บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Relationship between O2 levels, 1-methylcyclopropene (1-MCP), conjugated trienes (CT) and superficial scald in Granny Smith apples

Folchi A.; Pratella G.C. and Gregori R.

5th International Postharvest Symposium . Volume of Abstract . Verona, Italy 6-11 June 2004, p.106

2004

บทคัดย่อ

Relationship between O2 levels, 1-methylcyclopropene (1-MCP), conjugated trienes (CT) and superficial scald in Granny Smith apples Granny Smith apples were stored for 180 days at 0°C in 0.3%, 0.6%, 0.9%, 1.2%, 20.% and 21% O2 (air) plus 0.01% CO2 , same lots were postharvest treated with 625 ppb 1-methylcyclopropene (1-MCP). The influence of these treatments o­n conjugated trienes (CT) and superficial scald as well as o­n ethanol content in the fruit tissue was evaluated.

At harvest the CTs content in the peel, expressed as optical density (OD268), was 0.22 OD268. During storage, the OD remained substantially unchanged in apples exposed to 0.3% O2 (<0.35 OD268), and increased moderately in apples exposed to 0.6%, 0.9% and 1.2% O2 up to 1.42, 1.83 and 1.94 OD268 for 180 days In apples stored in 2.0% O2 and in air (21% O2), CTs contents had the highest increase and reached 4.6 and 11.5 OD268 respectively. In apples treated with 625 ppb 1-MCP the CTs content in the peel was 0.66 OD268 at the end of storage.

The first symptoms of superficial scald appeared after 60 days in air and after 120 days in 2% O2. At the end of storage period no symptom was detected o­n the apples treated with 1-MCP and with 0.3%, 0.6% O2, whilst from 10 to 14% of the fruit kept in 0.9% and 1.2% were affected.

Low-O2 conditions induced the accumulation of ethanol in the tissue, the rate being considerably more marked in the 0.0% to 0.6% rage and linearly correlated to the time in storage. After 60 and 120 days of storage in 0.3% O2, the apples showed symptoms of hypoxic injuries and off flavour while at higher values were undamaged.