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Silicon Fertilization Improves Physiological Responses in Sugarcane Cultivars Grown Under Water Deficit

  • M. S. de CamargoEmail author
  • B. K. L. Bezerra
  • L. A. Holanda
  • A. L. Oliveira
  • A. C. Vitti
  • M. A. Silva
Research Article

Abstract

There are few results about association Si and water deficit in sugarcane plants, regarding physiological aspects. The objective of this study was to investigate the effects of Si fertilization and water deficit imposed during two seasons on sugarcane cultivars using physiological evaluations, biomass measurements, and determination of the Si content in the plants and soil. Two experiments were conducted in a randomized block design: four sugarcane cultivars (drought-tolerant: RB86-7515 and SP83-2847; drought-sensitive: RB85-5536 and RB85-5453), two levels of Si (0 and 600 kg ha−1 Si), and with and without water deficit during spring (October 2014) or winter (July 2015). Si fertilization increased soluble Si in the soil in both experiments. Si provided increases in relative water content (RWC) for RB85-5536 and SP83-2847, in carotenoids content for RB85-5453 and SP83-2847, and dry weight (DW), water potential (Ψw), and SPAD for RB86-7515 during spring under drought. During winter, Si improved RWC, Ψw, DW, and Si uptake and decreased electrolyte leakage in leaves. In conclusion, Si can be considered a feasible alternative to alleviate water deficit damage imposed in both studied seasons through different physiological alterations according to each cultivar.

Keywords

Silicate Plant nutrition Drought Soil 

Notes

Acknowledgments

The authors would like to thank the São Paulo State Research Foundation (FAPESP) for financial support of research project 2013/04144-7 for a fellow scholarship for a graduate student (second author). The authors would also like to thank the Federal University of Sao Carlos (UFSCAR/CCA) for providing stalks of sugarcane cultivars. The last author acknowledges the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq, Brazil) for the “Productivity in Research” fellowship (Proc. 310416/2015-9).

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Copyright information

© Sociedad Chilena de la Ciencia del Suelo 2019

Authors and Affiliations

  • M. S. de Camargo
    • 1
    Email author
  • B. K. L. Bezerra
    • 2
  • L. A. Holanda
    • 2
  • A. L. Oliveira
    • 3
  • A. C. Vitti
    • 1
  • M. A. Silva
    • 2
  1. 1.Pólo Centro SulAgência Paulista de Tecnologia dos Agronegócios (APTA)PiracicabaBrazil
  2. 2.Departamento de Produção e Melhoramento Vegetal, Faculdade de Ciências AgráriasUniversidade do Estado de São Paulo (UNESP)BotucatuBrazil
  3. 3.Centro de Ciências AgráriasUniversidade Federal de São CarlosArarasBrazil

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