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Acta Horticulturae Sinica ›› 2025, Vol. 52 ›› Issue (3): 761-772.doi: 10.16420/j.issn.0513-353x.2024-0329

• Plant Protection • Previous Articles     Next Articles

Antifungal Mechanism of Isooctyl Alcohol on Botrytis cinerea Causing Tomato Gray Mold

WANG Chunwei, WANG Yan, DUAN Tiankun, SU Yaxin, YUAN Shengnan, REN Lu, ZHAO Xiaojun, WANG Meiqin*()   

  1. College of Plant Protection,Shanxi Agricultural University,Taigu,Shanxi 030801,China
  • Received:2024-11-06 Revised:2024-12-09 Online:2025-03-25 Published:2025-03-25
  • Contact: WANG Meiqin

Abstract:

Previous findings showed that isooctyl alcohol could effectively inhibit Botrytis cinerea mycelial growth. To clarify the antifungal mechanism of isooctyl alcohol on Botrytis cinerea,the inhibition effects of isooctyl alcohol on mycelia growth,spore germination and sclerotium growth were detected by using two-sealed-base-plate method. After treatment of isooctyl alcohol,the DNA content and reactive oxygen species in B. cinerea were detected by using a laser scanning confocal microscope. The effects of isooctyl alcohol on the mycelase activity and oxalic acid production were measured using ultraviolet spectrophotometry. The control effect of isoctyl alcohol on tomato gray mold was conducted. The effects of isoctyl alcohol on the activities of defense enzymes were further detected. The results showed that isoctyl alcohol had significant inhibition effects on the mycelial growth. After treatment with isooctyl alcohol at the concentration of 20 μL · L-1,spore germination was completely inhibited with the inhibition rate of 100%,and sclerotium was also significantly inhibited. Fluorescence intensity of DNA content in B. cinerea was dramatically reduced with the increase of reactive oxygen species level. The activities of superoxide dismutase(SOD),catalase(CAT),polygalacturonase(PG),β-1,3-glucanase(β-1,3-GA)and chitinase(CHI)were all decreased in B. cinerea. Oxalic acid(OA),an important virulence factor,was inhibited significantly in B. cinerea. In addition,the control effect of isooctyl alcohol on tomato gray mold was 77.19%. Isooctyl alcohol also enhanced SOD,CAT,CHI,peroxidase(POD)and phenylalanine aminolyase(PAL)activities in tomato. Therefore,isooctyl alcohol could effectively inhibit B. cinerea growth by interfering in the normal physiological activity,and also induce resistance to B. cinerea in tomato fruit.

Key words: tomato, isooctyl alcohol, Botrytis cinerea, antifungal effect, defense enzyme