Citric Acid Reduces Alkaline Stress-induced Chlorosis, Oxidative Stress, and Photosynthetic Disturbance by Regulating Growth Performance, Antioxidant Activity and ROS Scavenging in Alfalfa
2021
Lee, K.W. | Lee, S.H. | Song, Y.W. | Park, H.S. | Woo, J.H. | Choi, B.R. | Lim, E.A. | Rahman, M.A.
Pollution of agricultural soil by alkaline salts, such as Na₂CO₃, is a critical and long-lasting problem in cultivable land. The aim of the study was to examine the putative role of citric acid (CA) in alleviating Na₂CO₃-stress in alfalfa. In this study, Na₂CO₃ significantly induced leaf chlorosis, inhibited plant growth and photosynthesis related parameters, increased hydrogen peroxide (H₂O₂) and reduced major antioxidant enzymes (SOD ,CAD, APX) in alfalfa. However, the presence of CA these negative effects of Na₂CO₃-stress largely recovered. Interestingly, expression of antioxidant and ion transporter genes (Fe-SOD, CAT, APX, DHAR and NHX1) involved in Reactive oxygen species (ROS) homeostasis and oxidative stress tolerance in alfalfa. These findings suggest that CA-mediated Na₂CO₃ stress alleviation is an ecofriendly approach that would be useful to local farmer for alfalfa and other forage crop cultivation in alkaline soils.
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