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Photosynthetica

, Volume 56, Issue 4, pp 1047–1057 | Cite as

Silicon nutrition mitigates salinity stress in maize by modulating ion accumulation, photosynthesis, and antioxidants

  • W. U. D. Khan
  • T. Aziz
  • M. A. Maqsood
  • M. Farooq
  • Y. Abdullah
  • P. M. A. Ramzani
  • H. M. Bilal
Original paper
  • 58 Downloads

Abstract

Silicon is known to improve resistance against salinity stress in maize crop. This study was conducted to evaluate the influence of silicon application on growth and salt resistance in maize. Seeds of two maize genotypes (salt-sensitive ‘EV 1089’ and salt-tolerant ‘Syngenta 8441’) were grown in pots containing 0 and 2 mM Si with and without 50 mM NaCl. After detailed investigation of ion concentrations in different maize organs, both genotypes were further selected in hydroponic experiment on basis of their contrasting response to salinity stress. In the second experiment, pre-germinated seedlings were transplanted into nutrient solution with 0 and 60 mM NaCl with and without 2 mM Si. Both genotypes differed significantly in their response to salinity. Silicon addition alleviated both osmotic and oxidative stress in maize crop by improving the performance of defensive machinery under salinity stress. Silicon application also improved the water-use efficiency in both tested genotypes under both normal and salinity stress conditions. In conclusion, this study implies that the silicon-treated maize plants had better chance to survive under salinity conditions and their photosynthetic and biochemical apparatus was working far better than that of silicon-non-treated plants.

Additional key words

chlorophyll photosynthetic rate total phenolics 

Abbreviations

APX

ascorbate peroxidase

BSA

bovine serum albumin

Chl

chlorophyll

CAT

catalase

E

transpiration rate

gs

stomatal conductance

NBT

nitroblue tetrazolium

PN

photosynthetic rate

SOD

superoxide dismutase

WUE

water-use efficiency

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Copyright information

© The Institute of Experimental Botany 2018

Authors and Affiliations

  • W. U. D. Khan
    • 1
  • T. Aziz
    • 2
  • M. A. Maqsood
    • 2
  • M. Farooq
    • 3
  • Y. Abdullah
    • 1
  • P. M. A. Ramzani
    • 4
  • H. M. Bilal
    • 2
  1. 1.Sustainable Development Study CentreGovernment College UniversityLahorePakistan
  2. 2.Institute of Soil and Environmental SciencesUniversity of AgricultureFaisalabadPakistan
  3. 3.Department of AgronomyUniversity of AgricultureFaisalabadPakistan
  4. 4.Cholistan Institute of Desert StudiesThe Islamia University of BahawalpurBahawalpurPakistan

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