Silicon nutrition potentiates the antioxidant metabolism of rice plants under iron toxicity

• Autorzy: Chalmardi Z.K. , Abdolzadeh A. , Sadeghipour H. R.
• Języki publikacji: EN

Abstrakty

EN

Iron toxicity reduces growth of rice plants in acidic lowlands. Silicon nutrition may alleviate many stresses including heavy metal toxicity in plants. In the present study, the ameliorating effects of silicon nutrition on rice (Oryza sativa L.) plants under toxic Fe levels were investigated. Plants were cultivated in greenhouse in hydroponics under different Fe treatments including 10, 50, 100, and 250 mg L⁻¹ as Fe-EDTA and silicon nutrition including 0 and 1.5 mM sodium silicate. Iron toxicity imposed significant reduction in plant fresh weight, tiller, and leaf number. The activity of catalase, cell wall, and soluble peroxidases, and polyphenol oxidase in shoots decreased due to moderate Fe toxicity (50 and 100 mg L⁻¹), but increased at greater Fe concentration. Ascorbate peroxidase activity increased in both roots and shoots of Fe-stressed plants. Iron toxicity led to increased tissue hydrogen peroxide and lipid peroxidation. Silicon nutrition improved plant growth under all Fe treatments and alleviated Fe toxicity symptoms, probably due to lower Fe concentration of Si-treated plants. Silicon application could improve the activity of antioxidant enzymes such as catalase, ascorbate peroxidase, and soluble peroxidase under moderate Fe toxicity, which resulted in greater hydrogen peroxide detoxification and declined lipid peroxidation. Thus, silicon nutrition could ameliorate harmful effects of Fe toxicity possibly through reduction of plant Fe concentration and improvement of antioxidant enzyme activity.

• Wydawca: -
• Czasopismo: Acta Physiologiae Plantarum
• Rocznik: 2014
• Tom: 36
• Numer: 02
• Opis fizyczny: p.493-502,fig.,ref.

Twórcy

autor

Chalmardi Z.K.

• Department of Biology, Faculty of Science, Golestan University, PO Box: 155, Gorgan, 49138-15759, Iran

autor

Abdolzadeh A.

• Department of Biology, Faculty of Science, Golestan University, PO Box: 155, Gorgan, 49138-15759, Iran

autor

Sadeghipour H. R.

• Department of Biology, Faculty of Science, Golestan University, PO Box: 155, Gorgan, 49138-15759, Iran

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Identyfikatory

DOI

10.1007/s11738-013-1430-7