Effect of the lactoperoxidase system against causal agents of post harvest mango diseases.
Ducamp-Collin M. N., Loiseau G., Dornier M., Doan Duy Le N'Guyen
Author Affiliation: Cirad UR Qualité des aliments tropicaux, TA 50/PS4 Bd de la Lironde 34398, Montpellier Cedex, France.
: 521-528
Abstract : Studies were conducted to evaluate the effect of the lactoperoxidase system (LPS) on Colletotrichum spp. responsible for mango alterations and on the quality of fruit storage. An in vitro study using LPS showed a negative effect on the growth of Colletotrichum spp. selected and isolated from mango. This fungus was grown at pH 5,5 with optimized culture medium at 30°C. LPS was able to inhibit its growth with the best efficacy at this pH. Following the in vitro study, the LPS effect was directly evaluated on fresh mango cv. Keitt fruits. The fruits were soaked in the LPS solution at 35°C. The bacterial charge on the mango surface was cut down compared to the reference after 120 minutes at 35°C. However, after 2 or 3 weeks of storage at 12°C and 80% relative humidity, the mangoes treated at 35°C (120 minutes) were not significantly different from the reference ones. The effect of LPS on the Keitt mangoes infected by the in vitro selected fungus was also determined. It was observed that the soaking treatment in the LPS solution at 35°C for 120 minutes decreased the disease symptom with respect to the references. These results clearly showed the importance of the LPS treatment for the storage of fresh mangoes. Nevertheless, further studies should be conducted to consider an industrial application.