Faculty of Biology, University of Latvia
EEB
Hard copy: ISSN 1691–8088
On-line: ISSN 2255–9582
Environ Exp Biol (2022) 20: 193–204
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Environmental and
Experimental
Biology

Environ Exp Biol (2022) 20: 193–204

Orginal Paper

Exogenous application of salicylic acid mitigates salt stress in rice seedlings by regulating plant water status and preventing oxidative damage

Ravina Pai, Prabhat Kumar Sharma*
School of Biological Sciences and Biotechnology, Goa University, Taleigao Plateau, Goa 403 206, India
* Corresponding author, E-mail: pksharma@unigoa.ac.in

Abstract

Salicylic acid (SA) is a hormone participating in the acclimation of plants to biotic and abiotic stresses, including salinity. We investigated the possible underlying mechanism of mitigating salt stress by SA using NaCl-treated rice plants sprayed twice with exogenous SA at different concentrations. SA application resulted in increased growth, relative water content, proline accumulation, the quantum efficiency of photosynthesis and activity of superoxide dismutase in NaCl-treated plants. Application of SA decreased Na+ concentration and increased K+ concentration, thus increasing the K+/Na+ ratio. The application of SA mitigated the effect of NaCl by improving plant water status, ion homeostasis and decreased oxidative damage. Foliar application of 0.5 mM SA was more effective in mitigating the salt stress while 2 mM SA was inhibitory, and the second spray of SA showed no significantly enhanced ameliorating effect over the first spray.

Key words: membrane lipids, Oryza sativa, photosynthesis, reactive oxygen species, salicylic acid, salinity.

 
Environ Exp Biol (2022) 20: 193–204
 DOI: http://doi.org/10.22364/eeb.20.18
EEB

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Prof. Gederts Ievinsh
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University of Latvia

 
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