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Corn silk contained high polyphenol components with strong free radical scavenging activity. Although Silicon (Si) has not been considered as an essential element for growth and development of higher plants, it has been proved to be beneficial for the healthy growth and development of many plant species, and plants usually deposited this element in their cell walls. Boron (B) toxicity is an important disorder that can limit plant growth on soils of arid and semiarid environments throughout the world. High concentrations of boron may occur naturally in the soil or in the ground water, or be added to the soil from mining, fertilizers and irrigation water. In this research, role of Si in change of total polyphenol content and antioxidant activity of extracts of corn silk investigated under boron toxicity. The experiment was arranged as a factorial scheme based on completely randomized design (CRD) with three replications in greenhouse condition. Three levels of B (0.5, 2, 4 mg L-1) from H3BO3 and three levels of Si (0, 28, 56 mg L-1) from Na2SiO3 were added to nutrient solution. Results of the present study indicated that the highest levels of total polyphenol content and antioxidant activity observed in treatments of B (0.5 mg L-1) + Si (28 mg L-1) and B (0.5 mg L-1) + Si (56 mg L-1), respectively. Based on the present work, it can be concluded that Si alleviates B toxicity by enhancement of polyphenolic contents and antioxidant activity of corn silk extracts. In conclusion, Si can improve B toxicity in maize plant.
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