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Mr. Jarl Vaerten
Soil Service of Belgium
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Academic Career Length
7Years (2020-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
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Journal Article
ASAnze Svara
Anze SvaraŁTŁukasz Paweł Tarkowski
Łukasz Paweł TarkowskiHRHenry Christopher Janse van Rensburg
Henry Christopher Janse van RensburgEDEvelien Deleye
Evelien DeleyeJVJarl Vaerten
Jarl Vaerten
Wim Van den Ende +2
There is an urgent need for novel, efficient and environmentally friendly strategies to control apple scab (Venturia inaequalis), for the purpose of reducing overall pesticide use. Fructans are recently emerging as promising “priming” compounds, standing out for their safety and low production costs. The objective of this work was to test a fructan-triggered defense in the leaves of apple seedlings. It was demonstrated that exogenous leaf spraying can reduce the development of apple scab disease symptoms. When evaluated macroscopically and by V. inaequalis-specific qPCR, levan-treated leaves showed a significant reduction of sporulation and V. inaequalis DNA in comparison to mock- and inulin-treated leaves, comparable to the levels in fosetyl-aluminum-treated leaves. Furthermore, we observed a significant reduction of in vitro mycelial growth of V. inaequalis on plates supplemented with levans when compared to controls, indicating a direct inhibition of fungal growth. Variations in endogenous sugar contents in the leaves were followed during priming and subsequent infection, revealing complex dynamics as a function of time and leaf ontogeny. Our data are discussed in view of the present theories on sugar signaling and fructan-based immunity, identifying areas for future research and highlighting the potential use of fructans in apple scab management in orchards.
About Me
Research engineer (2018 - present)
Soil Service of Belgium
W. de Croylaan, 3001 Heverlee (Belgium)
www.bdb.be
▪ responsible for the following up of various projects and studies on soil and water management (incl. project and report writing, follow-up of trials and lab analyses, data analysis, scientific articles,
participation in congresses, meetings, …).
▫ current focuson: irrigation, soil water management, soil quality and plant production
▪ irrigation consultant for arable farming and vegetable cultivation within the "irrigation management" service
Lead author on publication:
Vaerten J., Janssens P., Elsen A., Elsen F., Vandendriessche H. 2019. 30 jaar irrigatieproeven bij de
Bodemkundige Dienst van België. Publicatie van de Bodemkundige Dienst van België. 102 pp.
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Master in Bioscience Engineering in Agriculture (2017), KULeuven, Leuven, BE
Major: Agriculture - Crop production
Minor: Agro- and Ecosystems Engineering
Master thesis:
‘Sweet immunity’: the effect of exogenous sugars on the susceptibility of apple plants to the fungus Venturia inaequalis.
It is known that some sugars can induce plant defense mechanisms which prime the plant against future attacks. In my thesis this concept was tested against apple scab.
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More info @ https://www.linkedin.com/in/jarlvaerten/