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香蕉果实采收后果肉中腐胺(PUT)含量随贮放时间的延长而逐渐下降,在果实出现乙烯高峰后又明显增加。果实采后初期亚精胺(SPD)、精胺(SPM)含量逐渐增加,果实出现乙烯高峰后,精胺明显积累,但亚精胺的变化较小。果皮中精胺的变化与果肉中的相似,但腐胺、亚精胺的变化则不同。精氨酸脱羧酶(ADC)和鸟氨酸脱羧酶(ODC)在果实采后初期活性较高,果实明显衰老时活性迅速降低。果肉中S—腺苷甲硫氨酸脱羧酶(SAMDC)活性先有增加,然后下降;而果皮中SAMDC则呈下降趋势。1——氨基环丙烷—1—羧酸合成酶(ACCS)变化与SAMDC不同,酶活性最高值较乙烯高峰提前二天到达。S—腺苷甲硫氨酸(SAM)在乙烯高峰出现时含量明显下降。结果认为,多胺对果实后熟、衰老的调节机理不但与竞争SAM有关,还与代谢平衡有关。
The content of putrescine (PUT) in banana fruit decreased gradually with the prolongation of storage time, and then increased significantly after the peak of ethylene in fruit. The content of spermidine (SPD) and spermine (SPM) increased gradually in the early fruit postharvest period, and the spermine was obviously accumulated after the peak of ethylene in fruit, but the change of spermidine was small. Changes in spermine spermatozoa and pulp similar, but the changes of putrescine, spermidine are different. The activities of arginine decarboxylase (ADC) and ornithine decarboxylase (ODC) were higher in the initial stage of postharvest fruits, and their activity decreased rapidly when the fruits were significantly aged. The activity of S-adenosylmethionine decarboxylase (SAMDC) in the pulp first increased and then decreased, while the SAMDC in the peel decreased. The change of 1-aminocyclopropane-1-carboxylic acid synthase (ACCS) is different from that of SAMDC, and the peak value of enzyme activity arrives two days earlier than the peak of ethylene. S-adenosylmethionine (SAM) significantly decreased at the peak of ethylene. The results showed that polyamines on the ripening of fruits, aging regulation mechanism not only with competition SAM, but also with the metabolic balance.