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      • Antioxidant Gene Expression Analysis of Cucumber in Recovering Chilling Injury by Storage Temperature Shifting

        ( Nana Takahara ),( Manasikan Thammawong ),( Hushna Ara Naznin ),( Kohei Nakano ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1

        The aim of this study was to explore the optimum temperature treatments for prolonged storage of vegetables avoiding chilling stress. Electrolyte leakage, antioxidant gene expressions and ascorbic acid (AsA) were analyzed in cucumber fruits, stored at different temperature conditions to reveal the relationship between the reversibility of chilling injury (CI) and antioxidant activity. Results showed that electrolyte leakage from cucumber fruit was increased during storage at 2°C, however, it decreased when storage temperature was changed from 2°C to 15°C on 3rd and 6th day of storage, that is, CI was reduced. On the other hand, electrolyte leakage continued to increase, even storage temperature was changed on 9th day of storage; CI was progressed. In addition, the expressions of CsAPX and CsSOD1 were always found increased when the storage temperature was changed at any storage length. Meanwhile, the expression of CsCAT was found increased only when storage temperature was changed on 3rd day of storage and it was reduced in spite of changing of the store temperature on 6th and 9th day of storage. From these observations, antioxidant activity might be accelerated when fruits were moved from low temperature to over the critical temperature for chilling stress, as a result, accumulation of reactive oxygen species (ROS) was decreased to recover the membrane function leading to the reversibility of chilling injury by 6 days of storage. In addition, expression of CsCAT was reduced when storage temperature was changed after 6th day of storage. However, excessive accumulation of ROS at 9 days caused by long storage at 2°C, the decreasing of CsCAT gene expression and lower production of AsA lead to the irreversibility of chilling injury.

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