Relationship between Disease Resistance and Fruit Cuticle of Jinhuang and Guifei Mangoes

Abstract:

In order to examine the relationship between disease resistance and the cuticle of mango fruits, the more disease resistant Jinhuang and less disease-resistant Guifei mangoes were selected from five mango varieties and analyzed using wax stripping, in vitro bacteriostatic, scanning electron microscopy (SEM), and gas chromatography-mass spectrometry (GC-MS). The results showed that Jinhuang mangoes exhibited a disease index of 37.83%, considerably lower than the 86.72% observed in Guifei mangoes after 12 days of storage. After the complete removal of wax, the occurrence of anthracnose notably affected the two mango varieties. In vitro antibacterial results showed that the wax from the two varieties of mangoes did not exhibit any obvious inhibitory effect on the hyphal growth of Colletotrichum gloeosporioides. SEM results showed that Jinhuang mangoes possessed a denser waxy morphology and remarkably higher wax content than Guifei mangoes, indicating a superior barrier effect of the Jinhuang mango wax. GC-MS results showed that the primary wax components of Jinhuang and Guifei mangoes were aldehydes and alcohols, respectively, with the terpenoids isopterene and β-serinene detected in the inner wax of both varieties. The cuticle monomer matrix in Jinhuang mango was 1.55 times that in Guifei mango. This study revealed a strong correlation between disease resistance in mango fruit and the cuticle, providing theoretical and technical support for the storage, transportation, and preservation of mango fruits.