| Budget Amount *help |
¥6,200,000 (Direct Cost: ¥6,200,000)
Fiscal Year 1986: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1985: ¥5,700,000 (Direct Cost: ¥5,700,000)
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| Research Abstract |
Cyanide metabolism involved in ethylene biosynthesis was investigated with horticultural crops, especially with ripening fruits. Climacteric fruits, which show the typical climacteric increases in respiration and ethylene production, increased <beta> -cyanoalanine synthase activities during their ripening processes. On the other hand, non-climacteric fruits, which show neither increases in respiration nor in ethylene production, did not increase <beta> -cyanoalanine synthase activities during ripening processes. However, even the non-climacteric fruits showed a slight increase in ethylene production during their senescence processes; simultaneous increases in <beta> -cyanoalanine synthase activities were also observed although the levels were not comparable to those of climacteric fruits. Concomitant increases in the cyanide content and <beta> -cyanoalanine synthase activity were found in the ethylene biosynthesis induced by wounding apple flesh tissues. The development of cyanide-resistant respiration during the ripening processes of climacteric fruits may be associated with the increase in <beta> -cyanoalanine synthase activity.
In conclusion, cyanide metabolism is closely linked with ethylene biosynthesis and thus ethylene biosynthesis is thought to be a part of amino acid metabolism in terms of nitrogen metabolism.
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