Resumo

PEREZ MARQUEZ, Akira; VIDAL AGUIAR, Yamile  e  MULKAY VITON, Tania. Total phenolic content in 'Super Haden' mango fruits damaged by anthracnose and treated in postharvest. cultrop [online]. 2016, vol.37, n.1, pp. 71-77. ISSN 1819-4087.

Total phenolic content in the exocarp of fruits 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. Anthracnose-affected 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

Palavras-chave : anthracnose; exocarp; phenol; mango.

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