Changes in Cyanogenic Glycoside Content and β-Cyanoalanine Synthase Activity in Flesh and Seeds of Japanese Plum (<i>Prunus salicina</i> Lindl.) during Development

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  • 発育中の日本スモモの果肉と種子における青酸配糖体含量とβ-シアノアラニン合成酵素活性の消長
  • 発育中の日本スモモの果肉と種子における青酸配糖体含有量とβ-シアノアラニン合成酵素活性の消長〔英文〕
  • ハツイクチュウ ノ ニホン スモモ ノ カニク ト シュシ ニ オケル セイサ
  • Changes in Cyanogenic Glycoside Content and ^|^beta;-Cyanoalanine Synthase Activity in Flesh and Seeds of Japanese Plum (Prunus salicina Lindl.) during Development

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Changes in cyanogenic glycoside content and β-cyanoalanine synthase activity were determined in the flesh and seeds of Japanese plum(Prunus salicina Lindl.) during development. In the flesh, only prunasin was detected at levels as low as 0.6mg/g dw at the earliest sampling date (May 4) and became soon undetectable. Similarly β-cyanoalanine synthase activity, which showed 0.3μmol H2S/g fw/hr on May 4, gradually decreased to undetectable levels in late May, but a slight increase was noted during ripening. On the contrary, seeds had total amounts of cyanogenic glycosides as high as 75-100mg/g dw throughout the season. Prunasin was predominant in young seeds but the content began to reduce in early June and became barely detectable in early July. On the other hand, amygdalin appeared in early June and then increased rapidly to the maximum level (100mg/g dw) in late June. Such a corresponding increase in amygdalin content with decreasing prunasin concentrations suggests the conversion of prunasin to amygdalin. β-Cyanoalanine synthase activity in the seed was considerably higher than in the flesh. The activity in the seed was kept consistent at early stages (5.6-7.6 μmol H2S/g fw/hr) but further increased in parallel with the increasing amygdalin concentrations to the maximum level as high as 100μmol H2S/g fw/hr.

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