Response of Four Apple Cultivars to 1-Methylcyclopropene Treatment and Controlled Atmosphere Storage

By Jinhe Bai, Elizabeth A. Baldwin, K. Goodner, J. Mattheis, J. Brecht. 2005

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Additional index words. Malus sylvestris var. domestica, fi rmness, titratable acidity, volatile abundance, 1-MCP, CA Abstract. Apples (Malus sylvestris (L.) Mill var. domestica (Borkh.) Mansf. ('Gala', 'Deli- cious', 'Granny Smith' and 'Fuji')), pretreated or nontreated with 1-methylcyclopropene (1-MCP, 0.6 to 1.0 µL·L -1 for 18 hours at 20 °C), were stored in controlled atmosphere (CA, 1 to 1.5 kPa O 2 ; 1 to 2 kPa CO 2 ) or in regular atmosphere (RA) for up to 8 months at 1 °C. Firmness, titratable acidity (TA), soluble solids content (SSC), and volatile abundance were analyzed every month directly or after transfer to air at 20 °C for 1 week to determine effect of 1-MCP, storage atmosphere and storage time on apple quality immediately after cold storage and after simulated marketing conditions at 20 °C. The 1-MCP ± CA treatments delayed ripening and prolonged storage life as indicated by delayed loss of fi rmness and TA in all four cultivars during storage. The 1-MCP ± CA also slightly delayed loss of SSC for 'Gala' but had no effect on SSC levels for the other cultivars. There were differences among treatments for fi rmness and TA content ((1-MCP + RA) > CA) for 'Gala', 'Deli- cious', and 'Granny Smith' apples, but not for 'Fuji'. These differences were generally exacerbated after transfer of fruit to 20 °C for 1 week. A combination of 1-MCP + CA was generally best ((1-MCP + CA) > (1-MCP + RA) or CA) for maintaining 'Delicious' fi rmness and TA. However, the treatments that were most effective at retaining TA and fi rmness also retained the least volatiles. The results indicate that the effi cacy of 1-MCP and CA in maintaining apple quality factors is cultivar dependent and that 1-MCP + RA may be a viable alternative to CA for optimal eating quality for some cultivars.

Subfields: Plant Science

View Paper: https://www.semanticscholar.org/paper/1a7ebd171959e0e62b130b514e3e238ee93bf371

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