外源水杨酸处理对采后蓝莓果实苯丙烷代谢的影响

摘要

为了解外源水杨酸处理对采后蓝莓果实苯丙烷代谢系统的影响及其作用机制,采用0.5mmol/L和1.0mmol/L的水杨酸对蓝莓果实进行浸泡处理,然后装入聚乙烯薄膜袋后松扎口,贮藏在1℃下.贮藏期间分析测定了蓝莓果实的感官品质、呼吸速率以及参与苯丙烷代谢的苯丙氨酸解氨酶(PAL)、多酚氧化酶(PPO)、过氧化物酶(POD)等酶活性和木质素含量等指标.结果表明,0.5mmol/L和1.0mmol/L的外源水杨酸处理均可促进蓝莓果实苯丙烷代谢的进程,从而使苯丙烷代谢的终产物-木质素的含量增加,进而增加了果实硬度并可有效地抵御微生物的入侵,减少果实腐烂,延长保质期.%In order to explore the effect of exogenous salicylic acid treatment on phenylproanoid metabolic system of postharvest blueberry fruits and its mechanism,fresh blueberry fruits were dipped in salicylic acid solution of 0.5mmol/L and 1 .0mmol/L, respectively. Then fruits were moved into a polyethylene film bag with a slackened tie storage at 1℃. During the period of storage,fruit sensory quality,respiration rate,rot rate, firmness and lignin content were measured. Meanwhile,activities of phenylalnine ammonialyase (PAL), polyphenol oxidase(PPO) and peroxidase (POD) that related to phenylproanoid metabolic were analyzed. The result indicated that exogenous salicylic acid treatments accelerated the process of phenylproanoid metabolism of postharvest blueberry fruits. Therefore,the end product of phenylpropanoid metabolism, lignin content increased and it increased the fruit firmness.