外源腐胺对油桃采后生理及与其相关酶活性的影响

Effect of Exogenous Putrescine (Put) on Postharvest Physiology and Its Related Enzyme Activity of Nectarine [Prunus persica (L.) Batsch var.nectarina Maxim.]

研究外源腐胺(Put)对油桃品种‘秦光2号’果实采后生理及与其相关酶活性影响的结果表明:在0℃贮藏条件下Put处理的油桃冷害比未经Put处理的延迟10d发生,冷害发生率和冷害指数下降,超氧化物歧化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT)的活性均提高,脂氧合酶(LOX)活性受抑,果实的乙烯释放量和呼吸速率下降,二者跃变高峰出现推迟,果实硬度下降延缓,可溶性固形物(TSS)含量保持在较高水平,但Put对油桃中可滴定酸(TA)含量影响不显著。

In this paper, the effect of exogenous putrescine （Put） on chilling injury rate, chilling injury index, flesh firmness, total soluble solids （TSS）, titratable acidity （TA）, respiration, ethylene production, and activities of superoxide dismutase （SOD）, peroxidase （POD）, catalase （CAT） and lipoxygenase （LOX） of the nectarine （Prunus persica var. nectarina） variety ＇Qinguang 2＇ were studied. The results showed that the chilling injury of nectarine fruits stored at 0 ℃ was delayed for 10 d by exogenous Put treatment, the chilling injury rate and chilling injury index were different from control. Put significantly raised the activities of membrane SOD, CAT and POD and inhibited the LOX activity, meantime, the Put decreased the ethylene production and the respiration rate, delayed the respiration peak and the ethylene peak, slowed down the decrease in the flesh firmness, and made the content of TSS at a high level. However, it showed no remarkable effect on the contents of TA.