Salicylic Acid Improves Antioxidant Defense System and Photosynthetic Performance in Aristotelia chilensis Plants Subjected to Moderate Drought Stress

Salicylic acid (SA) has been shown to ameliorate drought stress. However, physiological and biochemical mechanisms involved in drought stress tolerance induced by SA in plants have not been well understood. Thus, this study aimed to study the role of SA application on enzymatic and non-enzymatic ant...

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Published in:Plants (Basel) 2022-02, Vol.11 (5), p.639
Main Authors: González-Villagra, Jorge, Reyes-Díaz, Marjorie M, Tighe-Neira, Ricardo, Inostroza-Blancheteau, Claudio, Escobar, Ana Luengo, Bravo, León A
Format: Article
Language:English
Subjects:
Antioxidants
ascorbate peroxidase activity
CO2 assimilation
Drought
Enzymes
Experiments
Field capacity
Lipid peroxidation
Lipids
Metabolism
Morphology
Oxidative stress
Phenolic compounds
Phenols
Photosynthesis
Physiology
Plant growth
Salicylic acid
superoxide dismutase activity
total phenolics
Water potential
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Summary:Salicylic acid (SA) has been shown to ameliorate drought stress. However, physiological and biochemical mechanisms involved in drought stress tolerance induced by SA in plants have not been well understood. Thus, this study aimed to study the role of SA application on enzymatic and non-enzymatic antioxidants, photosynthetic performance, and plant growth in plants subjected to moderate drought stress. One-year-old plants were subjected to 100% and 60% of field capacity. When plants reached moderate drought stress (average of stem water potential of -1.0 MPa, considered as moderate drought stress), a single SA application was performed on plants. Then, physiological and biochemical features were determined at different times during 14 days. Our study showed that SA application increased 13.5% plant growth and recovered 41.9% and 40.7% in drought-stressed plants on day 3 compared to drought-stressed plants without SA application. Interestingly, SOD and APX activities were increased 85% and 60%, respectively, in drought-stressed SA-treated plants on day 3. Likewise, SA improved 30% total phenolic content and 60% antioxidant capacity in drought-stressed plants. Our study provides insight into the SA mechanism to tolerate moderate drought stress in plants.
ISSN:2223-7747
2223-7747
DOI:10.3390/plants11050639