The effects of selenium and other micronutrients on the antioxidant activities and yield of corn (Zea mays L.) under drought stress

Silicon (Si) has an important function in reducing the damage of environmental stress on plants. Acid rain is a serious abiotic stress factor, and Si can alleviate the stress induced by acid rain on plants. Based on these assumptions, we investigated the effects of silicon on the growth, root phenotype, mineral element contents, hydrogen peroxide (H2O2) and antioxidative enzymes of rice (Oryza sativa L.) seedling roots under simulated acid rain (SAR) stress. The results showed that the combined or single effects of Si and/or SAR on rice roots depend on the concentration of Si and the pH of the SAR. The combined or single effects of a low or moderate concentration of Si (1.0 or 2.0 mM) and light SAR (pH 4.0) enhanced the growth of rice roots, and the combined effects were stronger than those of the single treatment. A high concentration of Si (4.0 mM) or severe SAR (pH 2.0) exerted deleterious effects. The incorporation of Si (1.0, 2.0 or 4.0 mM) into SAR with pH 3.0 or 2.0 promoted the rice root growth, decreased the H2O2 content, increased the Si concentration and the superoxide dismutase (SOD), catalase (CAT), peroxidase (POD) and ascorbate peroxidase (APX) activities, maintained the balance of mineral element (K, Ca, Mg, Fe, Zn, and Cu) concentrations in the roots of rice seedlings compared with SAR alone. The alleviatory effects observed with a moderate concentration of Si (2.0 mM) were better than the effects obtained with a low or high concentration of Si (1.0 or 4.0 mM). The observed effects were due to disruptions in the absorption and utilization of mineral nutrients and impacts on the activity of antioxidant enzymes in roots, and this conclusion suggests that the degree of rice root damage caused by acid rain might be attributed to not only acid rain but also the level of Si in the soil.

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“…The homogenates were centrifuged at 15,000×g and 4°C for 20 min, and the supernatants were used for assaying enzyme activity [53]. …”

Section: Methodsmentioning

confidence: 99%

Effects of silicon on Oryza sativa L. seedling roots under simulated acid rain stress

Yin

Wang

et al. 2017

PLoS ONE

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“…Foliarly-applied Se also increased the respiratory potential in young chicory plants [14]. Addition of Se significantly enhanced the antioxidant activity, antioxidant level and maize grain yield when drought stress level was increased [36].…”

Section: Discussionmentioning

confidence: 89%

Sunflower seedlings hyperaccumulate Selenium

Garousi

Kovács

Veres

2018

Acta Biologica Hungarica

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Selenium (Se) is an essential element for animals and humans, but not plants. However, the capacity of some plants to accumulate and transform Se into bioactive compounds has important implications for human nutrition and health. In this study, sunflower (Helianthus annuus) and maize (Zea mays) seedlings were cultivated in soil to investigate the effect of different rates of sodium selenite (1-90 mg kg soil) and sodium selenate (1-30 mg kg soil) on absorption and translocation of Se and sulphur (S). Sodium selenate decreased growth of sunflower roots at all applied rates and of maize roots at the highest rate applied. In contrast, sodium selenite up to 30 mg kg for sunflower and 3 mg kg for maize resulted in increased shoot and root growth. An increase in Se concentration in soil resulted in an increase in Se and a decrease in S accumulation in roots and shoots of both maize and sunflower. Selenium translocation from roots to shoot was higher in sunflower than maize. Root-to-shoot translocation of Se was 5 to 30 times greater in sunflower and 0.4 to 3 times greater in maize in the sodium selenate than sodium selenite treatments. Sunflower, as a Se-hyperaccumulator with up to 1.8 g kg in shoots (with no significant decrease in shoot biomass) can be a valuable plant in biofortification to improve animal/human nutrition, as well as in phytoremediation of contaminated sites to restore ecosystem services.

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“…The method of the DPPH free radical, a stable organic free radical, is widely used for a rapid evaluation of the antioxidant activity of specific compounds or extracts. Sajedi et al . reported that the application of Se significantly increased the antioxidant activity and yield of maize, whereas Chu et al .…”

Section: Discussionmentioning

confidence: 99%

“…NS, no significant difference at P < 0.05. specific compounds or extracts. Sajedi et al 28 reported that the application of Se significantly increased the antioxidant activity and yield of maize, whereas Chu et al 12 found that the H 2 O 2 concentration was significantly reduced with spraying of Se at the later stage of wheat growth, although no difference was observed with spraying of Se at the early stage of wheat growth. In the present study, spraying foliar selenate or selenite showed no significant effect on the DPPH free radical scavenging rate of the two blueberry cultivars.…”

Section: Effects Of Se Spray On Conventional Quality and Storage Of Bmentioning

confidence: 99%

Effects of a foliar spray of selenite or selenate at different growth stages on selenium distribution and quality of blueberries

Zhao

Zhou

et al. 2018

J Sci Food Agric

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The effects of selenium and other micronutrients on the antioxidant activities and yield of corn (Zea mays L.) under drought stress

Cited by 73 publications

References 28 publications

Effects of silicon on Oryza sativa L. seedling roots under simulated acid rain stress

Effects of silicon on Oryza sativa L. seedling roots under simulated acid rain stress

Sunflower seedlings hyperaccumulate Selenium

Effects of a foliar spray of selenite or selenate at different growth stages on selenium distribution and quality of blueberries

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