The Role of Salicylic Acid in Mitigating the Adverse Effects of Chilling Stress on “Seddik” Mango Transplants
2022
Ibrahim Hmmam | Amr E. M. Ali | Samir M. Saleh | Nagwa Khedr | Abdou Abdellatif
Salicylic acid (SA) was sprayed on &ldquo:Seddik&rdquo: mango transplants at concentrations of 0, 0.5, 1, and 1.5 mM. Then, the mango transplants were subjected to 72 h of chilling stress at 4 ±: 1 °:C, followed by a six-day recovery under greenhouse conditions. Untreated transplants exposed to chilling stress represented the positive control, while those not exposed were the negative control. SA-pretreated mango transplants were compared to the positive and negative controls, evaluating physiological and biochemical changes. The SA concentration of 1.5 mM L&minus:1 was the most efficient in mitigating chilling injury (CI) in mango transplants by maintaining the integrity of the leaves&rsquo: cell membrane and minimizing electrolyte leakage (EL), specifically after six days of recovery. SA increased photosynthetic pigment content, total sugar content, and 2, 2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity and decreased proline and total phenolic content in the &ldquo:Seddik&rdquo: mango transplants&rsquo: leaves. After exposure to chilling stress, the antioxidant enzymes&rsquo: internal activities in SA-pretreated chilled mango transplants improved, especially on the sixth day of recovery, compared to the negative control: the transplants nearly attained normal growth levels. Thus, SA can protect plants against the adverse effects of chilling stress.
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