Screening, Identification, and Fermentation of a Biocontrol Strain against Peony Southern Blight and Extraction of Secondary Metabolites

Peng Song (), Zele Wang, Xingxin Sun, Yinglong He, Wenjing Zhang, Yunqi Yang and Pengyu Zhao
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Peng Song: College of Agriculture, Henan University of Science and Technology, Luoyang 471000, China
Zele Wang: College of Agriculture, Henan University of Science and Technology, Luoyang 471000, China
Xingxin Sun: College of Agriculture, Henan University of Science and Technology, Luoyang 471000, China
Yinglong He: College of Agriculture, Henan University of Science and Technology, Luoyang 471000, China
Wenjing Zhang: College of Agriculture, Henan University of Science and Technology, Luoyang 471000, China
Yunqi Yang: College of Agriculture, Henan University of Science and Technology, Luoyang 471000, China
Pengyu Zhao: College of Agriculture, Henan University of Science and Technology, Luoyang 471000, China

Agriculture, 2024, vol. 14, issue 6, 1-26

Abstract: A bacterial strain (WM-37) was isolated from soil and identified as Streptomyces rectiviolaceus on the basis of morphological, physiological, biochemical, and 16S rRNA characteristics. The strain was screened regarding its potential use for controlling the pathogen causing peony southern blight. To enhance the secondary metabolite yield, submerged fermentation was conducted according to a single-factor trial and response surface method. Metabolite production peaked under the following conditions: 250.00 mL flask containing 100.00 mL culture medium consisting of 20.00 g·L −1 soluble starch, 3.86 g·L −1 ammonium sulfate, 0.50 g·L −1 sodium chloride, 0.50 g·L −1 dipotassium phosphate, 0.50 g·L −1 magnesium sulfate, and 0.01 g·L −1 ferrous sulfate; inoculation amount, 7.74%; temperature, 30 °C; initial pH, 7.00; incubation time, 7 days; and rotational speed, 160 rpm. The fermentation broth was absorbed by D101 macroporous resin and eluted with an ethanol-water gradient, after which the eluate fractions with antifungal compounds were collected, evaporated, and concentrated to obtain a crude extract. This extract was dissolved in methanol and separated by high-performance liquid chromatography. The active compound was identified as azelaic acid (C 9 H 16 O 4 ) on the basis of ultra-high-resolution mass spectrometry and analyses of publicly available data. These findings suggest that Streptomyces rectiviolaceus WM-37 may be a viable biocontrol agent effective against the pathogen responsible for peony southern blight.

Keywords: peony southern blight; biocontrol strain; fermentation optimization; antifungal substances; isolation and identification; azelaic acid (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2024
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