1887

Abstract

Fusaric acid (FA) is a key component in virulence and symptom development in cotton during infection by . A putative major facilitator superfamily (MFS) transporter gene was identified downstream of the polyketide synthase gene responsible for the biosynthesis of FA in a region previously believed to be unrelated to the known FA gene cluster. Disruption of the transporter gene, designated , resulted in loss of FA secretion, decrease in FA production and a decrease in resistance to high concentrations of FA. Uptake of exogenous FA was unaffected in the disruption transformants, suggesting that FA enters the cell in by an independent mechanism. Thus, is involved both in the extracellular transport of FA and in resistance of to this non-specific toxin. A potential secondary resistance mechanism, the production of FA derivatives, was observed in deletion mutants. Molecular analysis of key biochemical processes in the production of FA could lead to future host plant resistance to pathogens.

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2015-04-01
2022-01-18
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