title: Maize seedling blight induced by Fusarium verticillioides: accumulation of fumonisin B₁ in leaves without colonization of the leaves.
abstract: Fusarium verticillioides produces fumonisin mycotoxins during the colonization of maize, and fumonisin B₁ (FB₁) production is necessary for manifestation of maize seedling blight disease. The objective of this study was to address FB₁ mobility and accumulation in seedlings to determine if proximal infection by F. verticillioides is necessary for FB₁ accumulation. Taking advantage of an aconidial mutant known to have limited capability for seedling infection, tissue and soil samples were analyzed to compare wild-type F. verticillioides against the mutant. Inoculation with either strain caused accumulation of FB₁ in the first and second leaves, but the mutants were unable to colonize aerial tissues. FB₁, FB₂, and FB₃ were detected in the soil and seedling roots, but only FB₁ was detected in the leaves of any treatment. These data suggest root infection by F. verticillioides is necessary for accumulation of FB₁ in leaves, but the mechanism for accumulation does not require colonization of the leaf.
authors: Toxicology and Mycotoxin Research Unit, R. B. Russell Research Center, Agricultural Research Service, U.S. Department of Agriculture, 950 College Station Road, Athens, Georgia 30605, United States.
authors: Thomas T
authors: TT
authors: Baldwin
authors: Nicholas C
authors: NC
authors: Zitomer
authors: Trevor R
authors: TR
authors: Mitchell
authors: Anne-Marie
authors: AM
authors: Zimeri
authors: Charles W
authors: CW
authors: Bacon
authors: Ronald T
authors: RT
authors: Riley
authors: Anthony E
authors: AE
authors: Glenn
mesh_terms: D037341:Fumonisins / Q000378:metabolism*; D005670:Fusarium / Q000254:growth & development / Q000378:metabolism*; D010935:Plant Diseases / Q000382:microbiology*; D018515:Plant Leaves / Q000737:chemistry* / Q000254:growth & development / Q000382:microbiology; D036226:Seedlings / Q000737:chemistry / Q000254:growth & development / Q000382:microbiology; D003313:Zea mays / Q000737:chemistry / Q000254:growth & development / Q000382:microbiology*
chemical_list: D037341:Fumonisins; C056933:fumonisin B1