Postharvest application of Burkholderia cepacia supplemented with chitosan and calcium chloride to control anthracnose and improve the storability of papaya
Mahmud, T.M.M., Rahman, M.A. , Kadir, J. and abdul Rahman, R.
Abstracts Book, 6th International Postharvest symposium, 8-12 April 2009, Antalya, Turkey. 256 pages.
2009
บทคัดย่อ
A study was conducted to evaluate the biocontrol potential of Burkholderia cepacia strain B23 to control anthracnose and extension of storage life of papaya. This strain of B. cepacia was isolated from papaya fruit surface and exhibition strong antagonistic activity towards Colletotrichum gloeosporioides during in vitro screening. Combining B. cepacia with 0.75% chitosan and 3% calcium chloride gave complete control of the disease in inoculate fruit stored at 14 ºC and 95% RH for 18 days, which was comparable to fungicide treatment. However, This combination offered a greater control by reducing 99% disease compared to the control in naturally infected fruits, which was superior to that obtained from the fungicide benocide®. Furthermore, the combination of B. cepacia-chitosan-CaCl2 delayed climacteric ethylene evolution, reduced respiration rate, retained fruit firmness, decreased weight loss and delayed the change in external color without impairing fruit quality during storage at 14 ºC and 95% RH for 28 days. These resulted in extension of storage life of the fruits. Nevertheless, the addition of 3% CaCl2 into the combined treatment significantly increased the fruit Ca content thus improved the nutritional value of papaya.