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Ethylene biosynthesis and polyamine accumulation in apples with watercore

, : Ethylene biosynthesis and polyamine accumulation in apples with watercore. Journal of the American Society for Horticultural Science 117(1): 133-138

Ethylene biosynthesis and polyamine content were determined in normal and watercore-affected apple (Malus domestica Borkh. cv. Delicious). Fruit with watercore produced more ethylene and contained higher amounts of putrescine (PUT), spermidine (SPD), 1-aminocyclopropane-1-carboxylic acid (ACC), and 1-(malonylamino) cyclo-propane-1-carboxylic acid (MACC). The activities of ACC synthase and ethylene-forming enzyme (EFE) in watercore-affected fruit were also higher than in normal fruit. The EFE activity in severely affected flesh was inhibited, resulting in ACC accumulation and low ethylene production. S-adenosylmethionine (AdoMet) was maintained at a steady-state level even when C2H4 and polyamines were actively synthesized in normal and affected fruit.

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