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This paper reports on the production of CO<SUB>2</SUB> and C<SUB>2</SUB>H<SUB>4</SUB> and the factors concerned with the development of cyanide-resistant respiration in potatoes induced by gamma radiation.<BR>Gamma irradiation even at the dose level of sprout-inhibition of potatoes temporarily increased CO<SUB>2</SUB> production and O<SUB>2</SUB> consumption of whole potatoes and a small amount of C<SUB>2</SUB>H<SUB>4</SUB> evolution was also found within 20 hours in irradiated sample (Fig. 3). Irradiation also induced C<SUB>2</SUB>H<SUB>4</SUB>evolution by disks of path and epidermal tissues within several hours after irradiation (Table 1).<BR>The succinate oxidation of mitochondria from irradiated potatoes 3 days after irradiation was considerably increased by the addition of ATP (Fig. 4 and Table 2). Parts of this increased respiration would be involved in the development of cyanide-resistant respiration.<BR>It was noted that in mitochondria from irradiated potatoes 3 days after irradiation the activity of ATPase was slightly higher than that of unirradiated sample but the ATP formation from ADP in the respiratory chain was similar extent to that of unirradiated ones (Table 3 and 4). When mitochondria isolated from unirradiated potatoes were irradiated at the doses of 10 and 50 krad, the irradiated mitochondria did not show the increase of succinate oxidation and the lowering of respiratory control ratio compared with those of unirradiated ones (Table 5).<BR>The CO<SUB>2</SUB> production of potatoes increased within 20 hours after the treatments of 1 or 10 ppm ethylene (Fig. 5), and mitochondria isolated from the ethylene-treated potatoes exhibited the cyanideresistant respiration (Table 6). When mitochondria from unirradiated potatoes were treated with dopa, cinnamic acid, p-cumaric acid, caffeic acid, chlorogenic acid, or ferulic acid, cyanideresistant respiration slightly developed in the mitochondria treated with chlorogenic acid and caffeic acid among these compounds (Fig. 6 and Table 7).<BR>These results suggest that the development of cyanide-resistant respiration in mitochondria of irradiated potatoes might be induced by some factors in potatoes influenced with irradiation.
- 日本食品照射研究協議会の論文
日本食品照射研究協議会 | 論文
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