Effects of CO2 on respiratory metabolism in ripening banana fruit.
Shigang Liu, Yongli Yang, Hideki Murayama, Satoshi Taira and Tadaaki Fukushima ,
Postharvest Biology and Technology Volume 33, Issue 1 , July 2004, Pages 27-34
2004
บทคัดย่อ
Green bananafruit,which had been exposed to ethylene for 24 h, were kept in air or 60% CO2 + air. In controlfruit,a typical climacteric curve ofrespirationwas observed. Citrate and malate continued to accumulate throughout the experimental period. This suggests a glycolytic carbon flow exceeding that of the TCA cycle throughout the ripening period. The content of 2-oxoglutarate and activity of NADP-linked isocitrate dehydrogenase (NADP-IDH) changed approximately in parallel to the climacteric pattern ofrespiration.By contrast, with the CO2 treatment, the respiratory climacteric was suppressed along with decreasing contents of pyruvate, 2-oxoglutarate, and malate. However, there was accumulation of citrate and succinate, with citrate mostly equal to and the latter exceeding levels in controlfruit.Activity of NADP-IDH was strongly suppressed by CO2 exposure. In addition, high concentrations of CO2 decreased the oxidative activity of NADP-IDH in an in vitro assay, indicating a decrease in production of 2-oxoglutarate.