Pathogenic Fusarium oxysporum f. sp. cepae growing inside onion bulbs emits volatile organic compounds that correlate with the extent of infection

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Wang , A , Islam , M N , Johansen , A , Haapalainen , M , Latvala , S & Edelenbos , M 2019 , ' Pathogenic Fusarium oxysporum f. sp. cepae growing inside onion bulbs emits volatile organic compounds that correlate with the extent of infection ' , Postharvest Biology and Technology , vol. 152 , pp. 19-28 . https://doi.org/10.1016/j.postharvbio.2019.02.010

Title: Pathogenic Fusarium oxysporum f. sp. cepae growing inside onion bulbs emits volatile organic compounds that correlate with the extent of infection
Author: Wang, Aimei; Islam, Md Nahidul; Johansen, Anders; Haapalainen, Minna; Latvala, Satu; Edelenbos, Merete
Contributor: University of Helsinki, Department of Agricultural Sciences
Date: 2019-06
Language: eng
Number of pages: 10
Belongs to series: Postharvest Biology and Technology
ISSN: 0925-5214
URI: http://hdl.handle.net/10138/327098
Abstract: Diseases develop during the storage of onions. To minimize losses, new methods are needed to identify diseased bulbs early in storage. Volatile organic compounds (VOCs), the respiration rate, weight loss, and the dry matter content were investigated for 1-7 weeks post inoculation of bulbs with water (control) and two strains (Fox006 or Fox260) of Fusarium oxysporum f. sp. cepae. Photos, multispectral image analysis, and real-time polymerase chain reaction (PCR) showed no infection in the control onions, weak pathogenic infection in Fox006-onions, and strong pathogenic infection in Fox260-onions at week 7 post inoculation. Infected bulbs exhibited increased respiration rate, increased VOC emission rate, and increased weight loss. The control and Fox006-onions did not respond to inoculation and had similar reaction pattern. Forty-three different VOCs were measured, of which 17 compounds had sulfur in their chemical structure. 1-Propanethiol, methyl propyl sulfide, and styrene were emitted in high concentrations and were positively correlated with the extent of infection (r = 0.82 - 0.89). Therefore, these compounds were the most promising volatile markers of Fusarium basal rot infection. For the first time, we show that the extent of fungal infection determined by real-time PCR in onion bulbs is related with VOC emission.
Subject: Allium cepa L.
Food spoilage
SPME
Image analysis
Real-time PCR
Respiration rate
DISCRIMINANT-ANALYSIS
PROLIFERATUM
QUALITY
1183 Plant biology, microbiology, virology
416 Food Science
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