Effect of harvest maturity, storage condition and duration, on internal flesh browning and quality of 'Rosy Glow' apples grown in South Africa
'Rosy Glow' apple, being a sport variety of 'Cripps' Pink' apples, is regarded prone to internal flesh browning as its parent cultivar. This study investigated the effect of harvest maturity, storage temperature, 1-methylcyclopropene (1-MCP, SmartFreshTM) treatment and storage duration in controlled atmosphere (CA) as factors influencing 'Rosy Glow' internal browning. Fruit were harvested at <40 and >50% starch breakdown (SB) for the harvest maturity trial (Trial 1) and <40% SB for the storage duration, temperature and 1-MCP trial (Trial 2). Trial 1 fruit was stored for 7 months in CA (1% CO2 and 1.5% O2) plus 6 weeks in regular atmosphere (RA) at -0.5°C and 7 d at 20°C and evaluated after each period. Trial 2 fruit treated with or without 1-MCP, was stored at -0.5 or 2°C and evaluated after 3, 5 and 7 months in CA plus 6 weeks in RA at -0.5°C and 7-day shelf-life (SL) period at 20°C. The fruit was evaluated for internal flesh browning types at the end of each storage period. Diffuse-, radial-, combination- and carbon dioxide (CO2) browning were observed. Optimum harvested fruit proved to be less susceptible to diffuse- and radial browning. Fruit treated with 1-MCP had lower internal browning incidence. The fruit quality was better retained at -0.5 than at 2°C, which was different to previous 'Cripps' Pink' research findings. Diffuse and radial browning was first observed after 5 months in CA plus 6 weeks RA at -0.5°C. Diffuse browning was the most dominant browning type present. Post-harvest maturity (>50% SB) played a significant role in 'Rosy Glow' browning development. In this study fruit quality was better retained at -0.5 than at 2°C, while 1-MCP treated fruit maintained better quality than control fruit over time.
Doe, J.W., Schoeman, L. and Crouch, E.M. (2018). Effect of harvest maturity, storage condition and duration, on internal flesh browning and quality of 'Rosy Glow' apples grown in South Africa. Acta Hortic. 1201, 41-48
Malus × domestica, 1-methylcyclopropene (1-MCP), storage duration, diffuse browning, radial browning, controlled atmosphere