Silicon-mediated alleviation of Cr(VI) toxicity in wheat seedlings as evidenced by chlorophyll florescence, laser induced breakdown spectroscopy and anatomical changes

Tripathi, Durgesh Kumar; Singh, Vijay Pratap; Prasad, Sheo Mohan; Chauhan, Devendra Kumar; Dubey, Nawal Kishore; Kumar, Awadhesh

doi:10.1016/j.ecoenv.2014.09.029

Cited by 168 publications

(55 citation statements)

References 53 publications

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“…On contrary, the addition of Si and SiNp significantly (P < 0.05) reduced toxicity level of As V in maize cultivar and hybrid by ameliorating As V -induced negative effects on growth, pigments, photosynthetic process and protein, which was accompanied by a decreased level of As accumulation (Figure 3; Table 1). Simediated alleviation of As V toxicity complies with mechanisms, which were reported in earlier studies (Horiguchi and Morita, 1987;Tripathi et al, 2015;Wang et al, 2015). Regarding SiNp-mediated alleviation of As V toxicity, somewhat similar mechanisms have been observed as reported for Si.…”

Section: Discussionsupporting

confidence: 60%

“…Several studies demonstrated that Si has numerous direct and indirect beneficial impacts on plant growth and development. For instance, it appreciably enhances resistance of plants to several toxic metals such as aluminum (Al), chromium (Cr), cadmium (Cd) iron (Fe), manganese (Mn), and zinc (Zn) (Horiguchi and Morita, 1987;Shi et al, 2005;Singh et al, 2011;Tripathi et al, 2012Tripathi et al, , 2015. There may be various strategies by which exogenous application of Si affects heavy metal resistance in plant species.…”

Section: Introductionmentioning

confidence: 99%

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Silicon Nanoparticles More Efficiently Alleviate Arsenate Toxicity than Silicon in Maize Cultiver and Hybrid Differing in Arsenate Tolerance

Tripathi

Singh

et al. 2016

Front. Environ. Sci.

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Alleviation of abiotic stress by silicon (Si) is well documented. But mitigation of abiotic stress by silicon nanoparticles (SiNPs) is not much known. Therefore, hydroponic experiments were conducted to investigate if SiNPs are more effective than Si in mitigation of arsenate (As V ; 25 and 50 µM) toxicity in maize cultivar and hybrid differing in As V tolerance. Under As V stress, reduction in growth was accompanied by enhanced level of As and oxidative stress. As V inhibited activities of antioxidant enzymes like ascorbate peroxidase, glutathione reductase, and dehydroascorbate reductase (except superoxide dismutase). The redox status of ascorbate and glutathione was disturbed by As V as indicated by a steep decline in their reduced/oxidized ratios. However, addition of Si and SiNp ameliorates As V toxicity in maize. Si and SiNp both could reduce As V toxicity in maize cultivar and hybrid, which could be related with decreased accumulation of As and oxidative stress, and enhanced components of the ascorbate-glutathione cycle (AsA-GSH cycle). But lowering in the accumulation of As and oxidative stress markers, and enhancement in components of the AsA-GSH cycle was prominent in SiNp fed seedlings under As V stress. The results also showed that SiNp are more effective in reducing As V toxicity than Si, which is due to their greater availability to seedlings. Comparing responses of cultivar and hybrid, maize cultivar shows more resistance against As V than hybrid.

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Section: Discussionsupporting

confidence: 60%

Section: Introductionmentioning

confidence: 99%

Silicon Nanoparticles More Efficiently Alleviate Arsenate Toxicity than Silicon in Maize Cultiver and Hybrid Differing in Arsenate Tolerance

Tripathi

Singh

et al. 2016

Front. Environ. Sci.

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289

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“…2008) and under Al, Cr and As toxicity in rice, mungbean, wheat and barley (Singh et al 2011;Ali et al 2013;Sanglard et al 2014;Tripathi et al 2015). These positive effects of Si are attributed to enhancement in gas exchange attributes and photosynthetic pigments under metal toxicity.…”

Section: Introductionmentioning

confidence: 86%

Silicon ameliorates manganese toxicity by regulating both physiological processes and expression of genes associated with photosynthesis in rice (Oryza sativa L.)

Song

et al. 2015

Plant Soil

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Background and aims We investigated the effects of silicon (Si) on chlorophyll concentration, photosynthesis, leaf chloroplast ultrastructure, and expression of genes involved in photosynthesis to elucidate the mechanisms through which Si mediated alleviation of manganese (Mn) toxicity in rice (Oryza sativa L.). Methods Rice seedlings were grown hydroponically with normal Mn (6.7 μM) or high Mn (2 mM) concentrations, both with (1.5 mM) and without Si supplementation. Leaf chloroplast ultrastructure was observed by scanning and transmission electron microscopy. Differentially expressed genes relating to photosynthesis were identified by highthroughput sequencing, and their relative expression levels were evaluated by real-time quantitative PCR. Results Chlorophyll and carotenoid concentrations and net photosynthesis decreased with chloroplast degradation under high Mn stress. High Mn concentrations may have inhibited photosynthesis through several mechanisms, including suppressing chlorophyll and ATP synthesis, decreasing light-harvesting processes, impairing photosystem I (PSI) stability and structure, and slowing activity of phosphoribulokinase. Si enhanced Mn tolerance efficiently by increasing chlorophyll concentration, light-use efficiency, and ATP concentration as well as by stabilizing the structure of PSI and promoting CO 2 assimilation. Conclusions Our findings suggest active involvement of Si in Mn detoxification, ranging from physiological responses to gene expression.

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“…Moreover, these nutrient elements also have unique functions and their balanced availability is essential for the metabolic systems of all living organisms (Soetan et al 2010;Tripathi et al 2015a). Silicon provided tolerance, to plants form abiotic and biotic stresses, as it gives mechanical strength to plant tissues (Sangster et al 2001;Tripathi et al 2012aTripathi et al , b, 2014Tripathi et al , 2015b. Rogalla and Röm-held (2002) have also been found that silicon is more effective against Mn toxicity in Cucumis sativus Linn.…”

Section: Resultsmentioning

confidence: 95%

Silicon bioavailability in exocarp of Cucumis sativus Linn.

et al. 2017

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Scanning electron microscopy (SEM) and electron probe micro-analyzer (EPMA) techniques have been used to detect the silicon bioavailability in the exocarp of warty cucumber surface. Warts appear at the time of anthesis and are remnant part of spines/trichomes which on further fruit maturation abscised from the exocarp. Results of EPMA and phytolith analysis clearly revealed that the surface of exocarp (fruit) of Cucumis sativus Linn. containing warts has greater quantity of silicon as compared to the other part of the fruit. Besides silicon, some other elements were also found, on the fruit exocarp and its surrounding area. The other elements are magnesium (Mg), aluminum (Al), phosphorus (P), sulfur (S), potassium (K), calcium (Ca), iron (Fe), nickel (Ni), copper (Cu), and sodium. The percentage of silica is highest followed by Ni, Ca, Al, P, Mg, Fe, S, Cu, K, and Cl. Thus, this study clearly demonstrates that Cucumis sativus Linn. fruits which are used as salads and appetizers on daily basis are loaded with silicon and other useful elements and possess numerous health benefits.

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Silicon-mediated alleviation of Cr(VI) toxicity in wheat seedlings as evidenced by chlorophyll florescence, laser induced breakdown spectroscopy and anatomical changes

Cited by 168 publications

References 53 publications

Silicon Nanoparticles More Efficiently Alleviate Arsenate Toxicity than Silicon in Maize Cultiver and Hybrid Differing in Arsenate Tolerance

Silicon Nanoparticles More Efficiently Alleviate Arsenate Toxicity than Silicon in Maize Cultiver and Hybrid Differing in Arsenate Tolerance

Silicon ameliorates manganese toxicity by regulating both physiological processes and expression of genes associated with photosynthesis in rice (Oryza sativa L.)

Silicon bioavailability in exocarp of Cucumis sativus Linn.

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