摘要
为从宏观电学特性方面探究采后O_3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/m~3 O_3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+O_3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O_3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+O_3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O_3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。
In order to investigate whether postharvest O_3 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/m~3 O_3 for 2 hours every 15 days during postharvest storage at(0 ± 1) ℃ and relative humidity of 90%–95%. The results showed that CPPU + O_3 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 O_3 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 + O_3 treated kiwifruit was 3 980 kHz, which further indicates that O_3 can weaken the negative effect of CPPU treatment on kiwifruit through macroscopic electrical characteristics.
引文
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