Toxin distribution and sphingoid base imbalances in Fusarium verticillioides-infected and fumonisin B1-watered maize seedlings

Phytochemistry
Silvina L AriasMartin G Theumer

Abstract

Fusarium verticillioides is a major maize pathogen and there are susceptible and resistant cultivars to this fungal infection. Recent studies suggest that its main mycotoxin fumonisin B1 (FB1) may be involved in phytopathogenicity, but the underlying mechanisms are mostly still unknown. This work was aimed at assessing whether FB1 disseminates inside the plants, as well as identifying possible correlations between the maize resistant/susceptible phenotype and the unbalances of the FB1-structurally-related sphingoid base sphinganine (Sa) and phytosphingosine (Pso) due to toxin accumulation. Resistant (RH) and susceptible hybrid (SH) maize seedlings grown from seeds inoculated with a FB1-producer F. verticillioides and from uninoculated ones irrigated with FB1 (20 ppm), were harvested at 7, 14 and 21 days after planting (dap), and the FB1, Sa and Pso levels were quantified in roots and aerial parts. The toxin was detected in roots and aerial parts for inoculated and FB1-irrigated plants of both hybrids. However, FB1 levels were overall higher in SH seedlings regardless of the treatment (infection or watering). Sa levels increased substantially in RH lines, peaking at 54-fold in infected roots at 14 dap. In contrast, the main chan...Continue Reading

References

Feb 1, 1992·Mycopathologia·P E Nelson
Jun 13, 2002·Journal of Agricultural and Food Chemistry·Adriana P AlmeidaBenedito Corrêa
Nov 26, 2002·The Plant Journal : for Cell and Molecular Biology·Stefka D SpassievaJacques Hille
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May 29, 2012·Frontiers in Plant Science·Robert BerkeyShunyuan Xiao
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Mar 19, 2013·Current Opinion in Plant Biology·Jonathan E MarkhamEdgar B Cahoon
Apr 29, 2015·The Science of the Total Environment·Agnieszka WaśkiewiczPiotr Goliński

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