Comparative Effect of Salinity on Antioxidant Enzymes of Two Wheat Genotypes by Foliar Application of Salicylic Acid and Potassium

Farzana Shaheen,Allah Bakhsh Gulshan,Yongjun Yang,Mona S Alwahibi,Fu Chen,Mudasra Munir,Muhammad Yasin Ashraf,Jing Ma,Jawaher Alkahtani,Humayun Bashir,Sonaina Nazar,Kafeel Ahmed,Zafar Iqbal Khan,Muhammad Nadeem

doi:10.37358/rc.20.9.8317

Abstract

The aim of this work was to examine the ameliorative effect of foliar application of salicylic acid and potassium on antioxidant enzymes activity in wheat under saline conditions. Two wheat genotypes WL-711 (salt tolerant) and Kohistan-97 (salt sensitive) were used with salicylic acid (SA) and potassium (K+) foliar spray which were applied at both vegetative and grain filling stage under saline conditions. Various enzymatic antioxidant activities include catalase (CAT), peroxidase (POD), superoxide dismutase (SOD) and ascorbate peroxidase (APX) was assesed. Result cleared that foliar spray of salicylic acid and potassium decreased the damaged effect of salinity in both wheat genotypes especially Kohistan-97 which was more salt sensitive. Overall, foliarly applied salicylic acid and potassium reduces the adverse effects of reactive oxygen species and antioxidant enzymes on cellular metabolism that was disturbed by salt stress.

Highlights

Salt stress is one of the main threats for agriculture productivity worldwide
Plants grown under salt stressed showed highest value for superoxide dismutase (SOD) (200.68 Units min-1 g-1 FW) than those under non saline conditions (160.85 Units min-1 g-1 FW)
Overall results showed that foliar spray of K+ and salicylic acid (SA) at grain filling stage was fruitful in SOD activity in plants under saline condition

Summary

Introduction

Salt stress is one of the main threats for agriculture productivity worldwide. In this situation, salinity tolerance of crop plant for future food supply is required for sufficient food supply to growing population. Oxidative stress is the amalgamation of osmotic stress, ionic stress and salt stress Another type of stress is release of reactive oxygen species mainly produced in chloroplasts and mitochondria which includes hydrogen peroxide, superoxide anion and hydroxyl radicals [5-7]. These react with high oxygen level after capturing electrons from electron transport chain and modify the function of very sensitive organelle chloroplast where photosynthesis takes place. There occur two defense systems used against the repair damage induced by oxidizing agents by plants

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