Acta Horticulturae Sinica ›› 2023, Vol. 50 ›› Issue (1): 145-152.doi: 10.16420/j.issn.0513-353x.2021-0982

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Antifungal Mechanisms of Sodium New Houttuyfonate Against Penicillium digitatum

DU Yuling, YANG Fan, ZHAO Juan, LIU Shuqi, LONG Chaoan*()   

  1. National Key Laboratory for Germplasm Innovation & Utilization of Horticultural Crops,Key Laboratory of Horticultural Plant Biology Ministry of Education,National Citrus Preservation Technology R & D Center,College of Horticultural & Forestry Sciences,Huazhong Agricultural University,Wuhan 430070,China
  • Received:2022-08-26 Revised:2022-11-15 Online:2023-01-25 Published:2023-01-18
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In order to explore the antifungal mechanisms of Sodium New Houttuyfonate(SNH)against Penicillium digitatumin vitro and in vivo experiments were conducted. The results showed that the minimum inhibitory concentration and minimum fungicidal concentration of SNH were 1 and 2 mmol · L-1 respectively;with the increase of SNH concentration,the spore germination rate of P. digitatum decreased significantly and the relative conductivity increased significantly. The results of transmission electron microscope showed that 1 mmol · L-1 treatment could destroy the cell structure of P. digitatum,resulting in the dissolution of cytoplasmic components,the disappearance of mitochondrial structure and the separation of plasma wall. At the same time,1 mmol · L-1 SNH can inhibit the growth of a variety of citrus fungal diseases,showing broad-spectrum antifungal activity. When the fruits were artificially inoculated with 5 and 10 mmol · L-1 SNH + Penicillium digitatum spore mixture,the lesion diameter of summer orange was significantly smaller than that of the control group. The above results showed that SNH could significantly inhibit the growth of P. digitatum,and had the prospect of control citrus green mold.

Key words: citrus, postharvest, green mold, biological control, Sodium New Houttuyfonate, Penicillium digitatum, antifungal mechanism

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