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Volatile Organic Compounds Produced by Pseudomonas chlororaphis subsp. aureofaciens SPS-41 as Biological Fumigants To Control Ceratocystis fimbriata in Postharvest Sweet Potatoes

Zhang, Yu, Li, Tengjie, Liu, Yuanfang, Li, Xiaoyan, Zhang, Chunmei, Feng, Zhaozhong, Peng, Xue, Li, Zongyun, Qin, Sheng, Xing, Ke
Journal of agricultural and food chemistry 2019 v.67 no.13 pp. 3702-3710
Ceratocystis fimbriata, Pseudomonas chlororaphis, antifungal properties, biological control, chemical composition, disease severity, fumigants, microscopy, mycelium, phenylethyl alcohol, plant pathogenic fungi, roots, spore germination, sweet potatoes, tubers, volatile organic compounds, weight loss
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.