Analysis of aberrant virulence of Gibberella zeae following transformation-mediated complementation of a trichothecene-deficient (Tri5) mutant

Article Abstract:

Trichothecene mycotoxins are implicated in the virulence property of Gibberella zeae affecting the wheat ears. Data reveal that the aberrant virulence of the trichothecene-producing complemented mutants is caused by non-target effects produced during the transformation process.

United States, Statistical Data Included, Infection, Virulence (Microbiology), Bacterial transformation, Wheat, Trichothecenes

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Linkage among genes responsible for fumonisin biosynthesis in Gibberella fujikuroi mating population A

Article Abstract:

The fum1, fum2, fum3 and fum4 genes that regulate the synthesis of fumonisin in Gibberella fujikuroi mating population A are closely linked to each other and form a gene cluster on chromosome 1. Genetic tests show that mutants that fail to produce the mycotoxin fumonisin B1 are unable to hydroxylate C-5 or C-10. The defect is due to mutations at the linked fum2 or fum3 loci. The map distance between fum1 and fum2 is 360 kb and that between fum1 and fum4 is 250 kb.

Microbiological synthesis, Mycotoxins, Linkage (Genetics)

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Restoration of wild-type virulence to Tri5 disruption mutants of Gibberella zeae via gene reversion and mutant complementation

Article Abstract:

Research suggests that Tri5 disruption mutants of the organism Gibberella zeae loose virulence through gene reversion and mutant complementation rather than gene transformation. Studies using a revertant from a Tri5 disruption mutant and a plasmid-transformed mutant suggest that trichothecenes production is related to plant-pathogenic fungi virology. B. zeae causes disease in numerous crops including maize, barley and wheat.

Agricultural pests

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