Open AccessControl of Anthracnose by Chitosan through Stimulation of Defence-Related Enzymes in Eksotika II Papaya (Carica papaya L.) Fruit
Author(s) -
Asgar Ali,
Mahmud Tengku Muda Mohamed,
Yasmeen Siddiqui
Publication year - 2012
Publication title -
journal of biology and life science
Language(s) - English
Resource type - Journals
ISSN - 2157-6076
DOI - 10.5296/jbls.v3i1.1306
Subject(s) - carica , chitosan , postharvest , chitinase , inoculation , peroxidase , horticulture , chitin , biology , enzyme , tropical fruit , food science , chemistry , botany , biochemistry
The ability of chitosan to induce disease resistance in harvested Eksotika II papaya fruit was investigated in relation to the activities of several defence-related enzymes. Harvested papaya fruit were dipped in various concentrations of chitosan solutions (0.5, 1.0, 1.5, 2.0%) along with an untreated control and stored at 12 ± 1°C and 80-90% relative humidity for 15 days. Disease incidence and the activities of defence-related enzymes were monitored during storage. Compared with untreated fruit, chitosan treatments significantly reduced the severity of disease in fruit inoculated with Colletotrichum gloeosporioides. The activities of defence-related enzymes peroxidase, chitinase, β-1,3-glucanase and total phenolic compounds were all significantly enhanced in 1.5 and 2.0% chitosan treated papaya fruit as compared to the control and 0.5% chitosan. Therefore, it could be suggested that postharvest decay in papaya can be minimized by chitosan application on a commercial scale.