Alleviation of nickel toxicity in finger millet ( Eleusine coracana L.) germinating seedlings by exogenous application of salicylic acid and nitric oxide

Kotapati, Kasi Viswanath; Palaka, Bhagath Kumar; Ampasala, Dinakara Rao

doi:10.1016/j.cj.2016.09.002

Cited by 90 publications

(16 citation statements)

References 44 publications

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“…SNP application strengthened the ROS elimination mechanisms by upregulating the antioxidant system functioning and the content of redox components, including AsA and GSH with apparent effects at 100 µM NO. The authors of [25,35] also reported increased activity of antioxidant enzymes due to NO application. Increased antioxidant functioning due to NO application prevents the oxidative effects on the structure and function of chloroplast thylakoids [17].…”

Section: Discussionmentioning

confidence: 96%

“…Exogenously supplied SNP has been reported to help different crop species to withstand growth restrictions under stress, and such changes have been ascribed to its key role in signaling and elicitation of tolerance mechanisms [18,24]. Applied SNP mitigates the Ni-induced deleterious effects by interacting with other molecules, including phytohormones like salicylic acid [25]. In the present study, the beneficial role of applied NO was confirmed using the scavenger, PTIO ( Figure 6) depicting its active involvement in cellular division, differentiation, and elongation.…”

Section: Discussionmentioning

confidence: 99%

“…Abiotic stresses trigger chlorophyll degradation by activating chlorophyllase activity and down-regulating chlorophyll biosynthesis [13,29]. In addition, Ni-mediated decline in Mg [25], and N [5] uptake may have contributed significantly to reduced synthesis of chlorophyll and Rubisco reflecting in declined photosynthesis and production of photoassimilates therefore restricting the growth. In the present study, it was observed that the positive effect of NO on photosynthesis was equally reversed due to PTIO treatment depicting its involvement in the alleviation of Ni-mediated photosynthetic inhibition.…”

Section: Discussionmentioning

confidence: 99%

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Exogenous Nitric Oxide Mitigates Nickel-Induced Oxidative Damage in Eggplant by Upregulating Antioxidants, Osmolyte Metabolism, and Glyoxalase Systems

Soliman

Alhaithloul

Hakeem

et al. 2019

Plants

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Nitric oxide (NO) at optimal levels is considered beneficial to plant functioning. The present study was carried out to investigate the role of exogenously applied NO (100 and 150 µM sodium nitropurusside, SNP) in amelioration of nickel (Ni)-mediated oxidative effects in eggplant. Ni stress declined growth and biomass production, relative water content (RWC), and chlorophyll pigment synthesis, thereby affecting the photosynthetic efficiency. Exogenously applied SNP proved beneficial in mitigating the Ni-mediated growth restrictions. NO-treated seedlings exhibited improved photosynthesis, stomatal conductance, and chlorophyll content with the effect of being apparent at lower concentration (100 µM SNP). SNP upregulated the antioxidant system mitigating the oxidative damage on membranes due to Ni stress. The activity of superoxide dismutase, catalase, glutathione S-transferase, ascorbate peroxidase, and glutathione reductase was upregulated due to SNP which also increased the ascorbate and reduced glutathione content. SNP-supplied seedlings also showed higher proline and glycine betaine accumulation, thereby improving RWC and antioxidant system. Glyoxalase I activity was induced due to SNP application declining the accumulation of methylglyoxal. NO-mediated mitigation of Ni toxicity was confirmed using NO scavenger (PTIO,4,5,, which reversed the influence of SNP almost entirely on the parameters studied. Uptake of nitrogen (N), potassium (K), and calcium (Ca) was increased due to SNP application and Ni was reduced significantly. Therefore, this study revealed the efficiency of exogenous SNP in enhancing Ni stress tolerance through upregulating antioxidant and glyoxalase systems.

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Section: Discussionmentioning

confidence: 96%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Exogenous Nitric Oxide Mitigates Nickel-Induced Oxidative Damage in Eggplant by Upregulating Antioxidants, Osmolyte Metabolism, and Glyoxalase Systems

Soliman

Alhaithloul

Hakeem

et al. 2019

Plants

View full text Add to dashboard Cite

show abstract

“…Nitric oxide (NO) is a gaseous signaling molecule, which is involved in many biochemical and physiological processes in plants under biotic and abiotic stresses (Kotapati et al 2017). Improved drought tolerance by NO is associated with its ability to reduce oxidative stress by promoting some physiological and biochemical processes such as photosynthesis, osmolyte accumulation, and antioxidant activity in plants (Silveira et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Exogenous Nitric Oxide Improves the Protective Effects of TiO2 Nanoparticles on Growth, Antioxidant System, and Photosynthetic Performance of Wheat Seedlings Under Drought Stress

Faraji

Sepehri

2020

J Soil Sci Plant Nutr

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Drought stress is one of the most important environmental constraints that negatively affect crop growth and production worldwide. Recently, nanotechnology has increasingly been applied to improve tolerance in plants exposed to abiotic stresses such as drought. A pot experiment was conducted to examine the influence of nitric oxide donor sodium nitroprusside (SNP: 100 μM) in presence of TiO 2 nanoparticles (TiO 2 NPs: 500, 1000, and 2000 mg kg −1) on wheat seedlings under drought stress conditions. Water deficit negatively affected growth and photosynthetic parameters with simultaneous increase in activity of antioxidant enzymes. Under severe drought stress, soil-applied 2000 mg kg −1 TiO 2 NPs enhanced seedling dry weight (DW), relative water content (RWC), catalase (CAT) activity, ascorbate peroxidase (APX) activity, and proline content. Moreover, 2000 mg kg −1 TiO 2 NPs enhanced total chlorophyll (total Chl), carotenoids (Car), stomatal conductance (gs), and transpiration (E) under severe drought stress. However, addition of 100 μM SNP in presence of 2000 mg kg −1 TiO 2 NPs significantly increased seedling length (SL), superoxide dismutase (SOD) activity, total soluble proteins, net photosynthetic rate (Pn), and intercellular CO 2 concentration (Ci). The aforementioned treatment also significantly reduced hydrogen peroxide (H 2 O 2) and malondialdehyde (MDA) contents under severe drought stress. Our results suggest that foliar application of SNP in the presence of TiO 2 NPs can protect wheat seedlings against drought-induced oxidative damage.

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“…In bean ( Phaseolus vulgaris ), NO donor sodium nitroprusside likewise successfully attenuated oxidative stress triggered by Ni exposure [ 63 ]. In addition, in finger millet ( Eleusine coracana ) exogenous application of NO (especially together with salicilic acid) was also able to reduce the toxic effect of excess Ni [ 64 ]. These findings can be set in parallel with the Ni-induced NO accumulation observed in the root tips, coupled with the relative higher tolerance of the Ampeliko ecotype, compared to Loutra in our experiments.…”

Section: Resultsmentioning

confidence: 99%

Different Nitro-Oxidative Response of Odontarrhena lesbiaca Plants from Geographically Separated Habitats to Excess Nickel

et al. 2020

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Odontarrhena lesbiaca is an endemic species to the serpentine soils of Lesbos Island (Greece). As a nickel (Ni) hyperaccumulator, it possesses an exceptional Ni tolerance; and it can accumulate up to 0.2–2.4% Ni of its leaves’ dry weight. In our study, O. lesbiaca seeds from two geographically separated study sites (Ampeliko and Loutra) were germinated and grown on control and Ni-containing (3000 mg/kg) soil in a rhizotron system. Ni excess induced significant Ni uptake and translocation in both O. lesbiaca ecotypes and affected their root architecture differently: plants from the Ampeliko site proved to be more tolerant; since their root growth was less inhibited compared to plants originated from the Loutra site. In the roots of the Ampeliko ecotype nitric oxide (NO) was being accumulated, while the degree of protein tyrosine nitration decreased; suggesting that NO in this case acts as a signaling molecule. Moreover, the detected decrease in protein tyrosine nitration may serve as an indicator of this ecotype’s better relative tolerance compared to the more sensitive plants originated from Loutra. Results suggest that Ni hypertolerance and the ability of hyperaccumulation might be connected to the plants’ capability of maintaining their nitrosative balance; yet, relatively little is known about the relationship between excess Ni, tolerance mechanisms and the balance of reactive nitrogen species in plants so far.

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Alleviation of nickel toxicity in finger millet ( Eleusine coracana L.) germinating seedlings by exogenous application of salicylic acid and nitric oxide

Cited by 90 publications

References 44 publications

Exogenous Nitric Oxide Mitigates Nickel-Induced Oxidative Damage in Eggplant by Upregulating Antioxidants, Osmolyte Metabolism, and Glyoxalase Systems

Exogenous Nitric Oxide Mitigates Nickel-Induced Oxidative Damage in Eggplant by Upregulating Antioxidants, Osmolyte Metabolism, and Glyoxalase Systems

Exogenous Nitric Oxide Improves the Protective Effects of TiO2 Nanoparticles on Growth, Antioxidant System, and Photosynthetic Performance of Wheat Seedlings Under Drought Stress

Different Nitro-Oxidative Response of Odontarrhena lesbiaca Plants from Geographically Separated Habitats to Excess Nickel

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