Effect of gaseous ozone exposure on the quality attributes and control of Colletotrichum gloeosporioides of papaya during ambient storage
Ong Mei Kving, Feroz Kabir Kazi, Asgar Ali
Abstracts of 7th International Postharvest Symposium 2012 (IPS2012). 25-29 June, 2012. Putra World Trade Centre (PWTC), Kuala Lumpur, Malaysia. 238 pages.
2012
บทคัดย่อ
The effect of gaseous ozone to control postharvest decay of papaya, particularly anthracnose caused by the fungus Colletotrichum gloeosporioides was investigated. Different concentrations of ozone (0 (control), 1.5, 2.5, 3.5 and 5ppm) were applied for 96 hour at room temperature (25±3°C) in a completely randomized design setup with 4 replications. Radial mycelial growth and conidial germination were evaluated in vitro after fungal exposition to different irradiation doses. The effects of ozone on disease incidence and severity of papaya which were inoculated with the C. gloeosporioides during ambient storage (25±3°C, 60% relative humidity) for 14 days were also determined. Significant (P<0.05)inhibition in radial mycelial growth of C. gloeosporioides was observed in all treatments of ozone as compared to the control during 8 days of incubation at room temperature (25±3°C). However, the maximum inhibition in radial mycelial growth and conidial germination was observed in petri plates exposed to 5 ppm of ozone for 96 h (41.20%) and (100%), respectively. Microscopic analysis showed that ozone exposure to 5 ppm caused disintegration of spore. Exposure of fruits to ozone also leads to significant suppression of disease incidence and severity in papaya. Therefore, these results support the application of gaseous ozone as a safe non-thermal food preservation technique for papaya, which can be used successfully as an alternative to chlorination.