Response of silicon on metal accumulation, photosynthetic inhibition and oxidative stress in chromium-induced mustard (Brassica juncea L.)

Ashfaque, Farha; Inam, Arif; Iqbal, Saba; Sahay, Seema

doi:10.1016/j.sajb.2017.03.002

Cited by 86 publications

(33 citation statements)

References 51 publications

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“…Previous studies considered the Si as a growth regulator-like compound that enhanced the cell division and extension in rice plants (Kabir et al 2016), and has a defensive role against many biotic and abiotic stresses (Tripathi et al 2013). Application of Si has been reported to improve the growth and leaf P n in different crops including mustard (Ashfaque et al 2017), alfalfa (Kabir et al 2016), and maize (Dresler et al 2015). Wahid et al (2009) reported that alleviation of oxidative damage may enhance the synthesis and accumulation of chlorophyll pigments.…”

Section: Discussionmentioning

confidence: 99%

Physiological and Biochemical Bases of Foliar Silicon-Induced Alleviation of Cadmium Toxicity in Wheat

Thind

Hussain

Ali

et al. 2020

J Soil Sci Plant Nutr

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Silicon (Si) is a beneficial nutrient for crop plants, and is gaining increased attention because of its involvement in regulation of abiotic stress tolerance. The present study was carried out to explore the underlying physiological and biochemical mechanisms of foliar Si-induced enhancement in wheat tolerance against cadmium (Cd) stress. Surface sterilized seeds of two wheat cultivars, viz., Inqalab-91 (sensitive) and Sahar-2006 (tolerant), were sown in plastic pots. Foliar application of Si (3 mM) was done at 20 days after sowing under control (−Cd) and Cd stress (25 mg kg −1 soil) conditions. Plants were harvested after 3 weeks of foliar spray, and data regarding morphological growth, oxidative metabolism, photosynthetic pigments, gas exchange attributes, metabolite accumulation, and ion homeostasis were recorded. The experimental treatments were arranged in completely randomized design with four replicates per treatment. Cadmium stress was found to significantly decrease the morphological growth, photosynthesis, and photosynthetic pigments in both wheat cultivars, while significantly increased malondialdehyde (MDA) content, hydrogen peroxide (H 2 O 2) content, and electrolyte leakage (EL) that triggered oxidative stress. The Cdinduced changes in superoxide dismutase (SOD), peroxidase (POD), catalase (CAT), ascorbate peroxidase (APX), glutathione S-transferase (GST), and glutathione reductase (GR) activities varied with cultivar and Si application. Plants treated with Si revealed better growth, higher accumulation of total soluble proteins, anthocyanins, total soluble sugar, flavonoids, and phenolics contents, and efficient antioxidant defense system as indicated by increased ascorbic acid and glutathione pools, and higher activities of SOD, POD, CAT, and APX particularly under Cd stress. Application of Si reduced Cd-mediated oxidative stress and increased photosynthetic pigments and net photosynthetic rate in both wheat cultivars. Further, Si application enhanced mineral ions in normal (−Cd) and Cd-stressed plants, and significantly decreased the Cd uptake. The Si-induced effects were more prominent in Sahar-2006 than that in Inqalab-91 for most of the studied traits, particularly under stress conditions. In short, foliar application of Si alleviates the adverse effects of Cd on wheat growth by strengthening antioxidant defense system, enhancing metabolite accumulation, improving plant nutrient status, and decreasing the Cd uptake.

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Section: Discussionmentioning

confidence: 99%

Physiological and Biochemical Bases of Foliar Silicon-Induced Alleviation of Cadmium Toxicity in Wheat

Thind

Hussain

Ali

et al. 2020

J Soil Sci Plant Nutr

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“…However, we did not evaluate in detail any structural, physiological, or molecular changes in hydroponic basil plants exposed to elevated levels of Si nutrition. We suspect that the likely mechanism had less involvement in any physical enhancements of the plant tissue resulting from Si deposition; however, we suppose that it is similar to what occurs in other Si microaccumulators such as brassica species (Ashfaque et al, 2017;Pandey et al, 2016) and salvia (Soundararajan et al, 2014). In these species, Si-regulated stress responses occur at the physiological and molecular levels and include changes in the antioxidant system (Adrees et al, 2015;Gu et al, 2011), gas exchange, osmotic adjustments, compatible solute distribution (Debona et al, 2017;Shi et al, 2016), and stress-related phytohormone synthesis (Etesami and Jeong, 2018).…”

Section: Resultsmentioning

confidence: 73%

Potential Benefits of Silicon Nutrition to Hydroponically Grown Sweet Basil

Li¹,

Heckman²,

Wyenandt³

et al. 2020

horts

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Sweet basil (Ocimum basilicum L.) is a globally cultivated and consumed herb known for its unique aroma and flavor. Sweet basil grows best in warm temperatures, and productivity and marketability decrease when grown under cool conditions (<10 °C). Silicon (Si) is not considered an essential plant nutrient, but it can be beneficial to Si macroaccumulator plants by alleviating several biotic and abiotic stresses. Recent studies have shown that some microaccumulator species may also benefit from Si. In this study, we examined the effects of different levels (0, 25, and 75 ppm Si) of Si amendments on hydroponic basil grown at 23 °C. Si (75 ppm) significantly increased shoot height and weight with no negative impact on plant morphology. All Si-treated basil plants absorbed Si in small quantities and affected the uptake of phosphorus, magnesium, sulfur, iron, manganese, copper, zinc and molybdenum. After an unintentional frost event, basil plants treated with 75 ppm had significantly higher survival rates and reduced cold injury symptoms. We concluded that Si amendments can have a positive impact on hydroponically grown sweet basil, and that such amendments may reduce plant damage due to occasionally cooler growing temperatures.

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“…Sequel plants [ 65 ]. There is also a possibility that the enhanced growth and nodulation in Si treated plants could be as a consequence of the Si promotion of net photosynthesis and chlorophyll content [ 66 ], as well as the cytokinin [ 67 ], K and Ca levels [ 63 ] (the parameters not investigated in current study). Nevertheless, the enhanced growth and nodulation detected in all Si treated healthy plants was far below than that elicited by the combined additions of Si + N. For all healthy plants, this observation seems to be the result of combined synergism of the N added and N from ureides for growth, as well as the enzymatic synthesis of nitric oxide from NO 3 − in the roots and nodules [ 59 , 68 , 69 ].…”

Section: Discussionmentioning

confidence: 99%

Silicon and Nitrate Differentially Modulate the Symbiotic Performances of Healthy and Virus-Infected Bradyrhizobium-nodulated Cowpea (Vigna unguiculata), Yardlong Bean (V. unguiculata subsp. sesquipedalis) and Mung Bean (V. radiata)

Izaguirre‐Mayoral

Brito

Baral

et al. 2017

Plants

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The effects of 2 mM silicon (Si) and 10 mM KNO3 (N)—prime signals for plant resistance to pathogens—were analyzed in healthy and Cowpea chlorotic mottle virus (CCMV) or Cowpea mild mottle virus (CMMV)-infected Bradyrhizobium-nodulated cowpea, yardlong bean and mung bean plants. In healthy plants of the three Vigna taxa, nodulation and growth were promoted in the order of Si + N > N > Si > controls. In the case of healthy cowpea and yardlong bean, the addition of Si and N decreased ureide and α-amino acids (AA) contents in the nodules and leaves in the order of Si + N> N > Si > controls. On the other hand, the addition of N arrested the deleterious effects of CCMV or CMMV infections on growth and nodulation in the three Vigna taxa. However, the addition of Si or Si + N hindered growth and nodulation in the CCMV- or CMMV-infected cowpea and yardlong bean, causing a massive accumulation of ureides in the leaves and nodules. Nevertheless, the AA content in leaves and nodules of CCMV- or CMMV-infected cowpea and yardlong bean was promoted by Si but reduced to minimum by Si + N. These results contrasted to the counteracting effects of Si or Si + N in the CCMV- and CMMV-infected mung bean via enhanced growth, nodulation and levels of ureide and AA in the leaves and nodules. Together, these observations suggest the fertilization with Si + N exclusively in virus-free cowpea and yardlong bean crops. However, Si + N fertilization must be encouraged in virus-endangered mung bean crops to enhance growth, nodulation and N-metabolism. It is noteworthy to see the enhanced nodulation of the three Vigna taxa in the presence of 10 mM KNO3.

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Response of silicon on metal accumulation, photosynthetic inhibition and oxidative stress in chromium-induced mustard (Brassica juncea L.)

Cited by 86 publications

References 51 publications

Physiological and Biochemical Bases of Foliar Silicon-Induced Alleviation of Cadmium Toxicity in Wheat

Physiological and Biochemical Bases of Foliar Silicon-Induced Alleviation of Cadmium Toxicity in Wheat

Potential Benefits of Silicon Nutrition to Hydroponically Grown Sweet Basil

Silicon and Nitrate Differentially Modulate the Symbiotic Performances of Healthy and Virus-Infected Bradyrhizobium-nodulated Cowpea (Vigna unguiculata), Yardlong Bean (V. unguiculata subsp. sesquipedalis) and Mung Bean (V. radiata)

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