氯吡苯脲和O3处理‘秦美’猕猴桃采后生理品质与电学特性的关系

为从宏观电学特性方面探究采后O3处理是否可以减轻采前氯吡苯脲（1-(2-chloropyridin-4-yl)-3-phenylurea，CPPU）处理对‘秦美’猕猴桃产生的负面影响，以盛花期后28 d使用20 mg/L CPPU蘸果处理，采后贮藏过程中每隔15 d用70 mg/m3 O3处理2 h的秦美猕猴桃为试材，在（0±1）℃、相对湿度90%～95%条件下贮藏，研究贮藏期间生理指标、品质指标与电学特性之间的关系。结果表明：CPPU＋O3处理组过氧化氢酶活力、VC含量、可滴定酸质量分数整体高于CPPU处理组，呼吸速率、多聚半乳糖醛酸酶、纤维素酶活力低于CPPU处理组，采后O3处理可减轻CPPU对猕猴桃产生的负面影响。在选定的24 个频率中，CPPU处理的猕猴桃特征频率为0.1 kHz，对照组和CPPU＋O3处理的猕猴桃特征频率均为3 980 kHz。通过宏观电学特性判断，采后O3处理能减轻采前CPPU处理对‘秦美’猕猴桃品质和生理方面产生的负面影响。

Relationship between Postharvest Physiology,Quality and Electrical Properties of Kiwifruit Treated Preharvest with 1-(2-Chloropyridin-4-yl)-3-phenylurea and Postharvest with Ozone

In order to investigate whether postharvest O3 treatment can counteract the negative effect of preharvest 1-(2-chloropyridin-4-yl)-3-phenylurea (CPPU) treatment on kiwifruits based on macroscopic electrical properties, the relationship between postharvest physiology, quality and electrical properties was studied on ‘Qinmei’ kiwifruit treated with 20 mg/L CPPU at 28 days after flowering and then treated with 70 mg/m3 O3 for 2 hours every 15 days during postharvest storage at (0 ± 1) ℃ and relative humidity of 90%–95% . The results showed that CPPU + O3 treatment led to significantly higher catalase (CAT) activity, VC and titratable acid (TA) content and significantly lower respiratory rate, polygalacturonase (PG) and cellulase (Cx) activities than did CPPU treatment alone. Postharvest O3 treatment could weaken the negative effect of CPPU treatment on kiwifruit. The characteristic frequency for CPPU-treated kiwifruit was 0.1 kHz among the selected 24 frequencies, while the characteristic frequency for both control and CPPU + O3 treated kiwifruit was 3 980 kHz, which further indicates that O3 can weaken the negative effect of CPPU treatment on kiwifruit through macroscopic electrical characteristics.