Journal
PLANT PHYSIOLOGY AND BIOCHEMISTRY
Volume 123, Issue -, Pages 268-280Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.plaphy.2017.12.023
Keywords
Selenium; Ion toxicity; NaCl salinity; Maize; Antioxidant defense system; Different growth stages
Categories
Funding
- Higher Education Commission of Pakistan [21-188/SRGP/RD/HEC/2014]
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The underlying mechanism of selenium (Se) mediating plant salt tolerance is not well understood and information on how plant growth and development is regulated by phenological Se application (20 and 40 mg/L) under salinity stress is scarce. In present study, we have appraised the impact of phenological Se application on growth, antioxidant defense system and ionic imbalance in maize under salinity. Salinity (12 dS m(-1)) reduced growth, concentration of chlorophyll and K+ in root and leaf. Contrarily, salinity increased toxic Na+, malondialdehyde (MDA) and H2O2 concentration that resulted in oxidative damage. Lower level of Se application (20 mg/L) increased growth and chlorophyll by reducing oxidative damage due to high cell concentrations of MDA and H2O2. Se reduced endogenous levels of H2O2 and MDA under salinity. Moreover, Se regulated antioxidant defense system by increasing the activities of antioxidant enzymes (SOD, POD and CAT) and influenced the concentrations of non-enzymatic antioxidants (phenolics and flavonoids). Se-induced better antioxidant system protected plants from oxidative damage. We have also recorded substantial increase in K+ and decrease in Na+ concentration in plants treated with 20 mg/L Se under salinity stress. The impact of Se on plant growth and development is linked with the growth stage of exogenous application. Foliar Se at reproductive and both vegetative and reproductive stages improved salinity tolerance in maize compared with vegetative stage.
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