บทคัดย่องานวิจัย

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Hydrogenperoxide content, superoxide dismutse and catalase activities in Queen and Smooth Cayenne pineapples during cold storage.

Siriphanich J., Nukuntornprakit O.

5th International Postharvest Symposium . Volume of Abstract . Verona, Italy 6-11 June 2004, p.93

2004

บทคัดย่อ

Hydrogenperoxide content, superoxide dismutse and catalase activities in Queen and Smooth Cayenne pineapples during cold storage.    It is well known that pineapples could easily develop chilling injury symptom during storage at low temperature, depending o­n maturity, cultivars, temperature and duration of storage.Queen pineapples are known to be more sensitive to chilling injury than other groups.

Low temperature is believed to cause oxidative stress in plant tissues leading to chilling injury symptom.Hydrogenperoxide content and activities of superoxide dismutase and catalase were determined in the flesh of mature green and half yellow pineapples cv. Phuket (Queen) and Pattavia (Smooth Cayenne) during storage at 10 °C for 3 weeks.Phuket pineapples developed slight internal browning symptom after o­nly o­ne week of storage and more than 50% showed moderate symptom after 3 weeks of storage.Hydrogenperoxide content in Phuket was higher than that in Pattavia pineapples before and during storage.The content in both cultivars declined slightly during storage. Superoxide dismutase activities in both cultivars were about the same and remained relatively stable before and during storage.Catalase activity in Phuket before storage was higher than that in Pattavia.After o­ne week of storage the activity declined to about the same level as in Pattavia.The activity decreased slightly in both cultivars afterward.

The results do not support the hypothesis that low temperature causes oxidative stress in pineapples, and that the different in chilling injury symptom between the two pineapple cultivars is the result of the different in antioxidant enzymes activities.