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Response to concentration of 1-methylcyclopropene (MCP) in three summer apple cultivars when treated and stored at 20C and 1C

C. Lu and P.M.A. Toivonen

Proceedings of 26th International Horticultural Congress. Volume of Abstract . Toronto, Canada, 11-17 August, 2002. Abstract S09-P-115C. pp. 13.

2002

บทคัดย่อ

Response To Concentration of 1-Methylcyclopropene(MCP) in Three Summer Apple Cultuvars When Treated and Stored at 20C and 1C.

Summer ripening cultivars ‘Sunrise’,‘Silken’ and ‘Ginger Gold’ apples have a limited post-harvest life.These cultivars are generally not stored for a long time and many are marketed very quickly.In the case where they are marketed at fruit stands, the cooling step in the handling protocol adds to costof handling.This test was conducted to see if a reasonable shelf life could be attained without the use of refrigeration.Fruit were treated for 12 hours with 0.1, 0.25, 0.5 or 1.0 ppm 1-methylcyclopropene (1-MCP) at 1C or 20C.Following treatment, fruits were subsequently held at the treatment temperature for three weeks in air and then were held an addition seven days 20C to simulate a shelf handling.1-MCP treated apples of all three cultivars maintained significantly better firmness and titratable acidity levels than control (untreated) fruit when held at 20C.The treatment resulted in a 5-pound advantage in flesh firmness and 0.2% advantage in titratable acidity retention.1-MCP treated applesalso exhibited less ground color change.A concentration of 0.1 ppm 1-MCP was sufficient to provide maximal inhibition of ripening when treatment was applied at 20c.In ‘sunrise’ apples 1-MCP effects at the 1C treatment temperature were greatly reduced in comparison with effects seen at the 20C treatment.A one-pound firmness advantage was found for fruit treated with 1.0 ppm 1-MCP at 1C and stored three weeks at 1C.The results suggest that four weeks shelf life can be achieved at 20C with 1-MCP treatment for ‘Sunrise’ , ‘Silken’, and ‘Ginger Gold’.These cultivars may be subject to chilling injury and hence the effectiveness of 1-MCP treatment is impaired at the lower treatment and storage temperature.