Mango belongs to the family Anacardiaceae and the genus Mango. It prefers warmth and is one of the five tropical fruits in the world. China is a major producer of mangoes in the world, and in recent years, the planting area of mangoes has gradually expanded. Due to poor management, the number and variety of mango diseases and pests have been increasing, causing serious losses to mango production. Leaf blight is a common fungal disease in mango fruit production. In order to study the changes in relevant resistance indexes after the infection by Alternaria tenuissima and the resistance induction mechanism of salicylic acid on mango leaf blight, and to provide a reference for the prevention and control of mango leaf blight in mango fruit production. In this study, salicylic acid solution was sprayed on the leaves of mango seedlings, and purified Alternaria tenuissima was inoculated into healthy seedlings through the wound. The seedlings infected with leaf blight pathogens were subjected to stress treatment. Three groups were set as follows: non inoculation + spraying sterile water, inoculation with Alternaria tenuissima + spraying sterile water, inoculation with Alternaria tenuissima + 0.5 mmol/L salicylic acid, and samples were obtained to measure physiological indexes at 1, 3, 5, 7, 9, 11 d post inoculation, respectively. The results showed that after inoculation with Alternaria tenuissima, the content of chlorophyll, malondialdehyde, and soluble sugar in mango seedlings decreased, while the proline content increased. After treatment with 0.5 mmol/L of salicylic acid, the content of chlorophyll, malondialdehyde, and soluble sugar increased, while the content of proline decreased. Therefore, external application of salicylic acid could reduce the damage of leaf blight on mango seedlings and improve the resistance of mango seedlings to leaf blight.
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