Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 67, Issue 13, Pages 3702-3710Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.9b00289
Keywords
volatile organic compounds; Pseudomonas chlororaphis; antifungal; microbial fumigant; sweet potato
Funding
- National Natural Science Foundation of China [31101502]
- Natural Science Foundation of the Jiangsu Higher Education Institutions of China [17KJA180004]
- China Agriculture Research System [CARS-10-B03]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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The biocontrol activity and chemical composition of the volatile organic compounds (VOCs) produced by Pseudomonas chlororaphis subsp. aureofaciens SPS-41 were investigated. The VOCs inhibited mycelial growth and spore germination in Ceratocystis fimbriata, which causes black rot disease in sweet potato tuber roots (TRs) and showed wide-spectrum antifungal activity against several plant pathogenic fungi. A microscopic examination of C. fimbriata cells suggested morphological changes and a loss of cellular contents. Different inoculation strategies significantly affected the antifungal activity of the VOCs. In the volatile profile of SPS-41, the most abundant compound, 3-methyl-1-butanol, followed by phenylethyl alcohol and 2-methyl-1-butanol showed strong inhibition toward C. fimbriata. The weight loss rate and disease severity of the TRs were significantly reduced in response to the VOCs emitted by SPS-41. The results suggest that the VOCs produced by P. chlororaphis subsp. aureofaciens SPS-41 might constitute an attractive biological fumigant for controlling black rot disease in sweet potato TRs.
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