Canadian Journal of Microbiology - Revue Canadienne de Microbiologie (2017) 63, 921-927

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Kun Luo, Caro-Lyne DesRoches, Anne Johnston, Linda J. Harris, Hui-Yan Zhao and Thérèse Ouellet (2017)
Multiple metabolic pathways for metabolism of l-tryptophan in Fusarium graminearum
Canadian Journal of Microbiology - Revue Canadienne de Microbiologie 63 (11), 921-927
Abstract: Fusarium graminearum is a plant pathogen that can cause the devastating cereal grain disease fusarium head blight in temperate regions of the world. Previous studies have shown that F. graminearum can synthetize indole-3-acetic acid (auxin) using l-tryptophan (L-TRP)-dependent pathways. In the present study, we have taken a broader approach to examine the metabolism of L-TRP in F. graminearum liquid culture. Our results showed that F. graminearum was able to transiently produce the indole tryptophol when supplied with L-TRP. Comparative gene expression profiling between L-TRP-treated and control cultures showed that L-TRP treatment induced the upregulation of a series of genes with predicted function in the metabolism of L-TRP via anthranilic acid and catechol towards the tricarboxylic acid cycle. It is proposed that this metabolic activity provides extra energy for 15-acetyldeoxynivalenol production, as observed in our experiments. This is the first report of the use of L-TRP to increase energy resources in a Fusarium species.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Linda J. Harris

Research topic(s) for pests/diseases/weeds:
molecular biology - genes


Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Fusarium graminearum