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Acta Horticulturae Sinica ›› 2024, Vol. 51 ›› Issue (1): 162-174.doi: 10.16420/j.issn.0513-353x.2023-0265

• Plant Protection • Previous Articles     Next Articles

Bacillus velezensis HY19 Volatile Organic Compounds as a Preservative in Postharvest Citrus Fruit Management

LI Suping1, LI Wei1, HAN Leng2, HUANG Jianguo1,*()   

  1. 1 College of Resources and Environment,Southwest University,Chongqing 400715,China
    2 Citrus Research Institute of Chinese Academy of Agricultural Sciences,Chongqing 400712,China
  • Received:2023-04-20 Revised:2023-08-13 Online:2024-01-25 Published:2024-01-16
  • Contact: (E-mail:huang99@swu.edu.cn

Abstract:

To evaluate the potential of Bacillus velezensis HY19 volatile organic compounds(VOCs)as a citrus fruit preservative,the suppression of HY19 and its VOCs on the main pathogens(Penicillium italicum and P. digitatum)of postharvest diseases of citrus fruit was studied through culture experiments in confrontation and bipartite plate. Qualitative and quantitative analysis of antifungal active substances in VOCs was conducted with gas chromatography-mass spectrometry(GC-MS). And the control efficiency of VOCs on post-harvest diseases of citrus fruit was studied through artificial inoculation tests and storage experiments at room temperature. The results showed that strain HY19 and its VOCs significantly inhibited the mycelial growth of P. italicum and P. digitatum. Eighteen antifungal substances were found in the VOCs,including 2-tridecanone,dibutyl phthalate,1-nonanol,benzoic acid,etc. The VOCs induced the activities of defense enzymes(SOD and POD)in citrus fruit peels,decreased the cell membrane permeability and malondialdehyde content,reduced the damage of pathogens to the peels,and improved the resistance of peels to diseases. The control efficacies of the VOCs against blue mold and green mold reached 59.65% and 64.11%,respectively. After 15 and 30 d of citrus fruit storage at room temperature,the VOCs considerably reduced the decay rate of citrus fruit,with the preservative efficacies of 57.04%(15 d)and 58.07%(30 d),respectively,and had no influence on fruit quality. In summary,B. velezensis HY19 had the potential to be developed as a preservative for postharvest citrus fruit.

Key words: citrus, Bacillus velezensis, volatile organic compounds, gas chromatography-mass spectrometry, bio-preservatives