Changes in beta-cyanoalanine synthase activity and prunasin content in peach [Prunus persica] flower buds during dormant period
1998
Mizutani, F. (Ehime Univ., Matsuyama (Japan). Coll. of Agriculture) | Hirota, R. | Rabbany, A.B.M.G. | Akiyoshi, H. | Amano, S. | Hino, A. | Kadoya, K.
Changes in beta-cyanoalanine synthase (CAS) activity and prunasin content in peach buds were investigated during dormant period. But weight remained unchanged or only slightly increased before early February but rapidly increased with bud swelling. The beta-CAs activity was very low before it began to rise in early December and increased greatly toward bud burst. The content of cynanogenic glucoside, prunasin, tended to decline slightly from middle october to middle December but then increased concomitantly with beta-CAS activity. Fructose was consistently lowest among sugars before early December, followed by a gradual increase. Glucose decreased from middle October to middle November and thereafter increased. On the other hand, sucrose started to increase in middle October and peaked in early January and then declined. Sorbitol, the largest constituent among sugars, began to increase sharply in early December to reach a maximum in early February. It seems sugar metabolism operates even in dormant flower buds and that cyanide metabolism begins to the activated long before noticeable swelling of buds
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