Total phenolic content in ?Super Haden? mango fruits damaged by anthracnose and treated in postharvest
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Abstract
is related to their own defense mechanisms against fungal
pathogen attack. Colletotrichum gloeosporioides (Penz.) Penz.
& Sacc. causes anthracnose in mango (Mangifera indica L.)
thereby high postharvest losses. The aim of this study
was to evaluate the total phenolic content in damaged and
postharvest treated ‘Super Haden’ mango fruits, to make
evident its relationship with the defense mechanisms
against pathogen infection. Exocarp samples were taken
from healthy and anthracnose-damaged (mild, moderate
and severe levels) fruits as well as from those postharvest
treated with hot water (53 °C for 5 min), polyethylene wax
(10 % ST) plus imazalil (800 mg L-1), polyethylene wax
(10 % ST) plus imazalil (800 mg L-1) plus two bags of
Conserver 21 and a control without application. Samples
were lyophilized and the total phenolic content was
determined by the method suggested by Slinkard and
Singleton (1977) with some modification. Anthracnoseaffected
fruits showed a lower total phenolic content:
59,25 at the mild degree, 58,63 at the moderate and
56,52 mg of galic acid g-1 fresh weight at the severe level,
showing significant differences between damage levels and
health fruits. Postharvest treatments increased total phenolic
content. Hot water and the combination of polyethylene wax
plus imazalil showed values of 37,58 and 37,11 mg of galic
acid g-1 fresh weight respectively, compared with the control
value of 33,94 mg galic acid g-1 fresh weight, showing a
correspondence with a lower disease occurrence.
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