ISHS Acta Horticulturae 269: Symposium on Tropical Fruit in International Trade
EFFECTS OF VAPOR GARD ON POLYGALACTURONASE, MALIC ENZYME AND RIPENING OF HARUMANIS MANGO |
| Authors: | H. Lazan, Z. Mohd. Ali, H. A. Sani |
| Abstract:
Effects of Vapor Gard (VG) on ripening of mango cv. Harumanis with particular reference to variations in polygalacturonase (EC 3.2.1.67, exo-PG) and malic enzyme (EC 1.1.1.40) activity with tissue depth (i.e. inner vs outer mesocarp) were investigated. Inner mesocarp tissue was softer and had higher PG activity than outer mesocarp. The inner tissue also was more acid, contained higher malic enzyme activity but had lower ascorbic acid level than the outer tissue throughout ripening. Treatment of the fruit with VG (1.3% v/v) reduced water loss, retarded firmness decrease, and inhibited the increase in PG activity in both tissues during ripening. VG treatment also inhibited malic enzyme activity as well as reduced the decrease in ascorbic acid to account for the observed delay in the decline in titratable acid level in the respective tissues during ripening. The treatment, however, affected only slightly the increase in total soluble solid during ripening. It appears that VG affected not only ripening but also flavour development (sugar-acid balance) in the fruit. | |
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