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

SILVINA L. ARIAS; VERÓNICA S. MARY; SANTIAGO N. OTAIZA; DANIEL A. WUNDERLIN; HÉCTOR R. RUBINSTEIN; MARTÍN G. THEUMER

PHYTOCHEMISTRY

PERGAMON-ELSEVIER SCIENCE LTD

Lugar: Amsterdam; Año: 2016 vol. 125 p. 54 - 54

0031-9422

usarium verticillioides is a major maize pathogen and there are susceptible and resistant cultivars to thisfungal infection. Recent studies suggest that its main mycotoxin fumonisin B1 (FB1) may be involved inphytopathogenicity, but the underlying mechanisms are mostly still unknown. This work was aimed atassessing whether FB1 disseminates inside the plants, as well as identifying possible correlationsbetween the maize resistant/susceptible phenotype and the unbalances of the FB1-structurally-relatedsphingoid 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. verticillioidesand from uninoculated ones irrigated with FB1 (20 ppm), were harvested at 7, 14 and 21 daysafter planting (dap), and the FB1, Sa and Pso levels were quantified in roots and aerial parts. The toxinwas detected in roots and aerial parts for inoculated and FB1-irrigated plants of both h