Relationship between susceptibility to Anthracnose disease and antifungal compounds content in fruit latex of Thai mango

Abstract

Mango has a different degree of susceptibility to Anthracnose disease. In the previous study, it was found that latex contained some antifungal compounds which had an effect to control Anthracnose disease caused by Colletotrichum gloeosporioides. Eight commercial mango cutivars, namely 'Nam Dokmai #4', 'Rad', 'Kaew', 'Kaew Juk', 'Keaw Sawaey', 'Chok Anan', 'Keaw Moragot' and 'Mahajanaka', were studied for susceptibility to Anthracnose disease. The relationship between susceptibility to Anthracnose disease and antifungal compounds content in fruit latex were investigated. Crude extract of latex was separated and tested. It was found that antifungal compounds presented only in water insoluble fraction. Most of the antifungal compounds were found in 'Kaew' which was the least susceptible to Anthracnose disease whereas 'Nam Dokmai #4' had the least antifungal compounds and it showed the most susceptible to Anthracnose disease. The cultivar showing greater susceptibility to Anthracnose disease had a lower antifungal compounds fraction content in the fruit latex. The amount of antifungal compound in the fruit latex in each mango cultivar varying from low to high level was 'Nam Dokmai #4', 'Rad', 'Keaw Moragot', 'Mahajanaka', 'Kaew Juk', 'Keaw Sawaey', 'Chok Anan' and 'Kaew', respectively. The result showed that antifungal compounds played an important role in controlling Anthracnose disease.