Silicon Improves the Production of High Antioxidant or Structural Phenolic Compounds in Barley Cultivars under Aluminum Stress
by
Isis Vega 1,2, Miroslav Nikolic 3, Sofía Pontigo 2, Karina Godoy 2, María de La Luz Mora 2,4
and Paula Cartes 2,4,*
Isis Vega 1,2, Miroslav Nikolic 3, Sofía Pontigo 2, Karina Godoy 2, María de La Luz Mora 2,4 and Paula Cartes 2,4,*
1
Doctoral Program in Science of Natural Resources, Universidad de La Frontera, Avenida Francisco Salazar 01145, P.O. Box 54-D, Temuco 4780000, Chile
2
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 4780000, Chile
3
Plant Nutrition Research Group, Institute for Multidisciplinary Research, University of Belgrade, PO Box 33, Belgrade 11030, Serbia
4
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 4780000, Chile
*
Author to whom correspondence should be addressed.
Agronomy 2019, 9(7), 388; https://doi.org/10.3390/agronomy9070388
Received: 9 May 2019 / Revised: 2 July 2019 / Accepted: 10 July 2019 / Published: 17 July 2019
(This article belongs to the Special Issue Nutrition Management of Hydroponic Vegetable Crops)
Aluminum (Al) toxicity is one of the main growth and yield limiting factors for barley grown on acid soils. Silicon (Si) ameliorates Al toxicity as well as it promotes the phenolic compounds production that have antioxidant or structural role. We evaluated the time-dependent kinetics of Al and Si uptake and the impact of Si on the production of antioxidant- or structural- phenols in barley cultivars at the short-term. Two barley cultivars with contrasting Al tolerance (Hordeum vulgare ‘Sebastian’, Al tolerant; and H. vulgare ‘Scarlett’, Al sensitive), exposed to either −Al (0 mM) or +Al (0.2 mM) nutrient solutions without Si (−Si) or with 2 mM (+Si) were cultured for 48 h. Aluminum and Si concentration decreased in plants at all harvest times when Al and Si were simultaneously supplied; this effect was more noticeable in ‘Scarlett’. Nevertheless, Si influenced the antioxidant system of barley irrespective of the Al tolerance of the cultivar, decreasing oxidative damage and enhancing radical scavenging activity, the production of phenolic compounds, and lignin accumulation in barley with short-term exposure to Al.
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Keywords:
aluminum toxicity; barley; phenolic compounds; lignin
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MDPI and ACS Style
Vega, I.; Nikolic, M.; Pontigo, S.; Godoy, K.; Mora, M.L.L.; Cartes, P. Silicon Improves the Production of High Antioxidant or Structural Phenolic Compounds in Barley Cultivars under Aluminum Stress. Agronomy 2019, 9, 388.
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