ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Roles of elevated carbon dioxide on postharvest chilling susceptibility in ‘Moschata’ squash

K.-A. Lee and Y.-J. Yang

Dept. of Horticultural Science, Sangmyung Univ.. ansedong 98-20, Chonan, Chungnam, 330-180 Korea

2002

บทคัดย่อ

Effects of CO₂ on chilling susceptibility and physiological changes were investugated during cold storage of squash. The severity of chilling injury (CI) in squash stored at 4 ⁰C was redece by 5 and 10 % CO₂ treatments. Squash treated with 10% CO₂ showed CI below 10% when stored for 18 days at 4 ⁰C and then 20 ⁰C for 2 days. Little effect was found with 1% CO₂ on reduction at CI. Some physiological parameters such as electrolyte leakage and carbon dioxide proportionally increased with the increases of CI and storage duration. The maintenance of catalase, peroxidase and supersoide dismutase activities in CO₂ treated squash was apparently important to maintain the benefical effect on reduction of chilling susceptibility through the defence mechanisms against hydrogen perocide. The different effectiveness of the CO₂ concentrations in increasing chilling tolerance of moschata squash may be related to different activities of antioxidant enzymes, especially catalase, during chilling stress. Accelerated increases of ethylene production paralled increases in ACC content after the squash were transferred from 4 ⁰C, air to 20 ⁰C, air. The treatments of 10% CO₂ effectively reduced these increase of ACC and ethylene. The level of ACC in non-chilled squash was low and remained unchanged after transfer to 20 ⁰C.