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Author: search.filters.author.Sidhu, G.P.S.Has files: Yes

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    Alterations in photosynthetic pigments, protein, and carbohydrate metabolism in a wild plant Coronopus didymus L. (Brassicaceae) under lead stress
    (Polish Academy of Sciences, 2017) Sidhu, G.P.S.; Singh, H.P.; Batish, Daizy R.; Kohli, R.K.
    Coronopus didymus has been emerged as a promising wild, unpalatable plant species to alleviate lead (Pb) from the contaminated soils. This work investigated the hypothesis regarding various metabolic adaptations of C. didymus under lead (Pb) stress. In pot experiments, we assessed the effect of Pb at varied concentrations (500?2900?mg?kg?1) on growth, photosynthetic pigments, alteration of macromolecular (protein and carbohydrate) content, and activities of enzymes like protease, ?-and ?-amylase, peroxidase (POX), and polyphenol oxidase (PPO) in C. didymus for 6?weeks. Results revealed that Pb exposure enhanced the growth, protein, and carbohydrate level, but decreased the leaf pigment concentration and activities of hydrolytic enzymes. The activities of POX and PPO in roots increased progressively by ~337 and 675%, respectively, over the control, at 2900?mg?kg?1 Pb treatment. Likewise, contemporaneous findings were noticed in shoots of C. didymus, strongly indicating its inherent potential to cope Pb-induced stress. Furthermore, the altered plant biochemical status and upregulated metabolic activities of POX and PPO indulged in polyphenol peroxidation elucidate their role in allocating protection and conferring resistance against Pb instigated stress. The current work suggests that stress induced by Pb in C. didymus stimulated the POX and PPO activities which impart a decisive role in detoxification of peaked Pb levels, perhaps, by forming physical barrier or lignifications. ? 2017, Franciszek G?rski Institute of Plant Physiology, Polish Academy of Sciences, Krak
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    Tolerance and hyperaccumulation of cadmium by a wild, unpalatable herb Coronopus didymus (L.) Sm. (Brassicaceae)
    (Academic Press, 2017) Sidhu, G.P.S.; Singh, H.P.; Batish, Daizy R.; Kohli, R.K.
    The potential of a wild, unpalatable plant Coronopus didymus was investigated for the first time in terms of its capability to tolerate and accumulate cadmium (Cd) for phytoremediation purposes. A screenhouse experiment for 6 weeks was conducted to evaluate the effect of Cd from 100 to 400?mg?kg?1 on growth, biomass, photosynthetic apparatus, Cd uptake and accumulation in C. didymus plants. Application of Cd facilitates the growth of the plants whereas at higher levels a slight reduction was noticed. The concentration of Cd in roots and shoots reached a maximum of 867.2 and 864.5?mg?kg?1 DW respectively, at 400?mg?kg?1?Cd treatment. Cd exposure increased the generation of superoxide anion (O2??), H2O2 content, MDA level and antioxidative response (SOD, CAT and POD) in roots and shoots of C. didymus. However, a slight decline in SOD and CAT activities were noticed in roots at highest Cd treatment (400?mg?kg?1). The bioconcentration (BCF) values for all the concentrations were ?1 and the translocation factor (TF) values were ? 1 at lower level but reached 1 at highest Cd concentration. Thus, C. didymus satisfies the conditions required for hyperaccumulator plants and may be practically employed to alleviate Cd from contaminated soils. ? 2016 Elsevier Inc.