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Scientia Silvae Sinicae ›› 2018, Vol. 54 ›› Issue (6): 53-62.doi: 10.11707/j.1001-7488.20180607

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The Effect of Galla chinensis extract on Postharvest Disease and Storage Quality of Blueberry

Sun Sha1,2, Gao Haiyan1, Xiong Tao2, Chen Hangjun1, Liu Ruiling1, Wu Weijie1   

  1. 1. Key Laboratory of Postharvest Handing of Fruits, Ministry of Agriculture Key Laboratory of Fruits and Vegetables Postharvest and Processing Technology Research of Zhejiang Province Key Laboratory of Postharvest of Fruits and Vegetables, China National Light Industry Food Science Institute, Zhejiang Academy of Agricultural Science Hangzhou 310021;
    2. The State Key Laboratory of Food Science and Technology Nanchang University Nanchang 330047
  • Received:2017-03-25 Revised:2018-04-25 Online:2018-06-25 Published:2018-07-02

Abstract: [Objective] Gray mold is one of the most serious diseases of postharvest blueberry, and it affects the storage quality of blueberry and its defense systems. The effects of Galla chinensis (Chinese nutgall) extract on the quality and the anti-oxidative system of blueberry infected with Botrytis cinerea were studied. The antibacterial mechanism of gallnut extract was also investigated to provide reference for postharvest storage and quality control of blueberry.[Method] In this study, ‘Legsi’ blueberry was used as the experimental material, the extract of gallnut with 75% ethanol (ethanol:water, V/V) were uniformly sprayed on the blueberry fruit surface (4 mL·g-1), according to the experimental grouping requirements. Then the treated blueberry was placed in an incubator of 25℃, and sampled continuously for 7 days (1 d interval). The indexes of blueberry quality, including rotting rate, weight loss rate, titratable acid content (TA), total soluble solids (TSS), electrical conductivity, and vitamin C, were analyzed. Moreover, the malondialdehyde (MDA), catalase (CAT), oxidase (PPO), and peroxidase (POD) were also measured to reflect the antibacterial effect of gallnut extract on B. cinerea. [Result] Results showed that the nutrition indexes, rotting rate and weight loss rate of blueberry fruits increased significantly with storage time. TA and TSS all decreased significantly (P<0.05). The deterioration of the nutrition index of the blueberry inoculated with B. cinerea was much faster than that of the blueberry treated with gallnut extract. The defense system of blueberry was activated by the infection of B. cinerea, and the enzyme activities of PPO, POD, and CAT increased to form a defense system that eliminates free radicals and diseases. However, due to serious diseases in the later period, the defense system of blueberry was disordered, and enzyme activities were declined. While gallnut extract treatment significantly improved the postharvest quality and boosted the defense system of blueberry against B. cinerea infection. The enzyme activities in gallnut extract treatment groups were always in a dynamic equilibrium system, with slight decline due to aging.[Conclusion] These results indicated that gallnut extract can effectively inhibit the growth of B. cinerea, and could be used as a new approach to control the postharvest quality of blueberry.

Key words: Galla chinensis, Botrytis cinerea, blueberry quality, antioxidant

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