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Studies on the controlled atmosphere ca storage of fruits and vegetables x. effect of carbon dioxide in storage atmosphere on the metabolism of organic acids in satsuma mandarin citrus unshiu marc fruits


Studies on the controlled atmosphere ca storage of fruits and vegetables x. effect of carbon dioxide in storage atmosphere on the metabolism of organic acids in satsuma mandarin citrus unshiu marc fruits



Research Bulletin of the Aichi ken Agricultural Research Center 21: 253-262



These studies were carried out to clarify the mechanism of synthesis and accumulation of organic acids in Satsuma mandarin, by measuring enzymatic activities relating to organic acid synthesis and the amount of 14CO2 fixation and 14C in the components of the fruit during the growing and storing stage. The results obtained are as follows: 1. Enzymatic activities in skin and flesh of fruits were measured in each stage. The activities of isocitrate dehydrogenase, phosphoenolpyruvate carboxylase, citrate synthetase were higher in the juice of flesh vesicle tissue than the juice of skin's, while the activity of aconitase was almost same in both tissues. 2. The activity of citrate synthetase was observed similar degree in both fraction of soluble and mitochondria those separated by centrifuging method, while the activity of malate dehydrogenase was higher in the soluble fraction and the activity of NAD dependent isocitrate dehydrogenase was higher in the mitochondrial fraction. 3. The change of enzymatic activities were measured with the fruits during growing and storing stage. The activity of NADP dependent isocitrate dehydrogenase was scarcely observed at early stage (July) of fruit growth, however it increased in accordance with the fruit development, and these tendency maintained during the first one month of storage at 0.degree.C. The activity of malate dehydrogenase kept higher level at early stage, subsequently decreased to the lowest level at October with the development of the fruits. Thereafter increased again and reached to the peak one month after in storage. The activity of citrate synthetase increased throughout the stages of development and the first one month of storage. 4. The enzymatic activities were measured with the fruits which were mechanically shocked or stored in various circumstances. The activity of phosphoenolpyruvate carboxylase in the fruits shocked or stored at high temperature (> 30.degree.C) and high relative humidity (100%) was lower as compared with those in the non-shocked fruits or the fruits stored at 3.degree.C with humidity of 85%. The activity of isocitrate dehydrogenase was higher both in skin and flesh of fruits stored in high humidity than those in low humidity, and was higher in the skin of fruits stored in high concentration of CO2 in atmosphere than the ones stored low CO2 condition. While it was lower in the flesh of shocked fruits than non-shocked ones. 5. Fruits mechanically shocked or stored in various circumstances were laid in the dark room filled with atmosphere including 14CO2 for 24 hours. After that the amount of 14C incorporated into soluble fraction fruits were measured. Total 14C activity in the flesh of fruits stored in high concentration of CO2 or stored after shocked was lower than those stored in low CO2 or non-shocked. 14C14 activities in components of fruit which were separated by ion-exchange resins were measured. The activities were lower in the fraction of amino acids of fruit stored in high concentration of CO2 and in the fraction of organic acids in the fruit shocked than others.

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Related references

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