Abstract
ABSTRACT The storage life of ‘Alexander Lucas’ pear is limited by the occurrence of internal storage disorders during controlled atmosphere (CA). 1-Methylcyclopropene (1-MCP) can be used to delay pear ripening, however, its interaction with CA conditions is not well understood. ‘Alexander Lucas’ fruit were treated with 1-MCP at 300 nL L-1 for 24 h in air at-0.5 or 1.0 °C before being stored. Fruit were kept at-0.5 or 1.0 °C in normal air or CA (2.0 kPa O2 plus <0.7 kPa CO2). After six months of storage, superficial scald did not develop in fruit. The highest incidence of flesh browning (72.2 %) was found in air-stored fruit at-0.5 °C without 1-MCP treatment. Storage in air at 1.0 °C plus 300 nL L-1 1-MCP produced 88.8 % of healthy fruit. In contrast, 1-MCP increased the incidence of flesh and core browning under CA conditions. 1-MCP and CA maintained greener skin color and higher titratable acidity. No significant differences were found for fruit firmness, total soluble solids and ascorbic acid content between the treatments. In conclusion, the quality of ‘Alexander Lucas’ pear was best maintained during six months storage under normal air at 1.0 °C combined with 300 nL L-1 1-MCP treatment.
Highlights
The storage life of ‘Alexander Lucas’ pear is limited by the occurrence of internal storage disorders during controlled atmosphere (CA). 1-Methylcyclopropene (1-MCP) can be used to delay pear ripening, its interaction with CA conditions is not well understood
CA storage can induce the development of internal physiological disorders in ‘Alexander Lucas’, with the frequent formation of cavities occurring in fruit flesh when O2 partial pressures are kept below 3.0 kept in storage pO2 (kPa) or carbon dioxide partial pressures are above 0.7 kPa (GARCIA; STREIF, 1993; STREIF; SAQUET, 2006)
‘Alexander Lucas’ is susceptible to superficial scald, and the lack of symptoms may be explained by seasonal variability or attributed to the slightly advanced maturity of the fruit at harvest
Summary
The storage life of ‘Alexander Lucas’ pear is limited by the occurrence of internal storage disorders during controlled atmosphere (CA). 1-Methylcyclopropene (1-MCP) can be used to delay pear ripening, its interaction with CA conditions is not well understood. 1-MCP could maintain satisfactory fruit quality under both air and CA storage, for late harvested pears. The challenge for the long-term CA storage of ‘Alexander Lucas’ pears is to prevent the development of superficial scald and internal physiological disorders while maintaining acceptable fruit quality for further marketing and consumption.
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