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RESEARCH ARTICLE

Sodium silicate and calcium silicate differentially affect silicon and aluminium uptake, antioxidant performance and phenolics metabolism of ryegrass in an acid Andisol

Alejandra Ribera-Fonseca A D , Cornelia Rumpel B E , María de la Luz Mora A F , Miroslav Nikolic C and Paula Cartes A F G
+ Author Affiliations
- Author Affiliations

A Center of Plant–Soil Interaction and Natural Resources Biotechnology, Scientific and Technological Bioresource Nucleus (BIOREN-UFRO), Universidad de La Frontera, Avenida Francisco Salazar 01145, PO Box 54-D, Temuco, Chile.

B CNRS, IEES (UMR 7618, UPMC-CNRS-INRA-IRD-UPEC), Bâtiment EGER, Aile B, 78850 Thiverval-Grignon, France.

C Plant Nutrition Research Group, Institute for Multidisciplinary Research, University of Belgrade, PO Box 33, Belgrade, Serbia.

D Departamento de Producción Agropecuaria, Facultad de Ciencias Agropecuarias y Forestales, Universidad de La Frontera, Avenida Francisco Salazar 01145, PO Box 54-D, Temuco, Chile.

E CNRS, Ecosys (UMR INRA-AgroParisTech), Bâtiment EGER,Aile B, 78850 Thiverval-Grignon, France.

F Departamento de Ciencias Químicas y Recursos Naturales, Facultad de Ingeniería y Ciencias, Universidad de La Frontera, Avenida Francisco Salazar 01145, PO Box 54-D, Temuco, Chile.

G Corresponding author. Email: paula.cartes@ufrontera.cl

Crop and Pasture Science 69(2) 205-215 https://doi.org/10.1071/CP17202
Submitted: 2 June 2017  Accepted: 21 November 2017   Published: 2 February 2018

Abstract

Evidence indicates that silicon (Si) alleviates diverse stresses by improving the antioxidant capacity and phenolics metabolism of plants. We assessed the effect of sodium silicate (Na2SiO3) and calcium silicate (CaSiO3) on Si and aluminium (Al) uptake, antioxidant performance and phenolics (with antioxidant or structural function) of ryegrass cultivated on an acid Andisol under greenhouse conditions. Ryegrass was treated with either sodium silicate or calcium silicate at gradually increasing doses (250, 500 and 1000 mg Si kg–1 soil). Yield and concentrations of Si and Al were measured in roots and two shoot cuts. At the first cut, phenols, antioxidant enzymes, antioxidant capacity, lipid peroxidation and lignin production and composition were also determined. Ryegrass supplied with sodium silicate exhibited the highest Si content. Root Si was closely correlated with Al or Si : Al ratio. Shoot Si uptake increased total phenols and activities of antioxidant enzymes (CAT, APX and POD), but reduced lipid peroxidation. Silicon also changed the lignin production and composition in shoots at the highest sodium silicate dose. Silicon uptake reduced the deleterious effect of soil acidity in ryegrass. Sodium silicate had the greatest influence on the antioxidant system through enhancement of phenols production and antioxidant enzyme activation. Peroxidase activity appears to be associated with increased lignin biosynthesis in plants supplied with sodium silicate.

Additional keywords: acid soils, lignin, phenolic compounds, plant nutrition.


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