Abstract
ABSTRACT Two experiments were conducted to evaluate the relative effects of controlled atmosphere (CA) associated with 1-methylcyclopropene (1-MCP; 1.0 μL L−1), induction of mass loss (IML; 2%), and low ethylene (LE; <0.04 μL L−1 of C2H4) on the quality preservation of ‘Laetitia’ plums. In experiment 1 (2010), the treatments evaluated were cold storage (CS; 21.0 kPa O2 + <0.03 kPa CO2), CA1 (1 kPa O2 + 1 kPa CO2), CA1 + 1-MCP, CA1 + IML, and CA1 + LE. In experiment 2 (2011), the treatments evaluated were CS, CA2 (2 kPa O2 + 2 kPa CO2), CA2 + IML, and CA2 + 1-MCP. In both experiments, the fruit were stored at 0.5 ± 0.1°C and 96 ± 2% RH. CA storage delayed fruit ripening in both atmosphere conditions evaluated and reduced the internal browning of the ‘Laetitia’ plums, particularly in CA2. 1-MCP, LE, and IML had additional effects to CA1 on preserving flesh consistency. 1-MCP, irrespective of the CA condition, and IML, in CA1, reduced internal browning. CA1, regardless of the complementary technologies, reduced the incidence of decay and fruit cracking.
Highlights
Internal browning is a process known as cold damage that affects stored plums (SINGH; SINGH, 2013a, b)
The treatments of Experiment 1 were cold storage (21 kPa O2+ CO2
After three days at room conditions, fruits stored in CA1 combined with 1-methylcyclopropene (1-MCP), induction of mass loss (IML) and low ethylene (LE) maintained their flesh firmness and texture attributes higher than those of fruits in CS and CA1 (Table 1)
Summary
Internal browning is a process known as cold damage that affects stored plums (SINGH; SINGH, 2013a, b). This process is caused by an oxidative process related to production of reactive oxygen species and reduction of efficiency of antioxidant systems, with consequent damages to cell membranes (SINGH; SINGH, 2012; 2013a, b). According to Steffens et al (2014), atmospheric conditions with 1 kPa O2+1 kPa CO2 and 2 kPa O2+2 kPa CO2 are considered the best conditions for ‘Laetitia’ plum storage. Even under these conditions, internal browning of ‘Laetitia’ plums may still occur (STEFFENS et al, 2013; 2014). The use of complementary technologies to CA, such as 1-methylcyclopropene (1-MCP), induction of mass loss (IML) and low ethylene (LE) may be alternatives to reduce the occurrence and severity of internal browning
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