Effect of O3 Treatment on the Storage Quality and Resistance Enzyme Activity of Kiwifruit Treated with CPPU
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Abstract:
The inhibitory effect of ozone (O3) on the quality of kiwifruit treated with expanding agents (N-(2-chloro-4-pyridyl)-N’-phenylurea, CPPU) during the storage was investigated. The postharvest Qinmei kiwifruit in the growth phase was treated with 20 mg/L CPPU and reserved in 0 ± 1℃, and then treated with 10, 40 and 70 mg/m3 ozone. The quality index, ethylene release, respiration intensity and resistance enzyme activity were studied. The results showed that 40 mg/m3 O3 could slow down the quality decline of CPPU-treated kiwifruit and the rise of soluble solids content. Besides, it can reduce the drop of titratable acid and Vc contents, maintain good hardness, inhibit the release of ethylene and respiration rate, and increase the activity of Phenylalanine ammonia lyase (PAL), β-1,3-glucanase (GLU) and Chitinase (CHI), thus reducing the decay rate of Kiwifruit fruit. O3 treatment could effectively reduce the negative effects of CPPU on the fruit of kiwifruit, and thus could better prolong the storage period.
