Abstract

Nang klangwan and Tainong mango fruits were treated with benzo-thiadiazole-7-carbothioic acid S-methyl ester (BTH). The effect of BTH treatment on the resistant substance in postharvest fruits was evaluated to explore the enhanced disease-resistance mechanisms of mango fruits by BTH from different varieties. Results indicate that the main resistant substance such as total phenolic, flavonoid, ligin and hydroxyproline-rich glycoprotein (HRGP) content were obviously increased by BTH treatment in different varieties. However, the increase in resistant substances ofTainong mango fruit was higher than that in Nang klangwan fruit. At the same time,Tainong fruit without BTH treatment had relatively higher level of these resistant substances than Nang klangwan mango fruit, especially in the contents of phenolic compounds and lignin.

Key words: Mango, total phenolic, flavonoid, ligin, hydroxyproline-rich glycoprotein (HRGP).