Mangiferin (l,3,6,7-tetrahydroxyxanthone-C_2-beta-D-glucoside), a Phenolic Metabolite of Mango (Mangifera indica L.), Affects Germination of Spore of Fusarium sp.

摘要

Malformation is a destructive disease of mango (Mangifera indica L.). Fusarium sp. was isolated from malformed as well as healthy tissues of mango cultivars growing in different geographical regions. The concentration of mangiferin (1,3,6,7-tetrahydroxy-xanthone-C_2-beta-D-glucoside) was higher in malformed tissues (500, 625, 530 mu g/g fr wt in malformed floral tissues and 788, 840, 800 mu g/g fr wt in malformed vegetative tissues, respectively) compared to the healthy tissues (275, 310, 290 mu g/gfr wt in healthy floral tissues and 410, 385, 450 mu g/g fr wt in healthy vegetative tissues, respectively) of mango cultivars, viz. Mallika, Dashehari and Baramasi. Mangiferin inhibited germination of spores of Fusarium sp. and inhibitory response was maximum at its higher concentrations. The results revealed that higher concentration of mangiferin in diseased tissues may lower the level of Fusarium sp. infection inside the diseased tissues as it was found to inhibit the germination of spores and impede the normal growth of Fusarium sp.