UV-C induced resistance in mango (Mangifera indica L.) against anthracnose caused by Colletotrichum gloeosporioides Penz.
2004
Alcala, A.V.C.
The use of UV-C irradiation treatment to control anthracnose caused by Colletotrichum gloeosporioides Penz. through induced resistance mechanism on mango fruits were determined in this study. Mango fruits exposed to UV-C (provided by a 15-watt UV lamp with 254 nm wavelength) for 20 minutes at distance of one meter from the source provided the lowest disease severity and incidence. UV-C fruits stored at 13 deg C exhibited greener peel color, better visual quality and lower disease severity than non-treated fruits up to two weeks of storage. Effects of UV treatment in conjunction with low temperature storage (13 deg C) led to better control of anthracnose on mango fruits than that of UV treatment followed with ambient storage. UV-C treatment did not adversely affected the total soluble solids, titratable acidity, pH and respiratory activity of the fruits. The treatment suppressed ethylene production thus, delaying ripening. It increased phenylala nine ammonia lyase activity which may account for the control of anthracnose through induced resistance mechanism. However, no significant difference in peroxidase activity was noted between treated and non-treated fruits.
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