Effect of Controlled-atmosphere Storage on Ascorbate-glutathione Metabolism in Kiwifruit
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Abstract:
Potential mechanisms underlying the effects of controlled-atmosphere (CA) storage on the senescence of the kiwifruit cultivar Hongyang were studied. The effect of different gas compositions [CA1 (2% oxygen + 3% carbon dioxide), CA2 (2% oxygen + 6% carbon dioxide), CA3 (5% oxygen + 3% carbon dioxide), and CA4 (5% oxygen + 6% carbon dioxide), with CK (20.9% oxygen + 0.04% carbon dioxide) as control] was investigated on soluble solid (SSC), total soluble sugar, starch, titratable acid (TA), ascorbic acid (AsA), and glutathione (GSH) content; scavenging capacities of 2,2-diphenyl-1-picrylhydrazyl (DPPH) and superoxide anions; and the activities of enzymes involved in the ascorbate-glutathione cycle in postharvest kiwifruit. The results showed that treatment with CA1 inhibited the increase in SSC and total soluble sugar content, as well as alleviated the decrease in starch and TA content compared with CK and the other CA treatments. In addition, treatment with CA1, CA2, and CA3 increased AsA and GSH content in kiwifruit as compared to that with CA4 and CK. Moreover, treatment with CA1, CA2, and CA3 alleviated the decrease in superoxide anion- and DPPH-scavenging rates as well as the activities of enzymes involved in the ascorbate-glutathione cycle in kiwifruit, of which CA1 treatment showed the strongest effect. Therefore, senescence inhibition in the kiwifruit cultivar Hongyang by CA1 treatment was associated with higher AsA and GSH content.
