots subjected to Cd 2+ treatment. Our data show significantly lower Cd 2+ -induced ROS accumulation in the mutants' roots. Concluding, the obtained results indicate that SnRK2s play a role in the regulation of plant tolerance to cadmium, most probably by controlling ROS accumulation triggered by cadmium ions.Cadmium is one of the most toxic soil pollutants. Cadmium ions accumulate in plants and affect, via the food chain, animal and human health. In plants, cadmium is taken up by roots and is transported to aerial organs, leading to chromosomal aberrations, growth reduction, and inhibition of photosynthesis, transpiration, nitrogen metabolism, nutrient and water uptake, eventually causing plant death (for review, see DalCorso et al., 2008). Plants are challenged not only by cadmium ions themselves, but also by Cd 2+ -induced harmful effects including oxidative stress (Schützendübel et al., 2001;Olmos et al., 2003;Cho and Seo, 2005;Sharma and Dietz, 2009). The extent of the detrimental effects on plant growth and metabolism depends on the level of cadmium ions present in the surrounding environment and on the plant's sensitivity to heavy metal stress.Tolerant plants avoid heavy metal uptake and/or induce the expression of genes encoding products involved, directly or indirectly, in heavy metal binding and removal from potentially sensitive sites, by sequestration or efflux (Clemens, 2006). The best-characterized heavy metal binding ligands in plants are thiol-containing compounds metallothioneins and phytochelatins (PCs), whose production is stimulated by Cd 2+. PC...

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“…Similarly, Jordan et al [33] showed that the halophyte (Atriplex nummularia) may have greater potential to selectively phytoextract metals from contaminated soils than glycophyte (Zea mays) despite their lower growth rate. The use of halophytes to extract several toxic metals has received increasing attention since a few years [35,38,43,[73][74][75]. It has been postulated that halophytes species recruit non-selective salt-resistance mechanisms to sequester toxic ions in the vacuole and/or salt glands or trichomes [35].…”

Section: Discussionmentioning

confidence: 99%

Comparative study of Pb-phytoextraction potential in Sesuvium portulacastrum and Brassica juncea: Tolerance and accumulation

Zaier

Ghnaya

Lakhdar

et al. 2010

Journal of Hazardous Materials

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139

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Cadmium has contrasting effects on polyethylene glycol – Sensitive and resistant cell lines in the Mediterranean halophyte species Atriplex halimus L.

Cited by 43 publications

References 53 publications

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

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

SNF1-Related Protein Kinases Type 2 Are Involved in Plant Responses to Cadmium Stress

Comparative study of Pb-phytoextraction potential in Sesuvium portulacastrum and Brassica juncea: Tolerance and accumulation

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