Postharvest crown chemical treatments and application timing on internal browning in four pineapple clones

Pineapple clones differ in their sensitivity to internal browning (IB), with the Queen group being more sensitive than the Cayenne group. However, there is not much information available on the differences in clone sensitivity between the Cayenne groups. The aim of this research was to study the responses of Smooth Cayenne and MD2 (hybrid) after chemical spraying applied to the pineapple crown on the IB and other fruit qualities. The experimental design used was a 3 factorial completely randomized design (4 x 5 x 2), clone (GP3; HC; GP4; MD2), chemical material (50mg L-1 ABA; 200mg L-1 AsA [ascorbic acid]; 1 mM jasmonic acid; 2% calcium chloride; control [H 2O]), and application time 2 (0 and 16 days after harvest). The results showed that the MD2 pineapple clone had greater resistance to IB damage than the Smooth Cayenne type. The Smooth Cayenne type itself had different resistance to IB, with the GP3 clone showing the lowest resistance, followed by HC and GP4. Pineapple resistance to IB was followed by endogenous AsA content; MD2 had the highest AsA content. The susceptibility of GP3 pineapple to IB was also characterized by high ion leakage values. The pineapple postharvest crown-coating applications with chemical materials and/or application time effects on Smooth Cayenne and MD2 types were not effective in suppressing IB severity. Therefore, the need for long pineapple storage of up to 46 days with good quality is recommended only for the MD2 clone.